================================================================================
AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 2, 2000
                                                  COMMISSION FILE NO.: 333-60405
================================================================================

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549

                                 ---------------
                         POST-EFFECTIVE AMENDMENT NO. 4
                                   TO FORM S-2
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                              ---------------------

                        IMAGING DIAGNOSTIC SYSTEMS, INC.
             (Exact Name of Registrant As Specified In Its Charter)

       Florida                        3845                    22-2671269
(State of Incorporation) (Primary Standard Industrial (IRS Employer I.D. Number)
                          Classification Code Number)

                               6531 NW 18TH COURT
                            PLANTATION, FLORIDA 33313
                                 (954) 581-9800

                       -----------------------------------
          (Address, including zip code and telephone number, including
             area code of registrant's principal executive offices)

                           Linda B. Grable, President
                        IMAGING DIAGNOSTIC SYSTEMS, INC.
                               6531 NW 18TH COURT
                            PLANTATION, FLORIDA 33313
                                 (954) 581-9800
            (Name, address and telephone number of Agent for Service)

                                    Copy to:
                         Christopher S. Auguste, Esquire
                                Parker Chapin LLP
                              405 Lexington Avenue
                                    9th Floor
                            New York, New York 10174
                               Tel: (212) 704-6000
                               Fax: (212) 704-6288

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to
time, at the discretion of the selling shareholders after the effective date of
this Registration Statement.

If any of the securities being registered on this form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

If the registrant elects to deliver its latest Form 10-KSB, as amended, to
security holders or a complete and legible facsimile thereof, pursuant to Item
11.(a)(1) of this Form, check the following box. [X]

If the registrant elects to deliver its latest Form 10-QSB, as amended, to the
security holder or a complete and legible facsimile thereof, pursuant to Item
11.(a)(2)(ii) of this Form, check the following box. [X]

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the same
offering. [_]



                         Calculation Of Registration Fee



TITLE OF SECURITIES BEING REGISTERED       AMOUNT TO BE     PROPOSED MAXIMUM     PROPOSED MAXIMUM     AMOUNT OF
                                           REGISTERED       OFFERING PRICE PER   AGGREGATE            REGISTRATION
                                                            SHARE (1)            OFFERING PRICE (1)   FEE
                                                                                                
COMMON STOCK, NO PAR VALUE                    5,349,458           $.2969           $1,588,254.08         $ 481.29
COMMON STOCK, NO PAR, ISSUABLE UPON
CONVERSION OF THE SERIES B PREFERRED
STOCK (2)(3)                                 16,016,427           $.2969           $4,755,277.18        $1,440.99
COMMON STOCK, NO PAR, ISSUABLE UPON
CONVERSION OF THE SERIES G PREFERRED
STOCK (2)(3)                                  1,801,803           $.2969             $534,955.31         $ 162.11
COMMON STOCK, NO PAR, ISSUABLE UPON
CONVERSION OF THE SERIES H PREFERRED
STOCK (2)(3)                                  3,038,020           $.2969             $901,988.14         $ 273.33
COMMON STOCK, NO PAR, ISSUABLE UPON
CONVERSION OF THE SERIES I PREFERRED
STOCK (2)(3)                                  5,947,763           $.2969           $1,765,890.83         $ 532.12
COMMON STOCK, NO PAR, ISSUABLE UPON
CONVERSION OF THE CONVERTIBLE
DEBENTURE (2)(3)                              4,740,971           $.2969           $1,407,594.29         $ 426.54
COMMON STOCK, NO PAR VALUE, ISSUABLE
UPON EXERCISE OF WARRANTS (2)(3)                190,625           $.2969              $56,596.56          $ 17.15
        TOTAL (4) (5)                        37,085,067           $.2969          $11,010,556.39        $3,336.53


(1) Estimated solely for purposes of calculating the registration fee according
to Rule 457(c) of the Securities Act of 1933, as amended, on the basis of the
average bid and ask price of our common stock on the NASDAQ Electronic Bulletin
Board on July 27, 1999.
(2) According to Rule 416 contained in the Securities Act of 1933, as amended,
this Registration Statement also covers such indeterminable additional shares of
common stock as may be issuable, as a result of any future anti-dilution
adjustments made in accordance with the terms of our Series B, G, H and I
convertible preferred stock and the warrants. In the event that the shares
registered in this prospectus are insufficient to meet the conversion
requirement at the actual time of conversion, we will file a new registration
statement to register the additional shares.
(3) According to the amended terms of the Registration Rights Agreement between
us and the Series H preferred holder, and the Registration Rights Agreements
with the Series B, G, I and the debenture holders, the amount being registered
is 100% of the number of shares that would be required to be issued if the
preferred stock and debentures were converted on the day before the filing of
the Registration Statement.
(4)All of the shares of common stock registered in this prospectus will be sold
by the selling security holders. In the event that the shares registered in this
prospectus are insufficient to meet the conversion requirement at the actual
time of conversion, we will file a new registration statement to register the
additional shares.
(5) A filing fee of $4,283.70 was paid in connection with the initial filing of
the Registration Statement and Amendment No. 2.

WE WILL AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE
NECESSARY WHICH MAY DELAY ITS EFFECTIVE DATE UNTIL WE FILE A FURTHER AMENDMENT
WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL THEREAFTER
BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE SECURITIES ACT OF 1933
OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE
COMMISSION, ACTING ACCORDING TO SECTION 8(A), MAY DETERMINE.



The information in this prospectus is not complete and may be changed. These
securities may not be sold until the registration statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to sell these securities and is not seeking an offer to buy these securities in
any state where the offer or sale is not permitted.

                SUBJECT TO COMPLETION, DATED _____________, 2000

                                   PROSPECTUS

                        IMAGING DIAGNOSTIC SYSTEMS, INC.

                        37,085,067 shares of common stock

o         The  shares of common stock offered by this prospectus are being sold
          by the stockholders listed in the section of this prospectus called
          "selling stockholders". We will not receive any proceeds from the sale
          of these shares. We could receive up to $732,724 in proceeds from the
          exercise of 190,625 warrants, the underlying shares of which we are
          registering in this prospectus, by the selling stockholders, which
          proceeds would be used for general corporate purposes. As of the date
          of this prospectus, none of these warrants have been exercised.

o         Our  common stock is traded on the OTC Bulletin Board under the symbol
          "IMDS".

o         On February 28, 2000, the closing bid price of our common stock on
          the OTC Bulletin Board was $3.8438.


         The securities offered in this prospectus involve a high degree of
risk. You should carefully consider the factors described under the heading
"Risk Factors" beginning on page 5 of this prospectus.

               --------------------------------------------------


         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities, or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

               --------------------------------------------------



                 The date of this prospectus is __________, 2000





                                Table Of Contents
                                                                                          
Forward-Looking Statements.....................................................................3

Prospectus Summary.............................................................................3


Recent Developments............................................................................4

The Offering...................................................................................5

Risk Factors...................................................................................6

Where You Can Find More Information...........................................................18

Incorporation of Certain Documents by Reference...............................................18

Information With Respect to the Registrant....................................................19

Management's Discussion and Analysis of Financial Condition and Results of Operation..........19

Material Changes..............................................................................20

Summary of Compensation Table.................................................................20

Option/SAR Grants in Last Fiscal Year.........................................................20

Security Ownership of Certain Beneficial Owners and Management................................21

Certain Relationships and Related Transactions................................................22

Sale of Unregistered Securities...............................................................23

Price Range of Common Stock...................................................................31

Dividend Policy...............................................................................31

Selling Security Holders......................................................................32

Use of Proceeds...............................................................................34

Plan of Distribution..........................................................................34

Description of Securities.....................................................................35

Disclosure of Commission Position on Indemnification for Securities and Liabilities...........36

Experts  .....................................................................................36

Legal Opinion.................................................................................36

Financial Information.........................................................................36



                                       2


                           Forward-Looking Statements

This prospectus contains some forward-looking statements that involve
substantial risks and uncertainties. These forward-looking statements can
generally be identified by the use of forward-looking words like "may," "will,"
"except," "anticipate," "intend," "estimate," "continue," "believe" or other
similar words. Similarly, statements that describe our future expectations,
objectives and goals or contain projections of our future results of operations
or financial condition are also forward-looking statements. Our future results,
performance or achievements could differ materially from those expressed or
implied in these forward-looking statements as a result of certain factors,
including those listed under the heading "Risk Factors" and in other cautionary
statements in this prospectus.

                               Prospectus Summary

         This summary highlights information in this document. You should
carefully review the more detailed information and financial statements included
in this document. The summary is not complete and may not contain all of the
information you may need to consider before investing in our common stock. We
urge you to carefully read this document, including the "Risk Factors" and the
financial statements and their accompanying notes.

                                   The Company


We are a medical technology company that has developed and is testing Computed
Tomography Laser Mammography (CTLM(TM)) for detecting breast cancer through the
skin in a non-invasive procedure. The CTLM(TM) employs a laser and proprietary
scanning technology to produce visual images of the breast, which may be used to
detect and analyze tissue for indicia of malignancy or benignancy. The
components of the laser system are purchased from two unrelated parties and
assembled and installed into the CTLM(TM) by us. The CTLM(TM) will be used as an
adjunct to traditional breast imaging devices, such as mammography and
ultrasound machines, to assist in the detection of breast cancer. Medical
personnel will use the CTLM(TM) at medical facilities to do breast examinations
during routine check-ups and during more specific investigations in connection
with breast cancer.

Computed Tomography has had a basis in the science of medical imaging since the
early 1970's. Our chief executive officer Richard Grable, had experience with
Computed Tomography that inspired him to invent CT Laser Mammography in 1989.
The issues of evolving laser technology and software occupied the first several
years of our existence. After several limited clinical trials in our facilities
and the Strax Diagnostic Breast Clinic we learned what changes were required to
improve performance and stability of CTLM(TM). These changes included the
technological advances made with the lasers and other components. On July 8,
1999 we began a clinical investigational trial at Nassau County Medical Center,
East Meadow, NY. The clinical trials were then expanded to University of
Virginia Health System, Charlottesville, VA on November 15, 1999.


In connection with CTLM(TM) clinical trials, we are developing a clinical atlas
of the optical properties of benign and malignant tissues. The CTLM(TM) is
designed to provide the physician with objective visual data for interpretation
and further clinical analysis. Accordingly, we believe that the CTLM(TM) will
improve early diagnosis, reduce diagnostic uncertainty and decrease the number
of biopsies performed on benign breast lesions.

Due to the delays in obtaining the new laser system, the delays in the
modification and redesign of the CTLM(TM) and delays beyond our control
regarding hospital-based clinical trials, we are unable to determine when we
will receive FDA marketing clearance. In addition, due to these delays, we are
unable to determine when we will begin to generate revenue.

Our executive offices are located at 6531 NW 18th Court, Plantation, Florida
33313. Our telephone number is (954) 581-9800.

                                       3



                               Recent Developments

On October 14, 1999, we exhibited our most recent clinical studies from our
ongoing clinical trials at Nassau County Medical Center at the 19th Annual
Breast Imaging Conference in Anaheim, CA. At this conference, our clinical
images were compared against those of x-ray mammograms.

In December 1999 at the 1999 Radiological Society of North America Meeting, we
presented for the first time for review to radiologists and other medical
professionals from around the world clinical images produced by the CTLM(TM). We
compared our images of various breast abnormalities acquired through our ongoing
clinical trials at Nassau County Medical Center with those images produced by
mammography equipment and ultrasound machines. We also demonstrated the
potential of fluorescence through a simulation with our CTLM(TM) device.

Furthermore, on November 29, 1999, we entered into a distribution agreement with
Cycle of Life Technologies, Inc., a division of INTRACOR Inc., an international
trading company of medical products based in Canada, which we believe will help
us generate up to $500,000 in revenues in the first quarter of 2000 and up to a
total of $12 million in revenues over the life of the agreement. This agreement
gives Cycle of Life the exclusive right to distribute and sell the CTLM(TM) in a
number of countries for a period of three years with the possibility of a
two-year extension of the exclusive distribution and sales rights if Cycle of
Life meets specific sales requirements. As of February 28, 2000, we have not
earned any revenues from this agreement. We are currently preparing the
necessary documents required for FDA export approval to allow us to sell the
CTLM(TM) in Canada.

In January 1997, we applied for a patent for a fluorescence imaging scanner. We
have received Issue Notification from the U.S. Department of Commerce, Patent
and Trademark Office indicating that the Patent for the fluorescence imaging
scanner was issued on September 14, 1999, as Patent No. 5,952,664. A fluorescent
marker is a chemical compound that allows light to be absorbed at specific
locations in the tissue, which assists in detection of cancerous tissues.

On February 1, 2000, we received a loan from Cycle of Life Technologies, Inc. in
the aggregate amount of $500,000 evidenced by a promissory note. The term of the
note is six months and the interest rate is 12% per annum.

We received notice from the U.S. Department of Commerce, Patent and Trademark
Office on February 8, 2000 that our patent application for our reconstruction
algorithm had been granted. This patent assigned to us protects the proprietary
algorithms that assists in the formation of the visual images of the CTLM(TM)
breast imaging device.

Our website has been updated with the latest White Paper on "The Potential of
Fluorescent markers in Medical Optical Imaging: Part Two." This "White Paper" is
a technical narrative written by our scientists and engineers which describes
the results of our experiments with fluorescent markers. In our ongoing research
in this area we plan to conduct fluorescence imaging in-vivo studies with
Indocyanine Green injections. These injections will be used in these studies to
further enhance the visual imaging of a suspicious lesion in the breast. We have
been granted FDA approval to conduct this study, using a maximum of 50 test
subjects, at a clinical site and we will begin this study once we have obtained
approval from the review boards of the medical institutions we have selected as
possible sites.

On February 22, 2000 we received notice from the U.S. Department of Commerce,
Patent and Trademark Office that our patent application for our breast perimeter
technique had been granted. The Patent No. is 6,029,077.

Clinical Update

On November 16, 1999, we announced our agreement with the University of Virginia
Health System as the second approved testing site. The FDA approved protocol
under the Investigational Device Exemption provides for 275 subjects, similar to
the Investigational Device Exemption protocol approved for Nassau County Medical
Center. The clinical investigational trials began on Monday, November 15, 1999.


                                       4


                                  The Offering

Securities Offered by Selling Security Holders

         Common Stock(1)(3)                                37,085,067


Equity Securities Outstanding(2)

         Common Stock                                      97,200,698(3)
         Series B Preferred                                        60
         Series I Preferred                                       123
         Warrants                                           1,058,125(4)
         Options                                            3,932,193(4)


(1)    According to the terms of the registration rights agreement among the
       preferred stockholders, debenture holders and us, the amount of common
       stock being registered and included in this prospectus is 100% of the
       number of shares of common stock that would be required to be issued if
       the preferred stock and debentures were converted on the day before the
       filing of the registration statement. We believe that this is a good
       faith estimate of the number of shares needed for conversion. In the
       event that additional shares are needed to meet conversion requirements,
       we will file a new registration statement to register the additional
       shares.
(2)    The total number of equity shares outstanding as of February 28, 2000.
(3)    The total number of shares of common stock does not include shares of
       common stock issuable upon conversion of the Series B and I preferred
       stock and the debenture which, for the purpose of this prospectus, are
       estimated to represent 177,111, 2,466,953 and 1,010,482 shares of common
       stock, respectively, and warrants and options to purchase 1,058,125 and
       3,932,193 shares of common stock, respectively.
(4)    The options were issued in connection with our stock option plan and/or
       in connection with some of our employment agreements. The exercise prices
       of the options range from $.15 to $4.35 per share. The warrants were
       issued to consultants, finders and private placement investors. The
       exercise prices of the warrants range from $.50 to $5.00.


                                       5


                                  Risk Factors

         An investment in the common stock offered is highly speculative and
involves a high degree of risk. Accordingly, you should consider all of the risk
factors discussed below, as well as the other information contained in this
document. You should not invest in our common stock unless you can afford to
lose your entire investment and you are not dependent on the funds you are
investing.

                   Risks associated with our financial results

We have and are incurring significant losses and we may not be able to continue
our business in the future.


At December 31, 1999, we had an accumulated deficit of approximately
$37,709,561, after discounts and dividends on preferred stock. These losses have
resulted principally from costs associated with research and development,
clinical trials and from general and administrative costs associated with our
operations. We expect operating losses will increase for at least the next
several years due primarily to the anticipated expenses associated with:

o    development,
o    clinical trials,
o    pre-market approval process,
o    anticipated commercialization of the CTLM(TM), and
o    other research and development activities that may arise.


We have a limited history of operations. Since our inception in December 1993,
we have been engaged principally in the development of the CTLM(TM), which has
not been approved for sale in the United States. In addition, we have not
applied to the FDA for export approval for foreign sales. Consequently, we have
little experience in manufacturing, marketing and selling our products. We
currently have no source of operating revenue and have incurred net operating
losses since inception.

Our auditor's have raised substantial doubts as to our ability to continue as a
going concern as we have not been and may not be able to be profitable.

We have received an opinion from our auditors stating that the fact that we have
suffered substantial losses and have yet to generate an internal cash flow
raises substantial doubt about our ability to continue as a going concern. Our
ability to achieve profitability will depend on our ability to obtain regulatory
approvals for the CTLM(TM), develop the capacity to manufacture and market the
CTLM(TM), either by our self or in collaboration with others and market
acceptance of the CTLM(TM). However, there can be no assurance we will achieve
profitability if and when we receive regulatory approvals for the development,
commercial manufacturing and marketing of the CTLM(TM).

                    Risks associated with our lack of capital

We require additional capital which we may be unable to raise which may cause us
to stop or cut back our operations.


Through February 28, 2000 we have spent approximately $37 million and expect to
spend another $4.2 million in order to bring the CTLM(TM) into the United States
market. After receiving pre-market approval from the FDA, we anticipate that we
will need approximately $9.0 million over the next two years to complete all
necessary stages in order to market the CTLM(TM) in the United States and
foreign countries. At present we do not have the required capital to do this and
will require substantial additional funds to market this product, including
funds for:


o    clinical testing of the CTLM(TM)device,
o    research, engineering and development programs,

                                       6



o    pre-clinical and clinical testing of other proposed products,
o    regulatory processes,
o    inventory, such as sub-contracted components,
o    manufacturing and marketing programs, and
o    operating expenses (including general and administrative expenses).


Our future capital requirements depend on many factors, including the following:

o    the progress of our research and development projects,
o    the progress of pre-clinical and clinical testing,
o    the time and cost involved in obtaining regulatory approvals,
o    the cost of filing, prosecuting, defending and enforcing any patent claims
     and other intellectual property rights; competing technological and market
     developments; changes and developments in our existing collaborative,
     licensing and other relationships and the terms of any new collaborative,
     licensing and other arrangements that we may establish, and
o    the development of commercialization activities and arrangements.

In addition, our fixed commitments are substantial and would increase if
additional agreements were entered into and additional personnel were retained.
We do not expect to generate a positive internal cash flow for at least several
years due to expected increases in capital expenditures, working capital needs,
and ongoing losses. There can be no assurance that additional financing will be
available when needed, or if available, will be available on acceptable terms.
We have already granted a mortgage on our corporate property as security for a
debenture and in all likelihood, would be unable to use this property to
collateralize any additional financing. Insufficient funds may prevent us from
implementing our business strategy and will require us to further delay, scale
back or eliminate our research, product development and marketing programs; and
may require us to license to third parties rights to commercialize products or
technologies that we would otherwise seek to develop ourselves, or to scale back
or eliminate our other operations.


We have had and may have to issue securities for services which may further
depress our stock price and dilute the holdings of our shareholders.

Since we have generated no revenues to date, our ability to obtain and retain
consultants may be dependent on our ability to issue stock for services. Since
July 1, 1996, we have issued an aggregate of 1,806,500 shares of common stock
according to registration statements on Form S-8. The aggregate fair market
value of the shares when issued was $2,327,151. The issuance of large amounts of
our common stock for services rendered or to be rendered and the subsequent sale
of these shares may further depress the price of our common stock and dilute the
holdings of our shareholders. In addition, because of the possible dilution to
existing shareholders, the issuance of substantial additional shares may cause a
change-in-control.

We have in the past and may have to in the future sell additional unregistered
securities, possibly without limitations on the number of common shares the
securities are convertible into, which could dilute the value of the holdings of
current shareholders.

We have had to and have to rely on the private placement of preferred and common
stock and convertible debentures to obtain working capital and will continue to
do so in the future. As of the date of this registration statement, we have
issued 55,979,558 shares of common stock which were converted from preferred
stock and debentures that we privately placed. This number of shares of common
stock represents approximately 57.6%of the currently outstanding number of
shares of common stock.

In deciding to issue preferred stock and debentures through private placements,
we took into account:


o    the number of common shares authorized and outstanding,
o    the market price of the common stock at the time of each preferred or
     debenture sale and
o    the number of common shares the preferred stock would have been convertible
     into at the time of the sale.

                                       7


At the time of each private placement there were enough shares, based on the
price of our common stock at the time of the sale of the preferred stock to
satisfy the preferred conversion requirements. Although our board of directors
tried to negotiate a floor on the conversion price of each series of preferred
stock and the debentures prior to their sale, it was unable to do so.

Manipulation of our common stock through short sales and offers to sell our
preferred stock at a substantial discount may artificially depress our stock
price. These types of transactions are sometimes referred to as "toxic"
securities. After the stock is manipulated and the price is driven down, the
preferred stock is then converted which may give the preferred shareholder
control over a substantial percentage of the public float of our stock.

In order to obtain working capital we will continue to:

o    seek capital through debt or equity financing which may include the
     issuance of convertible preferred stock whose rights and preferences are
     superior to those of the common stock holders, and
o    try to negotiate the best transaction possible taking into account the
     impact on our shareholders, dilution, loss of voting power and the
     possibility of a change-in-control.

However, in order to satisfy our working capital needs, we may be forced to
issue convertible securities with no limitations on conversion.


In the event that we issue convertible preferred stock or convertible debentures
without a limit on the number of shares that can be issued upon conversion and
the price of our common stock decreases:

o    the percentage of shares outstanding that will be held by these holders
     upon conversion will increase accordingly,
o    the lower the market price the greater the number of shares to be issued to
     these holders upon conversion, thus increasing the potential profits to the
     holder when the price per share then increases and the holder sells the
     common shares,
o    the preferred stockholders' and debenture holders potential for increased
     share issuance and profit, including profits derived from shorting our
     common stock, in addition to a stock overhang of an indeterminable amount,
     may depress the price of our common stock,
o    the sale of a substantial amount of preferred stock to relatively few
     holders could effectuate a possible change-in-control and
o    in the event of our voluntarily or involuntarily liquidation while the
     preferred stock is outstanding, the holders will be entitled to a
     preference in distribution of our property.

We may draw on our equity credit line which may cause the value of our common
stock to decline and dilute the holdings of our shareholders.


We have a firm commitment for a $15.0 Million, three-year equity line of credit.
Pursuant to the equity line of credit, when we feel it necessary, we may raise
capital through the sale of our common stock to a consortium of prominent
European banking institutions. In order to use the equity credit line, our
common stock must trade above $.50 per share. We would also be required to file
a shelf registration statement or other registration that may be available to
us. We may need capital in excess of the equity line of credit or if we decline
to use the equity line of credit, we may seek additional funding through public
or private financing or collaborative, licensing and other arrangements with
corporate partners. If we utilize the equity line of credit or additional funds
are raised by issuing equity securities, especially convertible preferred stock,
dilution to existing shareholders will result and future investors may be
granted rights superior to those of existing shareholders.

We have had and may have to issue securities in order to pay off our debts which
may further depress our stock price and dilute the holdings of our shareholders.

Since we have generated no revenues to date, we have had difficulty in paying
off some of our debts which have become due. In order to pay these debts, we
have issued shares of common stock. For example, since the beginning of December
30, 1999, we have paid off approximately $532,100 in debt by issuing 3,129,811
shares of restricted


                                       8


common stock. In addition, as we have little or no present revenues, we may have
to issue more shares of common stock in order to pay off current or future debts
which become due. This type of issuance of common stock to pay off debt may
further depress the price of our common stock and would dilute the holdings of
our shareholders, and if substantial dilution does occur, could also cause a
change-in-control.


Conversions of our convertible preferred stock and exercise of our convertible
debenture and warrants may cause other detrimental effects to the value of our
shareholders' holdings.

If the market price declines significantly, we could be required to issue a
number of shares of common stock sufficient to result in our current
stockholders not having an effective vote in the election of directors and other
corporate matters. In the event of a change-in-control, it is possible that the
new majority stockholders may take actions that may not be consistent with the
objectives or desires of our current stockholders.



We are required to convert the convertible preferred stock and convertible
debenture based on a formula that varies with the market price of our common
stock. As a result, if the market price of our common stock increases after the
issuance of our convertible preferred stock and convertible debenture, it is
possible that, upon conversion of the convertible preferred stock and
convertible debenture, we will issue shares of common stock at a price that is
less than the then-current market price of the common stock.

If the market price of our common stock decreases after we issue the convertible
preferred stock or convertible debenture, upon conversion, we will have to issue
an increased number of shares to the preferred stock and convertible debenture
holder. The sale of convertible preferred stock and debentures may result in a
very large conversion at one time. If we do not have a sufficient number of
shares to cover the conversion we may have a risk of a civil lawsuit.

In addition, the warrants we issued are exercisable at a fixed price. If the
market price of our common stock increases above the warrant exercise price, we
will be required to issue shares of common stock upon exercise of the warrants
at a price that is less than the then-current market price. Issuances at less
than market price pose a risk to investors because these issuances may drive
down the market price of our common stock.

                       Risks associated with our industry

We depend on market acceptance to sell our products which have not been proven
and may not occur which would depress our sales.

There can be no assurance that physicians or the medical community in general,
will accept and utilize the CTLM(TM) or any other products that we develop. The
extent and rate the CTLM(TM) achieves market acceptance and penetration will
depend on many variables, including, but not limited to:

o    the establishment and demonstration in the medical community of the
     clinical safety, efficacy and cost-effectiveness of the CTLM(TM),
o    the advantages of the CTLM(TM)over existing technology and cancer detection
     methods, including:
         -        X-ray mammography,
         -        Ultrasound or high frequency ultrasound,
         -        MRI,
         -        Thermography,
         -        Diaphonography,
         -        Electrical impedance, and
         -        Transillumination devices
o    third-party reimbursements practices, and
o    our manufacturing, quality control, marketing and sales efforts.

There can be no assurance that the medical community and third-party payers will
accept our unique technology. Similar risks will confront any other products we
develop in the future. Failure of our products to gain market

                                       9


acceptance would hinder our sales efforts resulting in a loss of revenues and
net profit. It would further prevent us from developing new products.

Lack of third-party reimbursement may have a negative impact on the sales of our
products which would negatively impact our revenues.

In the United States, suppliers of health care products and services are greatly
affected by Medicare, Medicaid and other government insurance programs, as well
as by private insurance reimbursement programs. Third-party payers (Medicare,
Medicaid, private health insurance companies, and other organizations) may
affect the pricing or relative attractiveness of our products by regulating the
level of reimbursement provided by these payers to the physicians, clinics and
imaging centers utilizing the CTLM(TM) or any other products that we may
develop, by refusing reimbursement. The level of reimbursement, if any, may
impact the market acceptance and pricing of our products, including the
CTLM(TM). Failure to obtain favorable rates of third-party reimbursement could
discourage the purchase and use of the CTLM(TM) as a diagnostic device.

In international markets, reimbursement by private third-party medical insurance
providers, including governmental insurers and independent providers varies from
country to country. In addition, such third-party medical insurance providers
may require additional information or clinical data prior to providing
reimbursement for a product. In some countries, our ability to achieve
significant market penetration may depend upon the availability of third-party
governmental reimbursement. Revenues and profitability of medical device
companies may be affected by the continuing efforts of governmental and third
party payers to contain or reduce the cost of health care through various means.

There are uncertainties regarding healthcare reform including possible
legislation, whereby our customers may not receive medical reimbursement for the
use of our product on their patients, which may cause our customers to use other
services and products.

Several states and the United States government are investigating a variety of
alternatives to reform the health care delivery system. These reform efforts
include proposals to limit and further reduce and control health care spending
on health care items and services, limit coverage for new technology and limit
or control the price health care providers and drug and device manufacturers may
charge for their services and products, respectively. If adopted and
implemented, these reforms could cause our healthcare providers to limit or not
use the CTLM(TM) systems.

Competition in the medical imaging industry may result in competing products,
superior marketing and lower revenues and profits for us.

The market in which we intend to participate is highly competitive. Many of the
companies in the cancer diagnostic and screening markets have substantially
greater technological, financial, research and development, manufacturing, human
and marketing resources and experience than we do. These companies may succeed
in developing, manufacturing and marketing products that are more effective or
less costly than our products. Physicians using imaging equipment such as x-ray
mammography equipment, ultrasound or high frequency ultrasound systems, magnetic
resonance imaging systems, and thermography, diaphonography and
transilluminational devices may not use our products. Currently mammography is
employed widely and our ability to sell the CTLM(TM) to medical facilities will,
partially depend on our ability to demonstrate the clinical utility of the
CTLM(TM) as an adjunct to mammography and physical examination and its
advantages over other available diagnostic tests. The competition for developing
a commercial device utilizing computed tomography techniques and laser
technology is difficult to ascertain given the proprietary nature of the
technology. There are a significant number of academic institutions involved in
various areas of research involving "optical medical imaging" which is a
shorthand description of the technology our CTLM(TM) utilizes.

                                       10


                      Risks associated with our securities

Our common stock is considered "penny stock" and may be difficult to sell.

The SEC has adopted regulations, which generally define "penny stock" to be an
equity security that has a market price of less than $5.00 per share or an
exercise price of less than $5.00 per share, subject to specific exemptions.
Presently, the market price of our common stock is substantially less than $5.00
per share and therefore may be designated as a "penny stock" according to SEC
rules. This designation requires any broker or dealer selling these securities
to disclose certain information concerning the transaction, obtain a written
agreement from the purchaser and determine that the purchaser is reasonably
suitable to purchase the securities. These rules may restrict the ability of
brokers or dealers to sell our common stock and may affect the ability of
investors to sell their shares. In addition, since our common stock is traded on
the NASDAQ OTC Bulletin Board, investors may find it difficult to obtain
accurate quotations of our common stock.

The volatility of our stock price could adversely affect your investment in our
common stock.

The price of our common stock has fluctuated substantially since it began
trading on the OTC Bulletin Board in September 1994. The market price of our
shares, like that of the common stock of many other medical device companies, is
likely to continue to be highly volatile. Factors that may have an impact on the
price of our common stock include:

o    the timing and results of our clinical trials or our competitors,
o    governmental regulation,
o    healthcare legislation,
o    equity or debt financing, and
o    developments in patent or other proprietary rights pertaining to our
     competitors or us, including litigation, fluctuations in our operating
     results, and market conditions for medical device company stocks and life
     science stocks in general.

We may issue preferred stock at any time to prevent a takeover or acquisition,
any of which issuance could dilute the price of our common stock.

Our articles of incorporation authorize the issuance of preferred stock with
designations, rights, and preferences that may be determined from time to time
by the board of directors. Our board of directors is empowered, without
stockholder approval, to designate and issue additional series of preferred
stock with dividend, liquidation, conversion, voting and other rights, including
the right to issue convertible securities with no limitations on conversion,
which could adversely affect the voting power or other rights of the holders of
our common stock. This could substantially dilute the common shareholder's
interest and depress the price of our common stock. In addition, the preferred
stock could be utilized, as a method of discouraging, delaying or preventing a
change-in-control. The substantial number of issued and outstanding convertible
preferred stock and the convertible debentures, and their terms of conversion
may discourage or prevent an acquisition of our company


Although we have increased the number of shares of our authorized common stock
in order to help facilitate the conversion and exercise of outstanding and
future preferred stock and other securities, which conversion and exercise would
depress the value of our common stock and dilute shareholdings, we still may not
have enough authorized common stock available to convert the debentures and the
outstanding Series B and I preferred stock into common stock.

According to a written action of a majority of our shareholders, we have amended
our articles of incorporation, to increase our authorized common stock from
48,000,000 shares to 100,000,000 shares in order to facilitate the conversion of
our outstanding preferred stock and debentures. Prior to the amendment, we did
not have an adequate number of shares authorized to meet our contractual
obligations due to the decrease in our stock price. Furthermore, as our stock
price continues to fluctuate, even with this increase in the authorized common
stock, we may still not be able to convert into common stock the debentures and

                                       11


the Series B and I preferred stock which could cause us to accrue liquidated
damages under our registration rights agreement. The holder, Charlton Avenue
LLC, has waived its rights to any liquidated damages in may have in connection
with these securities through April 30, 2000. As long as we have outstanding
securities convertible into common stock at a price dependent on the market
price of the common stock, we may have to increase our authorized common stock
in order to have the available authorized common stock for conversions of these
convertible securities, which would result in further dilution to our existing
stockholders.

In addition, until the time when we are able to generate revenues, we are
dependent on equity or other financing to continue operations and the amendment
affords us common stock to finance our operations through equity financings,
which we will continue to do, as we will require substantial additional funds
for our operations. We may again be obligated to increase our authorized common
stock from 100,000,000 shares to 150,000,000 to facilitate the conversion of our
outstanding preferred stock and debentures.

Based on the closing price of our common stock as of February 28, 2000, of
$3.8438 per share, approximately:

o    177,111 shares would be required to convert the Series B shares,
o    2,466,953 shares would be required to convert the Series I shares,
o    1,010,482 shares would be required to convert the debentures and
o    although we are contractually prohibited from doing so, 4,877,985 shares
     would be required to draw down the entire equity line of credit.

In addition, 4,990,318 shares would be required for the exercise of options and
warrants. Based upon this information, as of February 28, 2000, we would need in
excess of approximately 10 million authorized shares for all conversions,
complete utilization of the equity line of credit and fulfillment of our
remaining stock related obligations.

We currently are controlled by our executive officers and directors, however, if
outstanding preferred stock and debentures are converted, a change-in-control
may occur.

Our management beneficially owns 21.9% including options, of our outstanding
common stock, assuming no exercise of outstanding warrants, options, or
conversion of preferred stock. Although management owns less than 50.1% of the
outstanding common stock, since we do not have cumulative voting, and since, in
all likelihood the officers will be voting as a block and will be able to obtain
proxies of other shareholders, management should continue to remain in a
position to elect all of our directors and control our policies and operations.
However, after giving effect to the conversion of the preferred stock and
debentures, management would own only 20.5% as of February 28, 2000. This
additional dilution to management's ownership percentage could cause a
change-in-control.


We have not paid and do not currently intend to pay dividends, which may limit
the current return you may receive on your investment in our common stock.

Since inception, we have not paid a dividend on our common stock and do not
intend to pay dividends on our common stock in the foreseeable future.

                      Risks associated with our technology

We depend on a patent licensed to us by our founder without which our operations
would cease.


We own the rights, through an exclusive patent licensing agreement, for the use
of the patent for the CTLM(TM) technology. Richard Grable owns the patent. In
addition, we have 10 additional United States patents pending with regard to
optical tomography, many of which are based on the original CTLM(TM) technology.
In the event that we breach the patent licensing agreement, we could lose the
licensing rights to the CTLM(TM) technology. The loss of the patent license
would have a material adverse effect on us and our continued operations.


                                       12



Our business would lose its primary competitive advantage if we are unable to
protect our proprietary technology, or if substantially the same technology is
developed by others.


We rely primarily on a combination of trade secrets, patents, copyright and
trademark laws, and confidentiality procedures to protect our technology.

Our ability to compete effectively in the medical imaging products industry will
depend on our success in protecting our proprietary technology, both in the
United States and abroad. There can be no assurances that any patent that we
apply for will be issued, or that any patents issued will not be challenged,
invalidated, or circumvented, or that the rights granted will provide any
competitive advantage. Neither we nor Mr. Grable hold foreign patents, however,
we have applied for patents in several foreign countries. We could incur
substantial costs in defending any patent infringement suits or in asserting any
patent rights, including those granted by third parties, the expenditure of
which we might not be able to afford.

Although we have entered into confidentiality and invention agreements with our
employees and consultants, there can be no assurance that these agreements will
be honored or that we will be able to protect our rights to our non-patented
trade secrets and know-how effectively. There can be no assurance that others
will not independently develop substantially equivalent proprietary information
and techniques or otherwise gain access to our trade secrets and know-how. In
addition, we may be required to obtain licenses to patents or other proprietary
rights from third parties. If we do not obtain required licenses, we could
encounter delays in product development or find that the development,
manufacture, or sale of products requiring these licenses could be foreclosed.
Additionally, we may, from time to time, support and collaborate in research
conducted by universities and governmental research organizations. There can be
no assurance that we will have or be able to acquire exclusive rights to the
inventions or technical information derived from such collaborations or that
disputes will not arise with respect to rights in derivative or related research
programs that we conducted in conjunction with these organizations.


It may be necessary to enter into unfavorable agreements or defend law suits
which would be costly if we infringe upon the intellectual property rights of
others.


There has been substantial litigation regarding patent and other intellectual
property rights in the medical device and related industries. We have been, and
may be in the future, notified that we may be infringing on intellectual
property rights possessed by other third parties. If any claims are asserted
against our intellectual property rights, we may seek to enter into royalty or
licensing arrangements. There is a risk in situations that no license will be
available or that a license will not be available on reasonable terms.
Alternatively, we may decide to litigate these claims or design around the
patented technology. These actions could be costly and would divert the efforts
and attention of our management and technical personnel. Consequently, any
infringement claims by third parties or other claims for indemnification by
customers resulting from infringement claims, whether or not proven to be true,
may be costly to defend and may further limit the use of our technology.

We may not be able to keep up with the rapid technological change in the medical
imaging industry which could make the CTLM(TM) obsolete.

Methods for the detection of cancer are subject to rapid technological
innovation and there can be no assurance that technical changes will not render
our proposed products obsolete. Although we believe that the CTLM(TM) can be
upgraded to maintain its state-of-the-art character, the development of new
technologies or refinements of existing ones might make our existing system
technologically or economically obsolete, or cause a reduction in the value of,
or reduce the need for, our CTLM(TM). There can be no assurance that the
development and commercial availability of new types of diagnostic medical
equipment or technology will not have a material adverse effect on our business,
financial condition, and results of operations. Although we are aware of no
substantial technological changes pending, should a change occur, there can be
no assurance that we will be able to acquire the new or improved systems which
may be required to update the CTLM(TM).

                                       13


                       Risks associated with our business


We may not find sufficient facilities to adequately test the CTLM(TM) and, in
addition, clinical trials done at any of these facilities may not be successful,
which may keep us from receiving FDA approval.

We currently have two CTLM(TM) functioning and being tested, one in Nassau
County Medical Center and one in the University of Virginia Health System,
pursuant to investigational device exemptions granted by the FDA. The testing is
designed to develop diagnostic criteria for CTLM(TM) images. We have entered
into discussions with several hospitals, which are located throughout the United
States for further potential clinical test sites. The remaining proposed sites
have indicated an interest in participating in our clinical trials, however, we
do not anticipate a formal response until February 2000 at which point we would
have to request permission from the FDA to expand our clinical trials. The
delays are due to the time required for site surveys, locating available rooms
for the CTLM(TM) in the hospitals, subsequent room renovations and the hiring
and training of additional clinical application specialists. Furthermore, the
approval boards of some hospitals only meet once per month approval may be
further delayed. At the conclusion of the clinical trials we will submit the
pre-market approval application for the CTLM(TM).


Furthermore, there can be no assurance that:

o    results obtained in any additional trials will be consistent with the
     results obtained in trials conducted by us to date;
o    results obtained in any clinical trial or series of clinical trials will be
     consistent among all study sites, or
o    results obtained in clinical trials conducted with U.S. study populations
     will be consistent with results obtained in studies conducted in Europe or
     other locations outside of the U.S.

We must comply with extensive government regulation and have no assurance of
regulatory approvals or clearances which could cause us to cut back or cease
operations.

Our delay or inability to obtain any necessary United States, state or foreign
regulatory clearances or approvals for our products would prevent us from
selling the CTLM(TM) system in the U.S. and other countries.

In the United States, the CTLM(TM) is regulated as a medical device and is
subject to the FDA's pre-market clearance or approval requirements. To obtain
FDA approval of an application for pre-market approval, the pre-market approval
application must demonstrate that the subject device has clinical utility,
meaning that the device has a beneficial therapeutic effect, or that as a
diagnostic tool it provides information that measurably contributes to a
diagnosis of a disease or condition.

We cannot file our pre-market approval application for the CTLM(TM) until our
clinical trials are completed. There can be no assurance, that our clinical
trials will be successfully completed, or if completed, will provide sufficient
data to support a pre-market approval application for the CTLM(TM); nor can
there be any assurance that the FDA will not require us to conduct additional
clinical trials for the CTLM(TM), which would delay the CTLM(TM) coming onto the
market.


In addition, sales of medical devices outside the United States may be subject
to international regulatory requirements that vary from country to country. The
time required to gain approval for international sales may be longer or shorter
than required for FDA approval and the requirements may differ. For example, in
order to sell our products within the European economic area, companies are
required to achieve compliance with the requirements of the medical devices
directive and affix a "CE" marking on their products to attest compliance. We
are in preliminary preparations regarding CE certification in Europe which
certification would allow us to conduct sales in member countries of the
European Union.

As of the date of this prospectus, we have not yet obtained these international
certifications and there can be no assurance that we will be able to do so.


                                       14


Regulatory approvals, if granted, may include significant limitations on the
indicated uses for which the CTLM(TM) may be marketed. In addition, to obtain
these approvals, the FDA and certain foreign regulatory authorities may impose
numerous other requirements which medical device manufacturers must comply with.
FDA enforcement policy strictly prohibits the marketing of approved medical
devices for unapproved uses. Product approvals could be withdrawn for failure to
comply with regulatory standards or the occurrence of unforeseen problems
following initial marketing.

The third-party manufacturers upon which we will depend to manufacture our
products are required to adhere to applicable FDA regulations regarding, quality
systems regulations commonly referred to as QSR,s, which include testing,
control and documentation requirements Failure to comply with applicable
regulatory requirements, including marketing and promoting products for
unapproved use, could result in warning letters, fines, injunctions, civil
penalties, recall or seizure of products, total or partial suspension of
production, refusal of the government to grant pre-market clearance or approval
for devices, withdrawal of approvals and criminal prosecution. Changes in
existing regulations or adoption of new government regulations or polices could
prevent or delay regulatory approval of our products. Material changes to
medical devices also are subject to FDA review and clearance or approval.

In addition, unapproved products subject to the pre-market approval requirements
must receive prior FDA export approval in order to be marketed outside of the
United States unless they are approved for use by any member country of the
European Union or certain other countries, including Australia, Canada, Israel,
Japan, New Zealand, Switzerland and South Africa, in which case the products can
be exported to any country provided that limited notification requirements are
met. There can be no assurance that we will meet the FDA's export requirements
or receive FDA export approval when our approval is necessary, or that countries
to which the devices are to be exported will approve the devices for import. Our
failure to meet the FDA's export requirements or obtain FDA export approval when
required to do so, or to obtain approval for import, could have a material
adverse effect on our business, financial condition, cash flows and results of
operations.

There can be no assurance that we will be able to obtain or maintain the
following:

o    FDA approval of a pre-market approval application for the CTLM(TM),
o    foreign marketing clearances for the CTLM(TM)or regulatory approvals or
     clearances for other products that we may develop, on a timely basis, or at
     all,
o    timely receipt of approvals or clearances,
o    continued approval or clearance of previously obtained approvals and
     clearances, and
o    compliance with existing or future regulatory requirements.

If we do not obtain or maintain any of the above-mentioned standards, there may
be material adverse effects on our business, financial condition and results of
operations.

We may not be able to develop other products that are currently in the early
stages of development due to our need for additional capital.

Due to our need for additional capital, our proposed products, other than the
CTLM(TM) device, including a scanner for the early detection of colon cancer,
are at early stages of development. There can be no assurance that any of our
proposed products will be, including the CTLM(TM):

o    found to be safe and effective,
o    meet applicable regulatory standards or receive necessary regulatory
     clearance,
o    or if safe and effective, can be developed into commercial products,
     manufactured on a large scale or be economical to market, or
o    achieve or sustain market acceptance.

Therefore, there is substantial risk that our product development and
commercialization efforts will not prove to be successful for our products.

                                       15


We will depend on a single product, the CTLM(TM), for our revenue in the next
few years, any problems with which would cause adverse affects to our business.

We are in the process of developing additional products based on our main
technology, including an enhancement of the CTLM(TM) device for use with
fluorescence contrast agents and photo-dynamic therapy drugs. Photo-dynamic
therapy drugs seek out cancer and are activated by light. Neither application is
expected to result in a commercial product for at least several years, if at
all. Consequently, pending its approval for commercial distribution in the
United States, the CTLM(TM) device would account for substantially all of our
revenues for at least the next two years. Failure to gain regulatory approvals
or market acceptance for the CTLM(TM) device would prevent the sale of the
CTLM(TM) device in the U.S. and other countries adhering to FDA approved
guidelines.

We depend upon suppliers with whom we have no contracts which suppliers could
cause production disruption if they terminated or changed their relationships
with us.

We believe that there are a number of suppliers for most of the components and
subassemblies required for the CTLM(TM). Particular components for our laser
system are provided by two unrelated suppliers. Although these components are
provided by a limited number of other suppliers, we believe our laser suppliers
and their products are the most reliable. We have no agreement with our laser
suppliers and purchase the laser components on an as needed basis. For certain
services and components, we currently rely on single suppliers. If we encounter
delays or difficulties with our third-party suppliers in producing, packaging,
or distributing components of the CTLM(TM) device, market introduction and
subsequent sales would be adversely affected.

We have no experience in sales, marketing and distribution which could
negatively impact our ability to enter into collaborative arrangements or other
third party relationships which are important to the successful development and
commercialization of our products and potential profitability.

We have limited internal marketing and sales resources and personnel. There can
be no assurance that we will be able to establish sales and distribution
capabilities or that we will be successful in gaining market acceptance for any
products we may develop. There can be no assurance that we will be able to
recruit and retain skilled sales, marketing, service or support personnel, that
agreements with distributors will be available on terms commercially reasonable
to us, or at all, or that our marketing and sales efforts will be successful.

There can be no assurance that we will be able to further develop our
distribution network on acceptable terms, if at all or that any of our proposed
marketing schedules or plans can or will be met.

We depend on qualified personnel to run and develop our specialized business who
we may be unable to retain or hire.

Due to the specialized scientific nature of our business, we are highly
dependent upon our ability to attract and retain qualified scientific, technical
and managerial personnel. We have entered into employment agreements with some
of our executive officers and key employees. The loss of the services of
existing personnel, especially Mr. Grable, as well as the failure to recruit key
scientific, technical and managerial personnel in a timely manner would be
detrimental to our research and development programs and could have an adverse
impact upon our business affairs and finances. Our anticipated growth and
expansion into areas and activities requiring additional expertise, such as
marketing, will require the addition of new management personnel. Competition
for qualified personnel is intense and there can be no assurance that we will be
able to continue to attract and retain qualified personnel necessary for the
development of our business.

We have a possible conflict of interest in our management which could cause us
to enter into agreements on less favorable terms than we may otherwise get.

Richard Grable and Linda Grable hold a majority of the seats on our board of
directors. Consequently, they are in a position to control their own
compensation and to approve affiliated transactions. For example, in June 1998,

                                       16


we finalized an exclusive patent license agreement with Richard Grable. The
board's policy is to obtain unanimous consent for affiliated transactions and
compensation issues. Although our board intends to act fairly and in full
compliance with its fiduciary obligations, there can be no assurance that we
will not, as a result of the conflict of interest described above, enter into
arrangements under terms less favorable than those which we could have obtained
had we been dealing with unrelated persons.

We have a limited manufacturing history which could cause delays in the
production and shipment of our product.

We will have to expand our CTLM(TM) manufacturing and assembly capabilities and
contract for the manufacture of the CTLM(TM) components in volumes that will be
necessary for us to achieve significant commercial sales in the event we begin
foreign sales and/or obtain regulatory approval to market our products in the
United States. We have limited experience in the manufacture of medical products
for clinical trials or commercial purposes. Should we manufacture our products,
our manufacturing facilities would be subject to the full range of the FDA's
current quality system regulations, and we would need additional capital to
establish these types of facilities. In addition, there can be no assurance that
we would be able to manufacture our products successfully or cost-effectively.

We depend on third parties who may not be in compliance with the FDA's quality
system regulations which may delay the approval or decrease the sales of the
CTLM(TM).

We have used and do use third parties to manufacture and deliver the components
of the CTLM(TM) and intend to continue to use third parties to manufacture and
deliver these components and other products we may develop. There can be no
assurance that the third-party manufacturers we depend on for the manufacturing
of CTLM(TM) components will be in compliance with the quality system regulations
at the time of the pre-approval inspection or will maintain compliance
afterwards. This failure could significantly delay FDA approval of the
pre-market approval application for the CTLM(TM) device.

We have had and may have delays in getting our products to market both
domestically and internationally which have hindered and may hinder our sales.

Originally, we anticipated that the CTLM(TM) would be ready for distribution in
the summer of 1998, however, during the course of clinical trials, we learned of
problems with particular components of the CTLM(TM) that needed to be corrected
before distribution. Solutions to these problems had to be found and adjustments
had to be made to the CTLM(TM) to correct these problems. Specifically, the
laser components, the electronic technology involved in image acquisition and
the fiber optics had to be modified.


As of the date of this prospectus, our Canadian distributor has placed an order
for two CTLM(TM) systems to be delivered in late March 2000. We are currently
preparing the necessary documents required for FDA export approval to Canada. We
intend to continue to sell CTLM(TM) systems through distributors in those
countries where sales are permitted. No CTLM(TM) systems have been sold pursuant
to an investigational device exemption in the United States market.


We will rely on international sales and may be subject to risks associated with
international commerce.

We intend to commence international sales of the CTLM(TM) in Canada, Europe and
Asia, prior to commencing commercial sales in the U.S. Until we receive
pre-market approval from the FDA to market the CTLM(TM) in the United States,
our revenues, if any, will be derived from sales to international distributors.
A significant portion of our revenues may be subject to the risks associated
with international sales, including:

o    economical and political instability,
o    shipping delays,
o    fluctuation of foreign currency exchange rates,
o    foreign regulatory requirements, and

                                       17


o    various trade restrictions, all of which could have a significant impact on
     our ability to deliver products on a timely basis.

Significant increases in the level of customs duties, export quotas or other
trade restrictions could have a material adverse effect on our business,
financial condition and results of operations. The regulation of medical
devices, particularly in Europe, continues to develop and there can be no
assurance that new laws or regulations will not have an adverse effect on us. In
order to minimize the risk of doing business with distributors in countries
which are having difficult financial times, our international distribution
agreements all require payment via an irrevocable letter of credit drawn on a
United States bank prior to shipment of the CTLM(TM).

Our business has the risk of product liability claims and preferred insurance
coverage may be expensive or unavailable which may expose us to material
liabilities.

Our business exposes us to potential product liability risks, which are inherent
in the testing, manufacturing, and marketing of cancer detection products.
Significant litigation, not involving us, has occurred in the past based on the
allegations of false negative diagnoses of cancer. While the CTLM(TM) device is
being developed as an adjunct to other diagnostic techniques, there can be no
assurance that we will not be subjected to future claims and potential
liability. Although the FDA does not require product liability insurance with
regard to clinical investigations, we obtained and presently carry product
liability insurance in the amount of $3,000,000, at the request of Nassau
County. While we plan to maintain insurance against product and professional
liability and defense costs, there can be no assurance that claims against us
arising with respect to our products will be successfully defended or that the
insurance to be carried by us will be sufficient to cover liabilities arising
from any claims. A successful claim against us in excess of our insurance
coverage could have a material adverse effect on us. Furthermore, there can be
no assurance that we will be able to continue to obtain or maintain product
liability insurance on acceptable terms.

We lack a feasibility study and do not know if sufficient demand exists for our
product.

We have not performed any market or feasibility study to assess the interest,
demand, or need for the CTLM(TM). There can be no assurance that a study would
support management's belief that sufficient demand will exist.

                       Where You Can Find More Information

We have filed with the SEC a Registration Statement on Form S-2 with all
amendments and exhibits under the Securities Act of 1933, concerning the common
stock offered in this prospectus. This prospectus does not contain all of the
information contained in the registration statement. We have omitted parts of
the registration statement in accordance with the rules and regulations of the
SEC. For further information with respect to IDSI and our securities, you should
refer to the registration statement, including its schedules and exhibits.
Statements contained in this prospectus as to the contents of any contract or
other document are not necessarily complete and, in each instance, you should
refer to the copy of the filed contract or document which is qualified in all
respects by such reference. You may obtain copies of the registration statement
from the SEC's principal office in Washington, D.C. upon payment of the fees
prescribed by the SEC, or you may examine the registration statement without
charge at the offices of the SEC described below.

We have filed annual, quarterly and special reports, proxy statements, and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms at 450 Fifth Street, NW, Washington, DC 20549.
Please call the SEC at 1-800-SEC-0330 for further filing information on then
public reference rooms. Our SEC filings are also available to the public on the
SEC's website at http://www.sec.gov.

                 Incorporation Of Certain Documents By Reference

The SEC allows us to "incorporate by reference" the information that we file
with it, meaning we can disclose important information to you by referring you
to those documents already on file with the SEC. The information incorporated by
reference is considered to be part of this prospectus, and information that we
file later with the SEC will automatically update and supersede this
information. We incorporate by reference the following documents:

                                       18



1. Our annual report on Form 10-KSB for the year ended June 30, 1998, filed on
   October 13, 1998, amended on April 12, 1999 and July 23, 1999.
2. Our annual report on Form 10-KSB for the year ended June 30, 1999, filed on
   October 12, 1999.
3. Our quarterly reports on Form 10-QSB for the following fiscal quarters:
    (a) December 31, 1999, filed on February 18, 2000;
    (b) September 30, 1999, filed on November 17, 1999;
    (c) March 31, 1999, filed May 20,1999 and amended on July 22, 1999;
    (d) December 31, 1998, filed on February 19,1999 and amended on May 21,
        1999; and
    (e) September 30, 1998, filed on November 13, 1999 and amended on April 21,
        1999.


We also incorporate by reference any future filings made with the SEC under
Sections 13 (a), 13 (c), 14 or 15 (d) of the Securities Act of 1934, as amended,
prior to the termination of the offering to which this prospectus relates.

You may request a copy of any of these filings, at no cost, by writing or
calling us at the following address:

                  Imaging Diagnostic Systems, Inc.
                  6531 NW 18th Court
                  Plantation, Florida 33313.
                  Telephone number (954) 581-9800.
                  Attn:  Investor Relations


                   Information With Respect To The Registrant

The information required to be disclosed in the registration statement
pertaining to this prospectus is incorporated by reference, including, among
other documents, our latest Form 10-KSB, as amended, and Form 10-QSB, as
amended, which are both being delivered with this prospectus. See "Documents
Incorporated by Reference", "Prospectus Summary", "Risk Factors" and "Material
Changes."

           Management's Discussion And Analysis Of Financial Condition
                            And Results Of Operations

The information required for this Post Effective Amendment No. 4 to Form S-2,
including our financial statements and notes to the financial statements,
Management's Discussion and Analysis of Financial Condition and Results of
Operations for the fiscal year ended June 30, 1999, is incorporated by reference
to our annual report on Form 10-KSB filed with the SEC on October 12, 1999.


                                       19


                                Material Changes

Executive Compensation

The following table represents the compensation awarded to, earned by or paid to
our chief executive officer and other executive officers for services rendered
to us from 1997 to 1999. No other person during this time who served as one of
our executive officers had a total annual salary and bonus in excess of
$100,000.



                         Summary Of Compensation Table




                                 ANNUAL COMPENSATION                            LONG-TERM COMPENSATION

Name & Principal
Position                         Year       Salary (2)       Other Annual      Restricted     Securities/Underlying
                                                             Compensation      Stock Awards       Option/SARs (1)
                                                                                     

Richard J. Grable, CEO            1997        $289,779       $115,000            $268,000         22,883
and Director                      1998        $286,225            -0-                 -0-        534,602
                                  1999        $286,225            -0-                 -0-        458,333
Linda B. Grable, President        1997        $ 97,451       $115,000            $268,000         22,883
and Director                      1998        $119,070            -0-                 -0-        534,602
                                  1999        $119,070            -0-                 -0-        458,333
Allan L. Schwartz, Exec           1997        $111,534       $115,000            $268,000        130,410
VP, CFO and Director              1998        $119,070            -0-                 -0-        534,602
                                  1999        $119,070            -0-                 -0-        458,333



(1)  The aggregate dollar value of the 1998 and 1999 options, based on the
     averaged high and low price on June 30, 1999 are as follows: Richard J.
     Grable, $341,321; Linda B. Grable, $341,321; and Allan L. Schwartz,
     $341,321.
(2)  The salaries include compensation, which has been accrued and not paid as
     of February 28, 2000 in the amounts as follows: Richard J. Grable, $47,704;
     Linda B. Grable, $19,890 and Allan L. Schwartz, $19,806.


Employment Agreements

We entered into five-year employment agreements with Mr. Richard J. Grable, Mr.
Allan L. Schwartz and Ms. Linda B. Grable that expire on August 29, 2004.
According to the terms of their respective employment agreements, base annual
salaries, after giving effect to cost of living adjustments, are as follows:
Richard J. Grable, $286,224.96; Linda B. Grable, $119,069.52; and Allan L.
Schwartz, $119,069.52. In addition, Messrs. Grable and Schwartz and Ms. Grable
each receive a car allowance of $500 per month. Each employment agreement
provides for bonuses, health insurance, car allowance, and related benefits, and
a cost of living adjustment of 7% per annum. No bonuses have been paid to date.

The following table explains information regarding the Options/SARs we granted
to management for the fiscal year ended June 30, 1999.


                     Option/SAR Grants in Last Fiscal Year




             No. of Securities    % of Total Options    Exercise or   Market Price
             Underlying Options  Granted to Employees   Base Price     On Date of       Expiration
Name         Granted              In Fiscal Year       ($/Share)      Grant             Date
                                                                           
Richard J.     250,000              16%                $.17           $.44             7/5/03
Grable         208,333              14$                $.48           $.44             7/5/03

Linda B.       250,000              16%                $.17           $.44             7/5/03
Grable         208,333              14$                $.48           $.44             7/5/03

Allan L        250,000              16%                $.17           $.44             7/5/03
Schwartz       208,333              14$                $.48           $.44             7/5/03


                                       20



Stock Option Plans

For the fiscal year ended June 30, 1999, all of our executive officers were
participants in our 1995 stock option plan. The plan was approved by our board
of directors and adopted by the shareholders at the March 29, 1995 annual
meeting. The plan provides for the granting, exercising and issuing of incentive
options pursuant to Internal Revenue Code, Section 422. We may grant incentive
stock options to purchase up to 5% of our issued and outstanding common stock at
any time. Our board of directors has direct responsibility for the
administration of the plan.

On August 30, 1999, we established an equity incentive plan. The shareholders
must approve this plan within 1 year. The maximum number of shares that can be
granted under this plan is 15,000,000 shares of common stock and 5,000,000
shares of preferred stock. The series, rights and preferences of the preferred
stock are to be determined by our board of directors. This plan also includes
any stock available for future stock rights under our 1995 stock option plan.

Under both of these plans, the exercise price of the incentive options to
employees must be equal to at least 100% of the fair market value of the common
stock, as of the date of grant. The exercise price of incentive options to
officers, or affiliated persons, must be at least 110% of the fair market value
as of the date of grant.

According to stock option agreements, Mr. Richard J. Grable, Mr. Allan L.
Schwartz and Mrs. Linda B. Grable each have an option to purchase 2,500,000
shares of common stock or preferred stock. These options vest in equal
installments over a five-year period at an exercise price of $.21 per share
(110% of the fair market value of the shares on the date of grant). These stock
option agreements terminate on August 30, 2003.

         Security Ownership of Certain Beneficial Owners and Management

The following table shows the beneficial ownership of our common stock as of
February 28, 2000 regarding:

(i)      each person that we know of who beneficially owns more than 5% of the
         outstanding shares of our common stock,
(ii)     each current director and executive officer, and
(iii)    all executive officers and directors as a group.

The actual number of shares of common stock held by Richard Grable and Linda
Grable, without giving effect to options, are 11,494,540 and 3,572,300 shares,
respectively. Both Richard Grable and Linda Grable specifically disclaim any
beneficial interest in each other's shares.


Name and Address             Number of Shares Owned     % of Outstanding
of Beneficial Owner          Beneficially (1)(2)        Shares of Common Stock
- -------------------          -----------------------  ----------------------

Richard J. Grable            16,983,506(3)                   17.5%
c/o 351 NW 18th Court
Plantation, FL 33313

Linda B. Grable              16,983,506(4)                   17.5%
c/o 6351 NW 18th Court
Plantation, FL 33313

Allan L. Schwartz             4,320,893(5)                    4.4%
c/o 6351 NW 18th Court
Plantation, FL 33313

All officers and directors   21,304,399 (6)                  21.9%
as a group (3 persons)

                                       21


(1)   Except as indicated in the footnotes to this table, based on information
      provided by such persons, the persons named in the table above have sole
      voting power and investment power with respect to all shares of common
      stock shown beneficially owned by them.

(2)   Percentage of ownership is based on 97,200,698 shares of common stock
      outstanding as of February 28, 2000 plus each person's options that are
      exercisable within 60 days. Shares of common stock subject to stock
      options that are exercisable within 60 days as of February 28, 2000 are
      deemed outstanding for computing the percentage of that person and the
      group.

(3)   Includes 958,333 shares subject to options and 3,572,300 shares owned by
      the wife of Richard J. Grable, Linda B. Grable, of which he disclaims
      beneficial ownership.
(4)   Includes 958,333 shares subject to options and 11,494,540 shares owned by
      the husband of Linda B. Grable, Richard J. Grable, of which she disclaims
      beneficial ownership.
(5)   Includes 958,333 shares subject to options and 9,000 shares owned by the
      wife of Allan L. Schwartz, Carolyn Schwartz, of which he disclaims
      beneficial ownership.
(6)   Includes 1,916,666 shares subject to options held by Linda and Richard
      Grable and 958,333 shares subject to options held by Allan Schwartz. Also
      includes 9,000 shares owned by the wife of Allan L. Schwartz, Carolyn
      Schwartz, of which he disclaims beneficial ownership.


                 Certain Relationships and Related Transactions

Richard J. Grable and Linda B. Grable are husband and wife. They are each
"control persons" as a result of their control of a majority voting power of our
outstanding stock. Both parties disclaim, however, any beneficial interest or
ownership in the shares owned by the other party.


In September and October 1998, Linda Grable, our president, personally
guaranteed three promissory notes we issued to third parties. Ms. Grable
received no compensation for these guarantees. As of the date of the
registration statement, all three notes have been repaid.


In June 1998, we finalized an exclusive patent license agreement with Richard
Grable. Mr. Grable is the owner of the patent, which encompasses the technology
for the CTLM(TM). Our company and Mr. Grable had previously entered into an oral
agreement for the exclusive license for the patent that was never memorialized
in written form. The term of the license is for the life of the patent (17
years) and any renewals, subject to termination, under specific conditions. As
consideration for this license, we issued to Mr. Grable 3,500,000 shares of
common stock and were required to issue to him an additional 3,500,000 shares in
June 1999. In addition, we have agreed to pay Mr. Grable a royalty based upon
the net selling price (the dollar amount earned from our sale, both
international and domestic, before taxes minus the cost of the goods sold and
commissions or discounts paid) of all products and goods in which the patent is
used, before taxes and after deducting the direct cost of the product and
commissions or discounts paid. During the second year of the agreement there is
a minimum cash royalty provision of $250,000 payable at the end of the second
year which Mr. Grable has deferred until we commence sales and delivery of
CTLM(TM) systems.


Since October 1998, we have accrued $87,440 in salaries payable to our executive
officers and directors, Richard J. Grable, Allan Schwartz and Linda B. Grable,
due to our lack of working capital.


In January 1999 and February 1999, Richard Grable, sold an aggregate of 831,743
shares of our common stock owned by him in excess of 4 years, according to Rule
144 and lent the aggregate proceeds of approximately $347,775 directly to us. In
January 1999, February 1999 and March 1999, Linda Grable, also sold an aggregate
of 520,000 shares of our common stock owned by her in excess of 4 years,
according to Rule 144 and lent the aggregate proceeds of approximately $166,618
directly to us and in December 1998, January 1999 and February 1999, Allan
Schwartz, sold an aggregate of 820,000 shares owned by him in excess of 4 years,
according to Rule 144 and lent the aggregate proceeds of approximately $359,707
directly to us. All of these loans were interest free and were evidenced by
promissory notes. These promissory notes were due on January 30, 1999, February
28, 1999, March 31, 1999, and April 30, 1999, respectively. The net proceeds
were recorded as a loan payable to each respective lender.

A meeting of our board of directors was held on May 12, 1999 to review and act
upon the previously adopted schedule of repayment of the loans, interest and
potential tax liability. Based on an opinion of the Grables' personal outside

                                       22


counsel and upon advice of a tax advisor, our board voted to rescind the
previously adopted resolution. The new resolution authorized the repayment of
the December, January, February, and March promissory notes in full by the
issuance of shares equal to the number of shares sold. The restricted shares
issued as repayment for the loans bear registration rights. Since the loans were
repaid on a share for share basis with no other consideration, the Grables have
been advised that there is no capital gain and therefore no tax liability.
Messrs. Grable, Schwartz and Ms. Grable received 831,743, 820,000, and 520,000
shares of our restricted common stock, respectively, as payment in full for the
loans made between December 1998 and March 1999.

In May 1999, Messrs. Grable and Schwartz each sold 110,000 shares, respectively,
of our common stock owned by them in excess of 4 years, according to Rule 144
and lent the aggregate proceeds of approximately $91,759 directly to us. The
loans were evidenced by interest free promissory notes, which were due, and
payable on June 30, 1999. In June 1999, Messrs. Grable and Schwartz each sold
280,000 and 315,020 shares, respectively, of our common stock owned by them in
excess of 4 years, according to Rule 144 and lent the aggregate proceeds of
approximately $201,795 directly to us. The loans were evidenced by interest free
promissory notes, which were due, and payable on July 31, 1999. In July 1999,
Mr. Schwartz sold 500,000 shares of our common stock owned by him in excess of 4
years, according to Rule 144 and lent the aggregate proceeds of approximately
$137,241 directly to us. The loan was evidenced by interest free promissory
notes, which were due, and payable on August 31, 1999. All of these loans were
interest free and were evidenced by promissory notes. The May, June and July
promissory notes were due on June 30, 1999, July 31, 1999 and August 31, 1999,
respectively. The net proceeds were recorded as a loan payable to each
respective lender. Messrs. Grable and Schwartz received 390,000 and 925,500
shares of our restricted common stock, respectively, as payment in full for the
loans made between May 1999 and July 1999.

                         Sale of Unregistered Securities

Private Placement of Preferred Stock

We have had to rely on the private placement of preferred and common stock to
obtain working capital. In deciding to issue preferred stock pursuant to the
private placements, we took into account the number of common shares authorized
and outstanding, the market price of the common stock at the time of each
preferred sale and the number of common shares the preferred stock would have
been convertible into at the time of the sale. At the time of each private
placement of preferred stock there were enough shares, based on the price of our
common stock at the time of the sale of the preferred to satisfy the preferred
conversion requirements. Although our board of directors tried to negotiate a
floor on the conversion price of each series of preferred stock prior to sale,
it was unable to do so. In order to obtain working capital we will continue to
seek capital through debt or equity financing which may include the issuance of
convertible preferred stock whose rights and preferences are superior to those
of the common stock holders. We will endeavor to negotiate the best transaction
possible taking into account the impact on our shareholders, dilution, loss of
voting power and the possibility of a change-in-control. However, in order to
satisfy our working capital needs, we may be forced to issue convertible
securities and debentures with no limitations on conversion. In addition, the
dividends on the preferred stock affect the net losses applicable to
shareholders. There are also applicable adjustments as a result of the
calculation of the deemed preferred stock dividends because we have entered into
contracts providing for discounts on the preferred stock when it is converted.
As a result of the dividends on cumulative preferred stock, the net loss per
common shareholder has increased from $.07 per share for the fiscal year ending
June 30, 1998 to $.02 per share for the fiscal year ending June 30, 1999. The
cumulative total is $.21 per share.


In the event that we issue preferred stock without a limit on the number of
shares that can be issued upon conversion and the price of our common stock
decreases, the percentage of shares outstanding that will be held by preferred
holders upon conversion will increase accordingly. The lower the market price
the greater the number of shares to be issued to the preferred holders, upon
conversion, thus increasing the potential profits to the holders when the price
per share increases and the holders sell the common shares. In addition, the
sale of a substantial amount of preferred stock to relatively few holders could
cause a possible change-in-control. In the event of a voluntary or involuntary
liquidation while the preferred stock is outstanding, the holders will be
entitled to a preference in distribution of our property available for
distribution equal to $10,000 per share. The following table summarizes certain
information with regard to the Series B, C, D, E, F, G, H, and I preferred stock
as of February 28, 2000.

                                       23






                                 Series B   Series C     Series D     Series E     Series F     Series G     Series H     Series I
                                                                                                      
Regulation D or S                Reg D.       Reg. S       Reg. S       Reg. S       Reg. S       Reg. D       Reg. D       Reg. D
No. of Pfd. Shares                  450          210           50           50           75           35          100          138
Price per Pfd. share        $    10,000   $   10,000   $   10,000   $   10,000   $   10,000   $   10,000   $   10,000   $   10,000
Total Offering              $ 4,500,000   $2,100,000   $  500,000   $  500,000   $  750,000   $  350,000   $1,000,000   $1,380,000
Placement Fee-Cash                 None   $  220,500   $    5,000   $    5,000   $   50,000         None   $   10,000         None
Placement Fee-Stock                None         None   4 Pfd. Sh.   4 Pfd. Sh.         None   3 Pfd. Sh.   8 Pfd. Sh.         None
Avg. Bid & Ask Price
at Time of Issuance:
   Common Stock             $      4.70   $     1.63   $     1.22   $     1.09   $     1.31   $     0.34   $     0.56   $     0.38
   Conversion Price         $      3.85   $     1.22   $   0.9150   $   0.8198   $   0.9170   $   0.2550   $     0.42   $   0.2850
# of Conversion Shares
at Time of Issuance           1,168,831    1,721,311      546,448      609,905      817,884    1,490,196    2,571,429    4,842,105
Option to Repay
Dividends in Cash
or Stock                            Yes           No           No           No          Yes           No           No          Yes
4.99% Ownership Limit               Yes          Yes          Yes          Yes          Yes          Yes          Yes          Yes
# of Outstanding
Preferred Shares                     60          -0-          -0-          -0-          -0-          -0-          -0-          123
Total # of Shares Issued
Upon Conversion to Date      30,444,719    2,646,527    1,717,134    1,282,826    3,410,571    3,834,492   11,161,725      579,177




Series B Preferred Stock

In December 1996, Weyburn Overseas Limited and Goodland International Investment
Ltd. purchased the Series B preferred stock offering pursuant to Regulation D.
Net proceeds were used for working capital and the continuous research,
development and testing of our CTLM(TM). The conversion rate is 82% of the
average closing price over a five-day period prior to conversion.

On April 6, 1999, the Series B preferred stock was sold by the Series B
preferred holders to Charlton Avenue, LLC, an unaffiliated third party with no
prior relationship to us or the Series B preferred holders. On April 6, 1999, we
also entered into a subscription agreement with Charlton whereby we agreed to
issue to Charlton 138 shares of our Series I, 7% convertible preferred stock as
discussed below.

Series C Preferred Stock

On October 6, 1997, we finalized the private placement to Austost Anstalt
Schaan, UFH Endowment, Inc., Chris Baum, Avalon Capital Limited, Dominion
Capital, Ltd. and The Cuttyhunk Fund Limited, of our Series C convertible
preferred stock and warrants to purchase up to 105,000 shares of our common
stock at an exercise price of $1.63 per share and to purchase up to 50,000
warrants at an exercise price of $1.562 per share. These preferred shares were
convertible, at any time, commencing 45 days from the date of issuance and for a
period of 3 years thereafter, without additional consideration. The number of
fully paid and non-assessable shares of our common stock, no par value, issued
upon conversion was determined by dividing (i) the sum of $10,000 by (ii) the
conversion price in effect at the time of conversion. The conversion price was
equal to 75% of the average closing price of our common stock for the five-day
trading period ending on the day prior to the date of conversion; provided,
however, in no event was the conversion price to be greater than $1.222 per
share.

According to the Regulation S sale documents, we were also required to escrow an
aggregate of 3,435,583 shares of our common stock. The shares underlying the
preferred stock and warrants were entitled to demand registration rights in the
event that Regulation S was amended prior to the conversion of the preferred
stock. This right expired upon conversion.

                                       24


Series D Preferred Stock

On January 9, 1998, we finalized the private placement to Avalon Capital Ltd. of
our Series D convertible preferred stock and warrants to purchase up to 25,000
shares of our common stock at an exercise price of $1.22 per share.

These preferred shares were convertible, at any time, commencing 45 days from
the date of issuance and for a period of three years thereafter, without
additional consideration. The conversion price was equal to 75% of the average
closing price of our common stock for the five-day trading period ending on the
day prior to the date of conversion. The shares underlying the preferred stock
and warrants were entitled to demand registration rights in the event that
Regulation S was amended prior to the conversion of the preferred stock. This
right expired upon conversion.

Net proceeds to us of $495,000 were used for working capital and the continuous
research, development and testing of the CTLM(TM).

Series E Preferred Stock

On February 5, 1998, we finalized the private placement to Austost Anstalt
Schaan and Balmore Funds S.A. of our Series E convertible preferred stock and
warrants to purchase up to 25,000 shares of our common stock at an exercise
price of $1.093 per share

These preferred shares were convertible, at any time, commencing 45 days from
the date of issuance and for a period of three years thereafter without
additional consideration The number of fully paid and non-assessable shares of
our common stock, no par value, issued upon conversion was determined by
dividing (i) the sum of $10,000 by (ii) the conversion price in effect at the
time of conversion. The conversion price is equal to 75% of the average closing
price of our common stock for the five-day trading period ending on the day
prior to the date of conversion.

The shares underlying the preferred stock and warrants were entitled to demand
registration rights in the event that Regulation S was amended prior to the
conversion of the preferred stock. This right expired upon conversion.

Net proceeds to us of $495,000 were used for working capital and the continuous
research, development and testing of the CTLM(TM).

Series F Preferred Stock

On February 20, 1998, we finalized a private placement to Dominion Capital Fund,
LTD and Canadian Advantage, LTD of our Series F convertible preferred stock

The preferred shares pay a dividend of 6% per annum, payable in common stock at
the time of each conversion and were convertible, at any time, commencing May
15, 1998 and for a period of two years thereafter without additional
consideration. The number of fully paid and non-assessable shares of our common
stock, issued upon conversion was determined by dividing (i) the sum of $10,000
plus any earned dividends by (ii) the conversion price in effect at the time of
conversion. The conversion price is equal to 70% of the average closing price of
our common stock for the five-day trading period ending on the day prior to the
date of conversion. The shares underlying the preferred stock are entitled to
demand registration rights in the event that Regulation S was amended prior the
conversion of the preferred stock. According to these demand rights the
1,971,375 shares of common stock issued upon the conversion of the Series F
preferred are being registered on behalf of the holders according to a
registration statement on Form S-2.

Net proceeds to us of $700,000 were used for working capital and the continuous
research, development and testing of the CTLM(TM).

                                       25


Series G Preferred Stock

On March 17, 1999, we finalized a private placement to Amro International, S.A.,
Nesher Inc., Hewlett Fund, and Guaranty & Finance Ltd., of our Series G
convertible preferred stock and two year warrants to purchase 65,625 shares of
our common stock at an exercise price of $.50 per share. Net proceeds of
$350,000 were used for working capital and the continuous research, development
and testing of the CTLM(TM).


The Series G convertible preferred stock has no dividend provisions. The number
of fully paid and non-assessable shares of common stock to be issued upon
conversion will be determined by dividing (i) the sum of $10,000 by (ii) the
conversion price in effect at the time of conversion. The conversion price is
equal to the lesser of (i) 75% discount to the two lowest bids in a ten-day
period immediately preceding the conversion date or (ii) $.54. There is no floor
on the conversion price and no time limits on conversion. The shares can be
converted at any time without additional consideration According to the terms of
the registration rights agreement we were required to register 100% of the
number of shares that would be required to be issued if the preferred stock were
converted on the day before the filing of the registration statement. In the
event that the registration statement was not filed within 14 days from the
closing or that it was not declared effective within 60 days, we are required to
pay the Series G preferred holders, as liquidated damages, for failure to have
the registration statement declared effective, not as a penalty, 3% of the
principal amount of the securities sold for each 30-day period thereafter until
we procure registration of the securities. In the event that the registration
statement is not declared effective within 120 days, the Series G preferred
holders have the right to force us to redeem the Series G preferred at a
redemption price of 120% of the face value of the preferred. According to the
registration rights agreement, 100% of that number of shares that would be
required to be issued if the Series G preferred were converted on the day before
the filing of the registration statement, 1,801,803, are being registered on
behalf of the holders.


Series H Preferred Stock

On June 2, 1998, we finalized a private placement to Austost Anstalt Schaan and
Balmore Funds S.A. of our Series H convertible preferred stock and 75,000 A
warrants and 50,000 B warrants. The A and B warrants are exercisable at $1.00
and $1.50 per share, respectively. Net proceeds of $990,000 were used for
working capital and the continuous research, development and testing of the
CTLM(TM).


The number of fully paid and non-assessable shares of common stock to be issued
upon conversion will be determined by dividing the (i) the sum of $10,000 by
(ii) the conversion price in effect at the time of conversion. The conversion
price is equal to the lesser of $.53 and 75% of the lowest closing bid price of
our common stock for the ten-day trading period ending on the day prior to the
date of conversion. There is no floor on the conversion price and no time limits
on conversion. The shares can be converted at any time without additional
consideration. According to the terms of the registration rights agreement, as
amended, we have registered herein 100% of that number of shares that would be
required to be issued if the preferred stock were converted on the day before
the filing of the registration statement, 3,038,020 shares. We are in technical
default of the registration rights agreement, which required the registration
statement to be declared effective by October 2, 1998. According to the
registration rights agreement, we are required to pay the Series H preferred
holders in cash or in stock, as liquidated damages for failure to have the
registration statement declared effective, not as a penalty, 2% of the principal
amount of the securities sold for first 30-day period, and 3% of the principal
amount of the securities for each 30-day period thereafter until we procure
registration of the securities. According to the registration rights agreement,
liquidated damages of $169,000 have accrued as of March 31, 1999. We are
presently unable to comply with the liquidated damage provision payment and no
assurances can be given that we will be able to do so in the future. On March
25, 1999, we issued 424,242 shares of restricted common stock with registration
rights to the Series H preferred shareholders in lieu of cash for liquidated
damages through March 2, 1999. The value of these shares was $140,000, leaving a
balance of $29,000 due for liquidated damages through March 31, 1999. We have
the option of paying the accrued dividends and liquidated damages in common
stock.


                                       26


Series I Preferred

On April 6, 1999, we also entered into a subscription agreement with Charlton
where we agreed to issue Charlton 138 shares of our Series I, 7% convertible
preferred stock. Our board of directors established the value of the Series I
preferred at $10,000 per share. Consideration for the subscription was paid as
follows:

   (i)   payments of all of the accumulated dividends (approximately $725,795)
         in connection with the Series B preferred stock;
   (ii)  settlement and dismissal, with prejudice, of all litigation concerning
         the Series B preferred stock and the exchange of mutual releases;
   (iii) cancellation of 112,500 warrants that were issued with the Series B
         preferred stock; and
   (iv)  amendment of the Series B designation to impose a limitation on the
         owner(s) of the Series B preferred stock to ownership of not more than
         4.99% of our outstanding common stock at any one time.

The Series I preferred pay a 7% premium, to be paid in cash or freely trading
common stock in our sole discretion, at the time of each conversion. The number
of fully paid and non-assessable shares of common stock to be issued upon
conversion will be determined by dividing (i) the sum of $10,000 by (ii) the
conversion price in effect at the time of conversion. The conversion price is
equal to 75% of the average closing price of our common stock for the five-day
trading period ending on the day prior to the date of the conversion.


According to the registration rights agreement, 100% of that number of shares
that would be required to be issued if the I preferred stock were converted on
the day before the filing of the registration statement, 5,947,763, are being
registered on behalf of the holders.

Private Placement of Convertible Debentures

We have also had to rely on the private placement of convertible debentures to
obtain working capital. In deciding to issue convertible debentures, the board
of directors took into account many of the same considerations it did when it
decided to issue preferred stock. The following table summarizes certain
information with regard to our outstanding convertible debentures as of February
28, 2000.


                                       27



                               Charlton Debentures       Spinneret Debentures

Regulation D or S                           Reg. D             Reg. D
Annual Dividend %                                7                  7
# Tranches (up to)                               3                  3
Maximum Proceeds                       $ 3,080,000          $  51,000
Placement Fee-Cash                            None               None
Placement Fee-Stock                           None               None
Avg. Bid & Ask Price
at Time of Issuance:
   Common Stock                           $    .39          $   .0875
   Conversion Price                       $    .29          $   .0656
# of Conversion Shares
at Time of Registration                  4,740,971                  0
Option to Repay
Interest in Cash
or Stock                                       Yes                Yes
4.99% Ownership Limit                          Yes                Yes
% of Outstanding
Debentures                                     100                100
Total # of Shares Issued
Upon Conversion to Date                          0                  0
Automatic Conversion Date                  2 years            2 years
                                        from issuance      from issuance


Convertible Debentures - Charlton

We also entered into a subscription agreement with Charlton, where Charlton
purchased a convertible debenture for $1,100,000. In addition, we may draw down
a second tranche in the amount of $825,000 anytime 30 days after the effective
date of the registration statement as long as we maintain an average closing bid
price of $.45 for the 10 trading days immediately prior to the date we request
the second tranche funding. We may draw down a third tranche in the amount of
$825,000 anytime 60 days after the effective date of the registration statement
as long as we maintain an average closing bid price of $.45 for the 10 trading
days immediately prior to the date we request the third tranche funding. When
concluded, assuming all the conditions set forth above are met, the proceeds
from the original debenture offering will be $2,750,000. We entered into an
additional subscription agreement with Charlton for tranches totaling $330,000.


The debentures are secured by a mortgage on our corporate office building. The
mortgage will be released after the registration statement covering the common
stock underlying the debentures has been declared effective and upon the earlier
of (a) the day we qualify for listing on AMEX or NASDAQ, as long as said listing
requirements are not being met through a reverse split of our common stock, and
(b) 180 days from the date we receive the third tranche funding, as described
above.

The number of fully paid and non-assessable shares of common stock, no par
value, to be issued upon conversion will be determined by dividing (i) the sum
of $10,000 by (ii) the conversion price in effect at the time of conversion. The
conversion price is equal to 75% of the average closing price of our common
stock for the five-day trading period ending on the day prior to the date of the
conversion. The debentures can be converted at any time without additional
consideration.

In the event of a voluntary or involuntary liquidation while any of the
debentures are outstanding the holders are entitled to a preference in
distribution of our property available for distribution equal to the debentures
then outstanding principal and interest and will be able to foreclose against
the mortgage.

                                       28



The proceeds from the sale of the Charlton convertible debenture ($1,100,000)
and any subsequent tranches of $1,980,000 totaling $3,080,000 will be used for
clinical trials expenses and working capital. As of the date of the registration
statement, no portion of the convertible debentures have been converted.


Convertible Debenture - Spinneret

We entered into a subscription agreement with Spinneret, LTD., where Spinneret
purchased a convertible debenture for $51,000. The sum of $1,000 was paid upon
issuance of the debenture for legal fees. The sum of $50,000 was advanced as a
loan on July 12, 1999, and the debenture was issued in the principal amount of
$51,000 on August 11, 1999. The debenture is due on August 11, 2001.


The number of fully paid and non-assessable shares of common stock, no par
value, to be issued upon conversion will be determined by dividing (i) the sum
of $10,000 by (ii) the conversion price in effect at the time of conversion. The
conversion price is equal to 75% of the average closing price of our common
stock for the five-day trading period ending on the day prior to the date of the
conversion. The debenture can be converted at any time without additional
consideration.


The proceeds from the sale of the debenture will be used for working capital. As
of the date of this report no portion of the convertible debenture has been
converted.

Private Placement of Common Stock

In August 1998, we sold 200,000 shares of restricted common stock to Frank
Giambroni, an unaffiliated third party, pursuant to Regulation D for an
aggregate purchase price of $60,000. No placement fee was paid in connection
with this offering. Net proceeds of $59,990 were used to pay the salaries of our
non-executive employees. At the time the placement was concluded, the average
bid and ask price of our common stock was approximately $.28 per share. These
shares are being registered pursuant to the registration statement.


In September 1998, we sold one unit, consisting of a $250,000 promissory note
and 200,000 shares of common stock, to Settondown Capital International, Ltd.,
an unaffiliated third party, pursuant to Regulation D, for an aggregate purchase
price of $250,000. These shares are included in the registration statement. At
the time the sale occurred, the average bid and ask price of our common stock
was $.595. The note bore interest at the rate of 12% per annum. In connection
with this sale, we paid the sum of $23,000 to Manchester Asset Management, Ltd.,
an unaffiliated third party, as a placement fee. Net proceeds of $227,000 were
used as follows: (i) salaries, $21,849 to executive officers and $62,447 to
employees; (ii) machinery and equipment, $5,959; (iii) operating expenses,
$55,240 for inventory parts and assemblies, employee health insurance, workers
compensation and property insurance; and (iv) working capital, $82,000. On
December 30, 1999, we repaid the promissory note in full from Settondown Capital
International, Ltd. with restricted stock. The total principal and interest
accrued was $359,203.33. For the note, we issued a total of 2,112,961 shares of
restricted stock.

In October 1998, we sold one unit, consisting of a $100,000 promissory note and
80,000 shares of common stock, to Avalon Capital, Inc., an unaffiliated third
party, according to Regulation D, for an aggregate purchase price of $100,000.
These shares are included in the registration statement. No placement fee was
paid in connection with this offering, however, we did issue 5,000 shares of
common stock to Goldstein, Goldstein and Reis LLC, an unaffiliated third party,
as payment for the attorney's fees incurred by the purchaser pursuant to the
sale. At the time the placement was concluded, the average bid and ask price of
our common stock was approximately $.50 per share. The note bore interest at the
rate of 12% per annum. Net proceeds of $100,000 were used as follows: (i)
salaries, $21,849-executive officers and $62,448-employees; and (ii) working
capital, $15,703. On December 30, 1999, we repaid the promissory note in full
from Avalon Capital, Inc. with restricted stock. The total principal and
interest accrued was $119,041.67. For the note, we issued a total of 700,245
shares of restricted stock.

In October 1998, we sold one unit, consisting of a $250,000 promissory note and
210,000 shares of common stock, to GCA Strategic Investment Fund Ltd., an
unaffiliated third party, pursuant to Regulation D, for an aggregate purchase
price of $210,000. These shares are included in the registration statement. At
the time the placement was concluded, the average bid and ask price of our
common stock was approximately $.43 per share. The note bore interest at the
rate of 12% per annum. In connection with the sale, we paid the sum of $23,000

                                       29


to LKB Financial LLC, an unaffiliated third party, as a placement fee. Net
proceeds of $210,000 were used as follows: (i) salaries, $21,849-executive
officers and $62,448-employees; and (ii) working capital, $125,703. The note,
and all accrued interest, was paid in January 1999. Our officers provided the
payment for this loan through the sale of a portion of their shares of our
common stock.

In November 1998, we issued 286,000 shares of common stock as partial
consideration for a $115,000 aggregated loan to us by Deborah O'Brien, an
employee. At the time the loan was concluded, the average bid and ask price of
our common stock was approximately $.625 per share. We were obligated to repay
the lender the sum of $50,000. In January 1999, we issued a note evidencing this
indebtedness. The note bore interest at the rate of 7% per annum and was due and
payable upon demand. Net proceeds of $115,000 were used as follows: (i)
salaries, $21,849-executive officers and $62,447-employees; (ii) operating
expenses, $16,345-inventory parts and assemblies, employee health insurance,
workers compensation and property insurance; and (iv) working capital, $14,359.
On April 8, 1999, we paid the balance due on the loan of $47,396 to the lender.
These shares are included in the registration statement.

As of the date of this registration statement, we have entered into loans with
Balmore Funds S.A. for the aggregate sum of $100,000 and signed promissory notes
with an interest rate of 15% per annum. These notes were guaranteed by Richard
J. Grable and by Linda B. Grable. On December 30, 1999, we agreed to pay all the
promissory notes in full from Balmore funds S.A. with restricted stock. The
total principal and interest accrued was $104,802.08. For the notes, we will
issue a total of 616,483 shares of restricted stock. We also entered into loans
with Austost Anstalt Schaan for the aggregate sum of $50,000 and signed
promissory notes with an interest rate of 15% per annum. These notes were also
guaranteed by Richard J. Grable and by Linda B. Grable. On December 30, 1999, we
agreed to pay all the promissory notes in full from Austost Anstalt Schaan with
restricted stock. The total principal and interest accrued was $53,822.92. For
the notes, we will issue a total of 316,605 shares of restricted stock.

On January 26, 2000, we entered into a consulting agreement with Anthony
Giambrone, an unaffiliated third party, which provided payment for services in
warrants exercisable into 500,000 shares of common stock at a price of $0.93 per
share.


                                       30


                           Price Range On Common Stock

Our common stock is traded on the NASDAQ OTC Bulletin Board under the symbol
IMDS. There has been trading in our common stock since September 20, 1994. The
following table sets forth, for each of the fiscal periods indicated, the
high/low and low/low bid prices for the common stock, as reported on the OTC
Bulletin Board. These per share quotations reflect inter-dealer prices in the
over-the-counter market without real mark-up, markdown or commissions and may
not necessarily represent actual transactions.

     Quarter Ending                High/Low Bid          Low/Low Bid

     Fiscal Year 1996

     September 1995                    $1.69                 $0.56
     December 1995                     $4.31                 $0.56
     March 1996                        $8.00                 $2.56
     June 1996                         $7.38                 $2.50

     Fiscal Year 1997

     September 1996                    $3.93                 $2.25
     March 1997                        $4.00                 $2.50
     December 1996                     $4.50                 $1.44
     June 1997                         $3.06                 $2.44

     Fiscal Year 1998

     September 1997                    $2.69                 $1.44
     December 1997                     $1.56                 $0.60
     March 1998                        $1.23                 $0.61
     June 1998                         $1.39                 $0.40

     Fiscal Year 1999

     September 1998                    $0.56                 $0.21
     December 1998                     $1.00                 $0.35
     March 1999                        $0.59                 $0.34
     June 1999                         $0.47                 $0.28

     Fiscal Year 2000

     September 1999                    $0.33                 $0.11
     December 1999                     $0.80                 $0.08



On February 28, 2000, the closing trade price of the common stock as reported on
the OTC Bulletin Board was $3.8438 per share. As of such date, there were
approximately 745 holders of record of our common stock.


                                 Dividend Policy

To date, we have not declared or paid any dividends with respect to our capital
stock, and the current policy of our board of directors is to retain any
earnings to provide for our growth. Consequently, no cash dividends are expected
to be paid on our common stock in the foreseeable future.

                            Selling Security Holders

The selling security holders consist of common stock holders, the Series B, G, H
and I preferred holders and the holder of the convertible debentures. The
registration statement is a part of the prospectus being filed. The shares
offered in this prospectus are based on the various registration rights in the

                                       31


subscription agreement and registration rights agreements between the selling
security holders and us. We are unable to determine the exact number of shares
that will actually be sold according to this prospectus due to:

o    the ability of the selling security holders to determine when and whether
     they will sell any shares under this prospectus; and
o    the uncertainty as to how many of the warrants will be exercised and how
     many shares of common stock will be issued upon conversion of the
     convertible debenture and the Series B, G, H and I preferred stock.


The number of fully paid and non-assessable shares of common stock, no par
value, to be issued upon conversion of the convertible debenture and the
unconverted outstanding preferred stock will be determined by dividing (i) the
sum of $10,000 by (ii) the conversion price in effect at the time of conversion.
The conversion prices are as follows:

(i) Series B, 82% of the five-day average closing price;
(ii) Series I, 75% of the five-day average closing price; and
(iii) the debentures, 75% of the five-day average closing price.


Since the conversion price of each of the preferred shares is based on the
market price of our common stock prior to the date of conversion, the number of
shares subject to registration rights will increase if the market price of our
common stock decreases, and also will decrease if the market price increases.
See "Sale of Unregistered Securities-Financing/Equity Line of Credit.

The following table identifies each selling security holder based upon
information provided to us as of July 27, 1999, with respect to the shares
beneficially held by or acquirable by, each selling security holder, and the
shares of common stock beneficially owned by the selling security holders which
are not covered by this prospectus. No selling security holder or its
affiliates, except for Deborah O'Brien, have held any position, office, or other
material relationship with us. Ms. O'Brien is one of our employees and the niece
of Linda Grable. Ms. O'Brien's shares were issued as partial compensation for a
$115,000 loan to us.



                        Selling Security Holders' Table



NAME OF INVESTOR              COMMON SHARES   PREFERRED       COMMON SHARES    COMMON SHARES UNDERLYING   TOTAL NUMBER
                              SHARES OWNED    SHARES          UNDERLYING       WARRANTS                   OF SHARES TO
                              PRIOR TO        OWNED           PREFERRED                                   BE REGISTERED (2)
                              OFFERING                        /DEBENTURE (1)
                                                                                                
Balmore Funds SA
C/O Trident Trust Company       422,601        H-30             1,340,303         50,000                   1,600,783
(BVI) Limited
Trident Chambers
Road Town
Tortola British Virgin
Islands (3)
Austost Anstalt Schaan
Ladstrasse 163                  422,601        H-30             1,340,303         50,000                   1,600,783
9494 Furstentums
Vaduz, Liechtenstein (4)
Amro International, S.A.
c/o Ultra Finanz                    0          G-15               711,238         28,125                     739,363
Grossmunsterplatz 6
Zurich CH 8022,
Switzerland (5)
Nesher Inc.
Ragnalt Houise                      0          G-8                379,327         15,000                     394,327
18 Pell Road
Douglas, Isle of Man
IM14U2, United Kingdom (6)
Hewlett Fund
20 Adele Road                       0          G-5                237,079          9,375                     246,454
Brooklyn, New York (7)
Guaranty & Finance Ltd.
Vallarino PH                        0          G-7                331,911         13,125                     345,036
Calle 52, Panama (8)

                                       32


Libra Finance SA
Trident Chambers                    0          G-2                 94,832            0                        94,832
PO Box 146, Road Town
Tortola, British Virgin
Islands (9)
Dominion Capital Fund C/o
Thomas Kernaghan & Co. Ltd.     1,334,996       0                     0              0                     1,334,996
365 Bay Street
Toronto, Ontario (10)
Canadian Advantage Ltd.
Partnership                       636,379       0                     0              0                       636,379
C/o Thomas Kernaghan & Co.
Ltd.
365 Bay Street
Toronto, Ontario (11)
Scott Hugh Goldstein
C/o 65 Boradwat 10th Floor         25,000       0                     0              0                        25,000
New York, NY 10006
Sheldon E. Goldstein
C/o 65 Boradwat 10th Floor         25,000       0                     0              0                        25,000
New York, NY 10006
Deborah O'Brien
C/o 6531 NW 18th Court            287,800       0                     0              0                       286,000
Plantation, FL 33313
GCA Strategic Investment
Fund Ltd (12)                     210,000       0                     0              0                       210,000
106 Colony Park Drive
Suite 900
Cumming, GA 30040
Avalon Capital, Inc.
487 Sherwood Drive                 80,000       0                     0              0                        80,000
Salusaliton, CA 94965 (13)
Frank Giambroni
118 Park Ave.                     200,000       0                     0              0                       200,000
Bay Head, NJ 08742
Charlton Avenue, LLC
c/o Citco Trustees (Cayman)     1,931,123    Series B-390        16,016,427          0                    28,636,284
Limited                                      Series I-138         5,947,763          0
P.O. Box 31106 SMB                           Debenture            4,740,971
Grand Cayman
Cayman Island, British West
Indies (14)
Settondown Capital
International, Ltd                200,000      H-8                  357,414        25,000                    629,830
Charlotte House, Charlotte                     G-1                   47,416
Street
P.O. Box N 9204
Nassau, Bahamas (15)


(1)  Based on the number of shares that would be required to be issued if the
     preferred stock and debenture were converted as follows: Series B at
     $.2435, Series G at $.2109, Series H at $.22383, Series I at $.23202 and
     the debenture at $.23202 per share.
(2)  Where applicable, the amount being  registered is 100% of the number of
     common shares that would be required to be issued if the preferred stock
     or debenture was converted on the day before the filing of the
     registration  statement  plus common stock and the shares underling the
     warrants.
(3)  Of the 422,601 common shares, only 210,480 are being registered. Francois
     Morax and Matityahu  Kaniel are the directors of and have voting  control
     over Balmore Funds S.A.
(4)  Of the 422,601 shares, only 210,480 are being registered. Thomas Hackl and
     Peter Nakowitz are the directors of and have voting control over Austost
     Anstalt Schaan.
(5)  H.U. Bachofen is the director of and has voting control over AMRO
     International, S.A.
(6)  David Grin and John Clark are the directors of and have voting control over
     Nesher, Inc.

                                       33


(7)  Jenifer Spinner is the director of and has voting control over Hewlett
     Fund.
(8)  Dr. Durling is the director of and has voting control over Guaranty &
       Finance Ltd.
(9)  Seymour Braun is the director of and has voting control over Libra Finance
     SA.
(10) Livingston Asset Management Ltd. has voting control over Dominion
       Capital Fund.  David Sims has voting control over Livingstone.
(11) VHM Management Ltd. holds the voting shares of Canadian Advantage Ltd. Ian
     McKinnon and Mark Valentine have voting control over VMH.
(12) Prime Management LTD. has voting control of GCA Strategic Investment Fund
     LTD. John Kelly is the sole shareholder of and has voting control over
     Prime Management LTD.
(13) Wayne Coleson is the sole shareholder of and has voting control over Avalon
     Capital, Inc.
(14) Minglewood Capital LLC holds the voting shares of Charlton Avenue LLC. CTC
     Corporation LTD is the director of Minglewood. Michael Francombe is a
     director of and has voting control over CTC Corporation LTD.
(15) Anthony L.M. Inder Rieden is the director of and has voting control over
     Settondown Capital International, Ltd.


                                 Use Of Proceeds


         The selling security holders are selling all of the shares covered by
this prospectus for their own accounts. Accordingly, we will not receive any
proceeds from the resale of the shares. We will receive proceeds from the
exercise of the warrants, but, to date, none of the warrants have been
exercised. However, if all the warrants of which we are registering the
underlying shares on this prospectus were exercised as of February 28, 2000, we
would receive approximately $732,724 in proceeds. We would use any of these net
proceeds from the sale of these warrants for general corporate purposes,
including working capital. We will bear all expenses relating to this
registration.


                              Plan Of Distribution

         The shares may be sold or distributed from time to time by the selling
security holders or by pledgees, donees or transferees of, or successors in
interest to, the selling security holders, directly to one or more purchasers
(including pledgees) or through brokers, dealers or underwriters who may act
solely as agents or may acquire shares as principals, at market prices
prevailing at the time of sale, at prices related to such prevailing market
prices, at negotiated prices or at fixed prices, which may be changed. The
distribution of the shares may be effected in one or more of the following
methods:

o    ordinary brokers transactions, which may include long or short sales,

o    transactions  involving  cross  or block  trades  or  otherwise  on the OTC
     Bulletin Board,

o    purchases by brokers,  dealers or  underwriters  as principal and resale by
     such purchasers for their own accounts pursuant to this prospectus,

o    "at the market" to or through market makers or into an existing  market for
     the common stock,

o    in other ways not involving  market makers or established  trading markets,
     including direct sales to purchasers or sales effected through agents,

o    through  transactions  in  options,  swaps  or other  derivatives  (whether
     exchange listed or otherwise), or

o    any combination of the foregoing, or by any other legally available means.

In addition, the selling security holders may enter into hedging transactions
with broker-dealers who may engage in short sales of shares in the course of
hedging the positions they assume with the selling security holders. The selling
security holders may also enter into option or other transactions with
broker-dealers that require the delivery by such broker-dealers of the shares,
which shares may be resold thereafter pursuant to this prospectus.

                                       34


Brokers, dealers, underwriters or agents participating in the distribution of
the shares may receive compensation in the form of discounts, concessions or
commissions from the selling security holders and/or the purchasers of shares
for whom such broker-dealers may act as agent or to whom they may sell as
principal, or both (which compensation as to a particular broker-dealer may be
in excess of customary commissions). The selling security holders and any
broker-dealers acting in connection with the sale of the shares hereunder may be
deemed to be underwriters within the meaning of Section 2(11) of the Securities
Act of 1933, and any commissions received by them and any profit realized by
them on the resale of shares as principals may be deemed underwriting
compensation under the Securities Act of 1933, as amended. Neither we nor the
selling security holders can presently estimate the amount of such compensation.
We know of no existing arrangements between the selling security holders and any
other security holders, broker, dealer, underwriter or agent relating to the
sale or distribution of the shares.


We will not receive any proceeds from the sale of the common shares pursuant to
this prospectus. We have agreed to bear the expenses of the registration of the
shares, including legal and accounting fees, and such expenses are estimated to
be $30,874.


We have informed the selling stockholders that certain anti-manipulative rules
contained in Regulation M under the Securities Exchange Act of 1934, as amended,
may apply to their sales in the and have informed them of the need for delivery
of copies of this prospectus.

The selling security holders may also use Rule 144 under the Securities Act, to
sell the shares if they meet the criteria and conform to the requirements of
such rule.

                            Description Of Securities


Our authorized capital stock consists of 102,000,000 shares of capital stock of
which 100,000,000 shares are common stock, no par value, and 2,000,000 shares
are preferred stock, no par value. As of February 28, 2000, there were issued
and outstanding 97,200,698 shares of common stock, 60 shares of Series B
convertible preferred stock and 123 shares of Series I convertible preferred
stock, options to purchase 3,932,193 shares of common stock and warrants to
purchase 1,058,125 shares of common stock. In addition, Charlton has subscribed
for $3,080,000 in convertible debentures, $3,080,000 of which have been issued
to date, and Spinneret has a convertible debenture convertible into $51,000 of
shares of our common stock.


Common Stock

Holders of the common stock are entitled to one vote for each share held in the
election of directors and in all other matters to be voted on by shareholders.
There is no cumulative voting in the election of directors. Holders of common
stock are entitled to receive dividends as may be declared from time to time by
our board of directors out of funds legally available. In the event of
liquidation, dissolution or winding up, holders of common stock are to share in
all assets remaining after the payment of liabilities. The holders of common
stock have no preemptive or conversion rights and are not subject to further
calls or assessments. There are no redemption or sinking fund provisions
applicable to the common stock. The rights of the holders of the common stock
are subject to any rights that may be fixed for holders of preferred stock. All
of the outstanding shares of common stock are fully paid and non-assessable.

Preferred Stock

Our articles of incorporation authorize the issuance of preferred stock with
designations, rights, and preferences as may be determined from time to time by
the board of directors. The board of directors is empowered, without stockholder
approval, to designate and issue additional series of preferred stock with
dividend, liquidation, conversion, voting or other rights, including the right
to issue convertible securities with no limitations on conversion, which could
adversely affect the voting power or other rights of the holders of our common
stock, substantially dilute a common shareholder's interest and depress the
price of our common stock.

                                       35


            Disclosure Of Commission Position On Indemnification For

                           Securities Act Liabilities

         Section 607.0850 of the Florida General Corporation Act allows
companies to indemnify their directors, officers and agent against expenses,
judgments, fines and amounts paid in settlement under that conditions and
limitations described in that law.

              Article VII of our Articles of Incorporation authorizes us to
              indemnify our directors and officers in the following manner:

o    To the extent  permitted by law,  none of our directors or officers will be
     personally  liable to us or our  shareholders for damages for breach of any
     duty  owed  by  the  directors  and  officers  to us or  our  shareholders;
     provided,  that, to the extent  required by law, the directors and officers
     will not be relieved  from  liability  for any breach of duty based upon an
     act or omission (i) in breach of such person's duty of loyalty to us or our
     shareholders,  (ii) not in good faith or  involving a knowing  violation of
     law or (iii)  resulting  in  receipt  by a  director  or an  officer  of an
     improper personal benefit. No amendment to or repeal of this Article and no
     amendment,  repeal or termination of  effectiveness  of any law authorizing
     this Article shall apply to or effect  adversely any right or protection of
     any of our  directors  or  officers  for or  with  respect  to any  acts or
     omissions of the directors or officers occurring prior to amendment, repeal
     or termination of effectiveness.

o    To the extent that any of our directors, officers or other corporate agents
     have been  successful on the merits or otherwise in defense of any civil or
     criminal  action,  suit, or proceeding  referred to above, or in defense of
     any claim,  issue,  or matter therein,  any director,  officer or corporate
     agent will be indemnified against any expenses (including  attorneys' fees)
     actually  and  reasonably  incurred by the  director,  officer or corporate
     agent in connection therewith.

o    Expenses  incurred  by a director,  officer,  or other  corporate  agent in
     connection with a civil or criminal action, suit, or proceeding may be paid
     by the Company in advance of the final  disposition  of the action suit, or
     proceeding  as  authorized  by our board of  directors  upon  receipt of an
     undertaking  by or on behalf of the corporate  agent to repay the amount if
     it shall  ultimately be determined that the director,  officer or corporate
     agent is not entitled to be  indemnified.  The officers and directors  have
     indemnification  agreements  and are  covered  by  Directors  and  Officers
     Liability Insurance in the amount of 1 million dollars.

     Insofar as indemnification  for liabilities  arising under the Securities
     Act of 1933 may be permitted to our directors,  officers and  controlling
     persons pursuant to these provisions,  or otherwise,  we have been advised
     that, in the  opinion of the SEC,  this type of  indemnification  is
     against  public policy as expressed in the Securities Act and is,
     therefore, unenforceable.

                                     Experts

Our audited financial statements incorporated by reference have been examined by
Margolies, Fink and Wichrowski, independent certified public accountants, for
the periods and extent in their respective report and are used in reliance upon
their authority as experts in accounting and auditing.

                                 Legal Opinions


For the purpose of this offering, Christopher S. Auguste, Esq., Parker Chapin
LLP, is our counsel in regard to this amendment to the registration statement.


                                       36


                              Financial Information

The following financial statements should be read in conjunction with the
financial statement information contained in and incorporated by reference from
our most recent report on Form 10-KSB, which is being furnished with this
prospectus.


                                       37



                                                                              



This prospectus is part of a registration statement
we filed with the SEC.  You should rely on the
information or representations provided in this
prospectus.  We have authorized no one to provide you                    37,085,067 SHARES
with different information.  The selling security
holders described in this prospectus are not making               IMAGING DIAGNOSTIC SYSTEMS, INC.
an offer in any jurisdiction where the offer is not
permitted.  You should not assume that the                                  Common Stock
information in this prospectus is accurate as of any
date other than the date of this prospectus.

                   _________________

                   TABLE OF CONTENTS

                   _________________
                                                                           ________________
Page

Forward-Looking Statements........................3                           PROSPECTUS
Prospectus Summary................................3                        ________________
Recent Developments...............................4
The Offering......................................5
Risk Factors......................................6
Where You Can Find More Information..............18
Incorporation of Certain Documents by Reference..18
Information With Respect to the Registrant.......19
Management's Discussion and Analysis
 of Financial Condition and Results of Operation 19
Material Changes.................................20
Summary of Compensation Table....................20
Option/SAR Grants in Last Fiscal Year............20
Security Ownership of Certain Beneficial
 Owners and Management...........................21
Certain Relationships and Related Transactions...22               IMAGING DIAGNOSTIC SYSTEMS, INC.
Sale of Unregistered Securities..................23                      6531 NW 18TH COURT
Price Range of Common Stock......................31                  PLANTATION, FLORIDA 33313
Dividend Policy..................................31                        (954) 581-9800
Selling Security Holders.........................32
Use of Proceeds..................................34
Plan of Distribution.............................34
Description of Securities........................35
Disclosure of Commission Position on
 Indemnification for Securities and Liabilities..36
Experts  ........................................36
Legal Opinion....................................36
Financial Information............................37
                                                                        __________ ___, 2000




                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

The following table shows the estimated expenses in connection with the issuance
and distribution of the securities being registered:


         SEC registration fees ............................$ 4,284.00
         Legal fees and expenses...........................$15,000.00
         Accounting fees and expenses......................$ 3,000.00
         Miscellaneous.....................................$   100.00
         Edgar formatting fees.............................$ 8,490.00
                                                          -----------
         TOTAL                                             $30,874.00
                                                           ==========


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

The Florida General Corporation Act permits a Florida corporation to indemnify a
present or former director or officer of the corporation (and certain other
persons serving at the request of the corporation in related capacities) for
liabilities, including legal expenses, arising by reason of service in such
capacity if such person shall have acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation, and in any criminal proceeding if such person had no reasonable
cause to believe his conduct was unlawful. However, in the case of actions
brought by or in the right of the corporation, no indemnification may be made
with respect to any matter as to which such director or officer shall have been
adjudged liable, except in certain limited circumstances.

Article VII of our Articles of Incorporation authorizes us to indemnify
directors and officers as follows:

         1. So long as permitted by law, no director of the corporation shall be
         personally liable to the corporation or its shareholders for damages
         for breach of any duty owed by such person to the corporation or its
         shareholders; provided, however, that, to the extent required by
         applicable law, this Article shall not relieve any person from
         liability for any breach of duty based upon an act or omission (i) in
         breach of such person's duty of loyalty to the corporation or its
         shareholders, (ii) not in good faith or involving a knowing violation
         of law or (iii) resulting in receipt by such person of an improper
         personal benefit. No amendment to or repeal of this Article and no
         amendment, repeal or termination of effectiveness of any law
         authorizing this Article shall apply to or effect adversely any right
         or protection of any director for or with respect to any acts or
         omissions of such director occurring prior to such amendment, repeal or
         termination of effectiveness.

         2. So long as permitted by law, no officer of the corporation shall be
         personally liable to the corporation or its shareholders for damages
         for breach of any duty owed by such person to the corporation or its
         shareholders; provided, however, that, to the extent required by
         applicable law, this Article shall not relieve any person from
         liability for any breach of duty based upon an act or omission (i) in
         breach of such person's duty of loyalty to the corporation or its
         shareholders, (ii) not in good faith or involving a knowing violation
         of law or (iii) resulting in receipt by such person of an improper
         personal benefit. No amendment to or repeal of this Article and no
         amendment, repeal or termination of effectiveness of any law
         authorizing this Article shall apply to or effect adversely any right
         or protection of any director for or with respect to any acts or
         omissions of such officer occurring prior to such amendment, repeal or
         termination of effectiveness.

         3. To the extent that a Director, Officer, or other corporate agent of
         this corporation has been successful on the merits or otherwise in
         defense of any civil or criminal action, suit, or proceeding referred
         to in sections (a) and (b), above, or in defense of any claim, issue,
         or matter therein, he shall be indemnified against any expenses
         (including attorneys' fees) actually and reasonably incurred by him in
         connection therewith.

         4. Expenses incurred by a Director, Officer, or other corporate agent
         in connection with a civil or criminal action, suit, or proceeding may
         be paid by the corporation in advance of the final disposition of such

                                      II-1


         action suit, or proceeding as authorized by the Board of Directors upon
         receipt of an undertaking by or on behalf of the corporate agent to
         repay such amount if it shall ultimately be determined that he is not
         entitled to be indemnified.

INDEMNIFICATION FOR LIABILITIES UNDER THE SECURITIES ACT OF 1933 MAY BE
PERMITTED TO DIRECTORS, OFFICERS OR PERSONS CONTROLLING US ACCORDING TO THE
PROVISIONS IN OUR ARTICLES OF INCORPORATION, WE HAVE BEEN INFORMED THAT IN THE
OPINION OF THE SEC, THIS INDEMNIFICATION IS AGAINST PUBLIC POLICY AS EXPRESSED
IN THE ACT AND IS THEREFORE UNENFORCEABLE

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

(a)  Exhibits

EXHIBIT                            DESCRIPTION

3.1   Articles of Incorporation  (Florida)- Incorporated by reference to Exhibit
      3(a) of IDSI's Form 10-KSB for the fiscal year ending June 30, 1995
3.2   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  A
      Convertible  Preferred  Shares) - Incorporated  by reference to Exhibit 3.
      (i). 6 of IDSI's Form  10-KSB for the fiscal  year  ending June 30,  1996.
      File number 033-04008.
3.3   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  B
      Convertible  Preferred  Shares).   Incorporated  by  reference  to  IDSI's
      Registration Statement on Form S-1 dated July 1, 1997.
3.4   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  C
      Convertible  Preferred  Shares).  Incorporated by reference to IDSI's Form
      8-K dated October 15, 1997.
3.5   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  D
      Convertible  Preferred  Shares).  Incorporated by reference to IDSI's Form
      8-K dated January 12, 1998.
3.6   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  E
      Convertible  Preferred  Shares).  Incorporated by reference to IDSI's Form
      8-K dated February 19,1998.
3.7   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  F
      Convertible  Preferred  Shares).  Incorporated by reference to IDSI's Form
      8-K dated March 6, 1998.
3.8   Amendment  to  Articles  of   Incorporation   (Designation   of  Series  H
      Convertible  Preferred  Shares).   Incorporated  by  reference  to  IDSI's
      Registration Statement on Form S-2 File Number 333-59539.
3.9   Certificate  of  Dissolution  - is  incorporated  by  reference to Exhibit
      (3)(a) of IDSI's Form 10-KSB for the fiscal year ending June 30, 1995.
3.10  Articles of Incorporation  and By- Laws (New Jersey) -are  incorporated by
      reference to Exhibit 3 (i) of IDSI's Form 10-SB,  as amended,  file number
      0-26028, filed on May 6, 1995 ("Form 10-SB").
3.11  Certificate  and Plan of Merger - is  incorporated by reference to Exhibit
      3(i) of the Form 10-SB.
3.12  Certificate of Amendment - is incorporated by reference to Exhibit 3(i) of
      the Form 10-SB.
3.13  Amended Certificate of Amendment-Series G Designation.
3.14  Certificate of Amendment-Series I Designation
3.15  Amended Certificate of Amendment-Series B Designation
4.1   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series B Convertible Preferred Shares. (See Exhibit 3.3, above).
4.2   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series C Convertible Preferred Shares. (See Exhibit 3.4, above).
4.3   Instruments Defining the Rights of Security Holders -Designation of Series
      D Convertible Preferred Shares. (See Exhibit 3.5, above).
4.4   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series E Convertible Preferred Shares. (See Exhibit 3.6, above).
4.5   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series F Convertible Preferred Shares. (See Exhibit 3.7, above).

                                      II-2


EXHIBIT (cont.)                DESCRIPTION (cont.)

4.6   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series H Convertible Preferred Shares. (See Exhibit 3.8, above).
4.7   Instruments  Defining the Rights of Security Holders - Amended Designation
      of Series G Convertible Preferred Shares. (See Exhibit 3.13, above).
4.8   Instruments  Defining  the Rights of  Security  Holders -  Designation  of
      Series I Convertible Preferred Shares. (See Exhibit 3.14, above).
4.9   Instruments  Defining the Rights of Security Holders - Amended Designation
      of Series B Convertible Preferred Shares. (See Exhibit 3.15, above).
4.10  Convertible Debenture
5     Legal  opinion of  Rebecca  J. Del  Medico,  Esq.,  dated  July 26,  1999.
      Incorporated  by reference to ISDI's  Registration  Statement on Form S-2,
      File Number 333-59539.
10.1  Form of Subscription  Agreement by and between Imaging Diagnostic Systems,
      Inc.   and  Alfred   Ricciardi.   Incorporated   by  reference  to  IDSI's
      Registration Statement on Form S-2, File Number 333-59539.
10.2  Patent  Licensing  Agreement.  Incorporated  by  reference  to the  IDSI's
      Registration Statement on Form S-2, File Number 333-59539.
10.3  Incentive  Stock  Option Plan - is  incorporated  by  reference to Exhibit
      10(b) of the Form 10-SB.
10.4  Employment Agreement(s) for Richard J. Grable, Allan L. Schwartz and Linda
      B.  Grable are  incorporated  by  reference  to Exhibit  10(c) of the Form
      10-SB.
10.5  Lock Up  Agreement  By and Between  IDSI and Richard J.  Grable,  Linda B.
      Grable,  and Allan L. Schwartz,  is  incorporated  by reference to Exhibit
      10.5 of IDSI's Form 10-KSB for the fiscal year ending June 30, 1996.  File
      number 033-04008.
10.6  Form of Series F Preferred Stock Subscription  Documents.  Incorporated by
      reference  to  IDSI's  Registration  Statement  on Form S-2,  File  Number
      333-60405.
10.7  Form of Series H Preferred Stock Subscription  Documents.  Incorporated by
      reference  to  IDSI's  Registration  Statement  on Form S-2,  File  Number
      333-60405.
10.8  OEM  Agreement  incorporated  by  reference to Exhibit 10.8 of IDSI's Form
      10-KSB for the fiscal year ending June 30, 1998.
10.9  Form of Equity  Line of Credit  Agreement  incorporated  by  reference  to
      Exhibit  10.9 of IDSI's  Form  10-KSB for the fiscal  year ending June 30,
      1998.
10.10 Focus Distribution Agreement (United Kingdom and Ireland). Incorporated by
      reference to IDSI's Form 10-QSB/A filed on April 2, 1999.
10.11 Focus  Distribution   Agreement  (Benelux   countries).   Incorporated  by
      reference to IDSI's  Amendment  number 1 to Registration on Form S-2, File
      Number 333-60405.
10.12 Syncor  Distribution  Agreement.   Incorporated  by  reference  to  IDSI's
      Amendment number 1 to Registration on Form S-2, File Number 333-60405.
10.14 Consultronix  S.A.  Distribution  Agreement.  Incorporated by reference to
      IDSI's Form 10-KSB/A filed on April 9, 1999.
10.15 Iberadac, S.A. Distribution Agreement. Incorporated by reference to IDSI's
      Form 10-KSB/A filed on April 9, 1999.
10.16 Form of Series I Preferred Stock Subscription  Documents.  Incorporated by
      reference to IDSI's  Amendment  number 1 to Registration on Form S-2, File
      Number 333-60405.
10.17 Form of Debenture  Subscription  Documents.  Incorporated  by reference to
      IDSI's  Amendment  number  1 to  Registration  on Form  S-2,  File  Number
      333-60405.
10.18 Form of Mortgage.  Incorporated by reference to IDSI's  Amendment number 1
      to Registration on Form S-2, File Number 333-60405.
10.19 Form of Series G  Subscription  Documents.  Incorporated  by  reference to
      IDSI's  Amendment  number  1 to  Registration  on Form  S-2,  File  Number
      333-60405.
10.20 Form of Registration Rights Agreement. Incorporated by reference to IDSI's
      Amendment number 1 to Registration on Form S-2, File Number 333-60405.
10.21 Form of Debenture in the amount of $825,000.  Incorporated by reference to
      our Form  10-KSB for the fiscal year ending June 30, 1999 filed on October
      12, 1999.
10.22 Registration Rights Agreement $825,000 Convertible Debenture. Incorporated
      by  reference  to our Form 10-KSB for the fiscal year ending June 30, 1999
      filed on October 12, 1999.

                                      II-3


EXHIBIT (cont.)                DESCRIPTION (cont.)


10.23 Subscription  Agreement $825,000 Convertible  Debenture.  Incorporated by
      reference  to our Form  10-KSB for the fiscal  year  ending  June 30, 1999
      filed on October 12, 1999.
10.24 1999 Equity  Incentive Plan.  Incorporated by reference to our Form 10-KSB
      for the fiscal year ending June 30, 1999 filed on October 12, 1999.
10.25 Distribution Agreement by and between IDSI and Cycle of Life Technologies,
      Inc., dated November 29, 1999.
10.26 Promissory Note by and between IDSI and Cycle of Life Technologies, Inc.,
      dated February 1, 2000.
10.27 Consulting Agreement with Anthony Giambrone signed January 26, 2000.
10.28 Employment  Agreements(s)  for Richard J.  Grable,  Allan L.  Schwartz
      and Linda B. Grable signed August 30, 1999.
24.2  Consent of Independent Certified Public Accountants.



(b) Reports on Form 8-K

         None

ITEM 17.  UNDERTAKINGS.

         The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement:

               (i)  To include any prospectus required by Section 10(a)(3) of
                    the Securities Act;

               (ii) To reflect in the prospectus any facts or events arising
                    after the effective date of the registration statement (or
                    the most recent post-effective amendment thereof) which,
                    individually or in the aggregate, represent a fundamental
                    change in the information set forth in the registration
                    statement. Notwithstanding the foregoing, any increase or
                    decrease in the volume of securities offered (if the total
                    dollar value of securities offered would not exceed that
                    which was registered) and any deviation from the low or high
                    and of the estimated maximum offering range may be reflected
                    in the form of prospectus filed with the Commission pursuant
                    to Rule 424 (b) if, in the aggregate the changes in volume
                    and price represent no more than 20 percent change in the
                    maximum aggregate offering price set forth in the
                    "Calculation of Registration Fee" table in the effective
                    registration statement.

               (iii) To include any material information with respect to the
                    plan of distribution not previously disclosed in the
                    registration statement or any material change to such
                    information in the registration statement.

         (2) That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof; and

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Act") may be permitted to directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
the registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer, or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer of controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

                                      II-4


         The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bonafide offering thereof.

                                      II-5



                                   SIGNATURES

According to the requirements of the Securities Act of 1933, as amended, the
Registrant certifies that it has reasonable grounds to believe that it meets the
requirement for filing on Form S-2 and has duly caused this Amended Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Plantation, State of Florida, on the 29th day of
February 2000.

                                 IMAGING DIAGNOSTIC SYSTEMS, INC.


                                 By: /s/ Linda B. Grable
                                     Linda B. Grable, Chairman of the Board,
                                     Director, and President

According to the requirements of the Securities Act of 1933, as amended, this
Amended Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.


Dated: February 29, 2000         By:  /s/ Linda B. Grable
                                      -------------------
                                      Linda B. Grable, Chairman of the Board
                                      Director and President

Dated: February 29, 2000         By:  /s/ Richard J. Grable
                                      ---------------------
                                      Richard J. Grable, Director
                                      and Chief Executive Officer

Dated: February 29, 2000         By:  /s/ Allan L. Schwartz
                                      ---------------------
                                      Allan L. Schwartz, Director
                                      and Executive Vice-President
                                      Chief Financial Officer
                                      (PRINCIPAL ACCOUNTING OFFICER)






                                  EXHIBIT 24.2

               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

We hereby consent to the use in this Post-Effective Amendment No. 4 to the
Registration Statement on Form S-2, of Imaging Diagnostic Systems, Inc. of our
report dated August 31, 1999, which appears on Page F-1 of Form 10-KSB for the
year ended June 30, 1999, and to the reference to our firm under the caption
"Experts" in the prospectus.

                               __/s/ Margolies, Fink  and Wichrowski
                               ---------------------------------------
                                 MARGOLIES, FINK and WICHROWSKI
Pompano Beach, Florida
February 29, 2000