Exhibit 4.5

                               DIAGNON CORPORATION


                             1998 STOCK OPTION PLAN

1.       GENERAL

         1.1 This 1998 Stock Option Plan ("Plan") is intended to encourage the
         ownership of Common Stock of the Diagnon Corporation (the
         "Corporation") by eligible key employees of the Corporation and to
         provide incentives for them to exert maximum efforts for the welfare of
         the Corporation. By extending to key employees the opportunity to
         acquire equity interests in the Corporation and to participate in its
         success, this Plan is expected to benefit the Corporation and its
         stockholders by making it possible for the Corporation to attract and
         retain the best available talent and by rewarding key management and
         technical personnel for their part in increasing the value of the
         Corporation's shares. The Corporation also recognizes that it relies
         heavily upon the contributions of independent consultants retained on a
         regular basis and on the efforts of members of the Board of Directors
         who are not employees. The Corporation also wishes to extend to these
         consultants and directors the opportunity to acquire equity interests
         in the Corporation and participate in its success. This Plan also is
         intended to replace the Corporation's 1988 Stock Option Plan, as
         amended (the "1988 Plan").

         1.2 This plan shall have two (2) components: one component provides for
         Incentive Stock Options ("Incentive Options") as defined in Section 422
         of the Internal Revenue Code ("the Code"); and the other component
         provides for Non-Qualified Stock Options ("Non-Qualified Options"),
         which are not intended to be options as defined in Section 422 of the
         Code. The Incentive Options and the Non-Qualified Options are sometimes
         referred to together as the "Options." A participant who has been
         granted an Incentive or a Non-Qualified Option may be granted an
         additional Option or Options under this Plan.

         1.3 This Plan was adopted by the Board of Directors of the Corporation
         (the "Board") on July 17, 1997, subject to the approval of the
         Corporation's shareholders.


2.       STOCK SUBJECT TO THIS PLAN

                  The Corporation may issue a maximum of eighty-three thousand,
         three hundred, and thirty-three (83,333) shares of the Corporation's
         Common Stock, par value one cent (0.01), to satisfy Options granted
         under this Plan. The Corporation shall at all times reserve a
         sufficient number of shares, which may be unissued or reacquired, to
         honor all Options then exercisable. If any Option previously granted
         shall expire or terminate for any reason without having been fully
         exercised, the unpurchased shares shall again become available for the
         purposes of the Plan.




3.       INCENTIVE OPTIONS

         3.1 All provisions of this Plan relating to Incentive Options shall be
         administered by a committee (the "Incentive Committee"), consisting of
         not fewer than two (2) Directors of the Corporation who shall be
         disinterested within the meaning of Rule 16b-3 of the General Rules and
         Regulations under the Securities Exchange Act of 1934, and who shall
         serve at the pleasure of the Board. The determinations of the Incentive
         Committee shall be made in accordance with their judgment as to the
         best interests of the Corporation and its stockholders and in
         accordance with the purposes of this Plan. No member of the Incentive
         Committee shall be liable for any action taken or determination made in
         good faith with respect to this Plan or any Incentive Option granted
         hereunder. Subject to the provisions of this Plan and the requirements
         of the Code with respect to Incentive Options, the Incentive Committee
         shall have full authority to interpret this Plan with respect to
         Incentive Options, to establish and amend rules and regulations
         relating to Incentive Options, to determine the terms and provisions of
         Incentive Option agreements (which need not be identical), and to make
         all other determinations necessary or advisable for the administration
         of Incentive Options granted under this Plan, including but not limited
         to determining: (i) which eligible employees, officers, and directors,
         of the Corporation shall be granted Incentive Options under this Plan;
         (ii) the time or times, during the term of each Incentive Option,
         within which all or portions of the Incentive Option may be exercised;
         (iii) whether, on the date of exercise of an Incentive Option or
         portion thereof, the recipient must pay the entire Incentive Option
         price or only some part thereof, the balance to be paid within one year
         from the date of exercise of the Incentive Option, provided that
         payment tendered on the date of exercise equals or exceeds the
         aggregate par value of the shares purchased; (iv) the number of shares
         for which an Incentive Option or Incentive Options shall be granted;
         and (v) generally all questions of policy and expediency that may
         arise, including the correction of any defect or omission in this Plan
         and the reconciliation of any inconsistency in this Plan or any
         Incentive Option agreement in any manner and to the extent the
         Incentive Committee shall deem necessary or expedient to make this Plan
         fully effective. The Incentive Committee's interpretation, construction
         and adoption of any provisions of this Plan relating to Incentive
         Options or any Incentive Option granted hereunder shall be binding and
         conclusive, unless otherwise determined by the Board. Any power that
         may be exercised or action that may be taken by the Incentive Committee
         under this Plan may also be exercised or taken by the Board. The Board
         may, at any time by resolution, revoke the delegation of the Incentive
         Committee and revest in the Board all or any part of the powers
         hereinabove vested in the Incentive Committee.

         3.2 Whenever the term "officers" is used in this Plan, such term shall
         be deemed to include assistant officers of the Corporation and officers
         of subsidiaries of the Corporation. The term "subsidiary" shall mean
         any domestic or foreign corporation of which the Corporation owns,
         directly or indirectly, at least fifty (50%) percent of the total
         combined voting power of all classes of stock of such corporation. In
         determining the employees to whom Incentive Options shall be granted
         and the number of shares to be subject to purchase under such Incentive
         Options, the Incentive Committee shall take into account the duties of
         the respective employees, their present and potential contributions to
         the success of the Corporation, and such other factors as the Incentive
         Committee shall deem relevant in connection with accomplishing the
         purposes of the Incentive Plan. Membership on the Board of Directors



         shall not disqualify a person from receiving an Incentive Option grant
         hereunder, although Directors who are members of the Incentive
         Committee or who are not officers or managerial employees of the
         Corporation or a subsidiary are not eligible to receive Incentive
         Options under this Plan.

         3.3 The exercise price of any Incentive Option granted to an employee
         who at the time such Incentive Option is granted, owns, as defined in
         Section 424 of the Code, stock possessing not more than ten (10%)
         percent of the total combined voting power of all classes of stock of:

                  3.3.1    the Corporation; or

                  3.3.2 if applicable, any subsidiary of the Corporation
                  qualifying as a "Subsidiary Corporation" as defined in Section
                  424 of the Code (any such corporation being hereinafter
                  referred to as a "Subsidiary"); or

                  3.3.3 If applicable, any parent of the Corporation qualifying
                  as a "Parent Corporation" as defined in Section 424 of the
                  Code (any such corporation being hereinafter referred to as
                  the "Parent"),

         shall be at least equal to the fair market value of the Common Stock at
         the time of granting of the Incentive Option.

         3.4 The exercise price of any Incentive Option granted to an employee
         who, at the time such Incentive Option is granted, owns, as defined in
         Section 424 of the Code, stock possessing more than (10%) percent of
         the total combined voting power of all classes of stock of:

                  3.4.1    the Corporation; or

                  3.4.2    if applicable, a Subsidiary; or

                  3.4.3    if applicable, the Parent,

         shall be at least equal to one hundred ten (110%) percent of the fair
         market value of the Common Stock at the time of granting of the
         Incentive Option.

         3.5 For all purposes of this Plan, the fair market value of the Common
         Stock at the time of granting an Option shall be deemed to be the mean
         between the high and the low prices of the Common Stock on the national
         securities exchange on the day on which the Option is granted, if the
         Common Stock is then being traded on a national securities exchange,
         and if the Common Stock is then being traded on such an exchange but
         there are no sales on such day, the fair market value shall be deemed
         to be the mean between the high and low prices of the Common Stock on
         the national securities exchange on the day on which the most recent
         sales occurred prior to the date of grant, and if the Common Stock is
         not then traded on such an exchange, then the fair market value shall
         be deemed to be the mean between the high and low bid and asked prices
         for the Common Stock on the over-the-counter market on the day on which
         the option is granted. If the Common Stock is not publicly traded at
         the time of the grant, the fair market value shall be determined in
         good faith at the time of the grant of any Incentive Option by decision
         of the Incentive Committee.

         3.6 The date of grant of an Incentive Option granted hereunder shall be
         the date on which the Incentive Committee acts in granting the
         Incentive Option.




         3.7 Incentive Options granted hereunder shall be exercisable for a term
         of not more than ten (10) years from the date of grant thereof, but
         shall be subject to Section 3.8 and to earlier termination as
         hereinafter provided. Each Incentive Option agreement issued hereunder
         shall specify the term of the Incentive Option, which term shall be
         determined by the Incentive Committee in accordance with its
         discretionary authority hereunder.

         3.8 Notwithstanding anything herein to the contrary, in the event an
         Incentive Option is granted to an employee who, at the time such option
         is granted, owns, as defined in Section 424 of the Code, stock
         possessing more than ten (10%) percent of the total combined voting
         power of all classes of stock of:

                  3.8.1    the Corporation; or

                  3.8.2    if applicable, a Subsidiary; or

                  3.8.3    if applicable, the Parent,

         then such Incentive Option shall not be exercisable more than five (5)
         years from the date of grant thereof, but shall be subject to earlier
         termination as hereinafter provided.

         3.9 No Option will be treated as an Incentive Option to the extent that
         the aggregate fair market value (determined at the time the Option is
         granted) of the stock with respect to which the Option is exercisable
         for the first time by any individual during any calendar year (under
         all plans of the Corporation and any subsidiary) exceeds one hundred
         thousand ($100,000) dollars.

         3.10 No person may receive Incentive Options prior to the date on which
         employment of such person by the Corporation actually commences.

4.       NON-QUALIFIED OPTIONS

         4.1 All provisions of this Plan relating to Non-Qualified Options shall
         be administered by the Compensation Committee (the "Compensation
         Committee") appointed by the Board. The Compensation Committee shall
         consist of not less than two (2) members of the Board. The
         determinations of the Compensation Committee shall be made in
         accordance with their judgment as to the best interests of the
         Corporation and its stockholders and in accordance with the purposes of
         this Plan. No member of the Compensation Committee shall be liable for
         any action taken or determination made in good faith with respect to
         this Plan or any Non-Qualified Option granted hereunder. Subject to the
         provisions of this Plan and the requirements of the Code, the
         Compensation Committee shall have full authority to interpret this Plan
         with respect to Non-Qualified Options, to establish and amend rules and
         regulations relating to Non-Qualified Options, to determine the terms
         and provisions of Non-Qualified Option agreements (which need not be
         identical), and make all other determinations necessary or advisable
         for the administration of Non-Qualified Options granted under this
         Plan, including but not limited to determining: (i) which eligible
         employees, officers, directors, and consultants of the Corporation
         shall be granted Non-Qualified Options under this Plan; (ii) the time
         or times, during the term of each Non-Qualified Option, within which
         all or portions of the Non-Qualified Option may be exercised; (iii)
         whether, on the date of exercise of a Non-Qualified Option or portion
         thereof, the recipient must pay the entire Non-Qualified Option price
         or only some part


         thereof, the balance to be paid within one year from the date of
         exercise of the Non-Qualified Option, provided that payment tendered on
         the date of exercise equals or exceeds the aggregate par value of the
         shares purchased; (iv) the number of shares for which a Non-Qualified
         Option or Non-Qualified Options shall be granted; and (v) generally all
         questions of policy and expediency that may arise, including the
         correction of any defect or omission in this Plan and the
         reconciliation of any inconsistency in this Plan or any Non-Qualified
         Option agreement in any manner and to the extent the Committee shall
         deem necessary or expedient to make this Plan fully effective. The
         Compensation Committee's interpretation, construction and adoption of
         any provisions of this Plan relating to Non-Qualified Options or any
         Non-Qualified Option granted hereunder shall be binding and conclusive,
         unless otherwise determined by the Board. Any power that may be
         exercised or action that may be taken by the Compensation Committee
         under this Plan may also be exercised or taken by the Board. The Board
         may, at any time by resolution, revoke the delegation of the
         Compensation Committee and revest in the Board all or any part of the
         powers hereinabove vested in the Compensation Committee.

         4.2 The Compensation Committee and the Incentive Committee may be
         combined into one (1) committee of the Board so long as the membership
         requirements set forth herein for both committees are met by the
         members of the combined committee.

         4.3 Eligible recipients of Non-Qualified Options under this Plan shall
         be Directors, officers, and selected employees and consultants of the
         Corporation and its Subsidiaries. Recipients will be selected by the
         Compensation Committee. The granting of a Non-Qualified Option under
         this Plan shall not affect any outstanding stock option previously
         granted to an optionee under this Plan or any other plan of the
         Corporation.

         4.4 On the date a Non-Qualified Option is granted, the exercise price
         per share shall be such price that the Committee deems appropriate.

5.       TERMS OF OPTION AND OPTION AGREEMENTS

         5.1 Each Incentive Option granted to a person eligible to receive such
         Incentive Option (a "Qualifying Optionee") shall be evidenced by a
         written agreement (an "Incentive Option Agreement") which shall
         expressly identify the Incentive Options as "Incentive Stock Options,"
         i.e., Options within the meaning of Section 422 of the Code. Each
         Non-Qualified Option granted to each other person eligible to receive
         Non-Qualified Options hereunder shall be evidenced by a written
         agreement (a "Non-Qualified Option Agreement") which shall expressly
         identify the Non-Qualified options as other than "Incentive Stock
         Options." Unless specifically identified herein as applicable to
         Incentive Options, the provisions of' this Plan shall apply to both
         Incentive Options and Non-Qualified Options. Each Incentive Option
         Agreement and each Non-Qualified Option Agreement shall: (a) be in such
         form and contain such provisions as the Board or the Committee shall
         from time to time deem appropriate, and (b) include in substance, by
         appropriate language, all of the applicable following provisions.

         5.2 The Option may be granted at any time within ten (10) years from
         the earlier of the date on which this Plan is approved by the
         stockholders or was adopted by the Corporation's Board of Directors.

         5.3 Incentive Options granted under this Plan to a Qualifying Optionee
         are not required to be exercised in the order in which they are
         granted.


         5.4 An Option may not be exercised, to any extent, either by the person
         to whom it was granted or by any person after his death, unless the
         person to whom the Option was granted has remained in the continuous
         employ of the Corporation, or has been a consultant to or director of
         the Corporation, for not less than six months from the date of the
         grant.

         5.5 A Qualifying Optionee may not dispose of shares acquired through
         exercise of an Incentive Option (i) within two (2) years from the date
         of the granting of the Incentive Option or (ii) within one (1) year
         after the transfer of the shares to him by the Corporation and qualify
         for the tax treatment provided by Section 421(a) of the Code.

         5.6 The Corporation will seek from every regulatory commission or
         agency having jurisdiction such authority as may be required to issue
         and sell shares of stock to satisfy the Options. The Corporation's
         inability to obtain from any such regulatory commission or agency
         authority which counsel for the Corporation deems necessary for the
         lawful issuance and sale of the Corporation's stock to satisfy the
         Options, shall relieve the Corporation from any liability for failure
         to issue and sell stock to satisfy otherwise properly exercised Options
         until such time as such authority is obtained or is obtainable.

         5.7 Neither a person to whom an Option is granted nor his legal
         representative, heir, legatee or distributee, shall be deemed to be a
         holder of, or to have any of the rights of a holder with respect to,
         any shares subject to such Option unless and until he has exercised his
         Option in complete accordance with the terms thereof.

         5.8 An Option shall not be transferable except by will or by the laws
         of descent and distribution. During the lifetime of the person to whom
         the Option is granted, he alone may exercise it.

         5.9 An Incentive Option granted to a Qualifying Optionee shall
         terminate if the person to whom it is granted ceases to be continuously
         employed by the Corporation, except (i) if such person's employment is
         terminated for a reason other than death, permanent or total disability
         (within the meaning of Section 22(e)(3) of the Code) or dismissal for
         cause, he may exercise his Incentive Option to the extent that he was
         entitled to do so at the date of his termination at any time within
         three (3) months following the date of such termination; (ii) if his
         continuous employment is terminated for reason of permanent or total
         disability (within the meaning of Section 22(e)(3) of the Code), he or
         his legal representative, in the event the employee is legally
         incapable of doing so, may exercise his Incentive Option to the extent
         that he was entitled to do so at the date of his termination at any
         time within one (1) year following the date of such termination; or
         (iii) if his continuous employment is terminated by death or the
         employee's death occurs within three(3) months of his termination of
         employment, such termination being for reason other than dismissal for
         cause, his Incentive Option may be exercised at any time within one (1)
         year following his death by the person or persons to whom his rights
         under the Incentive Option shall pass by will or by the laws of descent
         or distribution, but only to the extent that such Incentive Option was
         exercisable by him on the date of termination of his employment.
         Nothing in this paragraph is intended to extend the stated term of the
         Incentive Option and in no event may an Option be exercised by anyone
         after the expiration of its stated term.


         5.10 Nothing in this Plan or in any Option granted hereunder shall
         confer on any Optionee any right to continue in the employ of the
         Corporation or to interfere in any way with the right of the
         Corporation to terminate his employment at any time. In the event that
         the Corporation has not registered the shares with respect to which
         Options are being exercised under the Securities Act of 1933, as
         amended, each Optionee electing to purchase shares will be required to
         represent that he is acquiring such shares for investment purposes only
         and not with a view to the sale or distribution thereof and to make
         such other representations as are deemed necessary by counsel to the
         Corporation. Stock certificates evidencing such unregistered shares
         acquired upon exercise of Options shall bear a restrictive legend
         (unless, in the opinion of counsel for the Corporation, such a legend
         is not necessary) stating as follows:

                  The shares represented by this certificate have not been
                  registered under the Securities Act of 1933. The shares have
                  been acquired for investment and may not be pledged or
                  hypothecated and may not be sold or transferred in the absence
                  of an effective registration statement for the shares under
                  the Securities Act of 1933 or an opinion of counsel
                  satisfactory to the Corporation that registration is not
                  required under said Act.

         5.11 If the Corporation shall at any time change the number of shares
         of its Common Stock without new consideration to the Corporation (such
         as by stock dividends or stock splits), the aggregate number of shares
         which may be issued pursuant to Options granted under this Plan and the
         total number of shares then remaining subject to purchase under an
         outstanding Option shall be changed in proportion to such change in
         issued shares. The Option price per share also shall be adjusted so
         that the total consideration payable to the Corporation upon the
         purchase of all shares not theretofore purchased shall not be changed.

         5.12 If, during the term of any outstanding Option, the Corporation
         shall issue other securities of the Corporation or distribute other
         property (other than cash) as a distribution or dividend on or in
         exchange for Common Stock of the Corporation, the Corporation shall
         take such steps as the Incentive Committee, the Compensation Committee,
         and the Board deem appropriate: (a) equitably to adjust the kind and
         amount of securities then remaining subject to purchase thereunder and
         the exercise price per share; or (b) equitably to adjust the rights of
         the optionee thereunder in order to reflect such issuance or
         distribution of securities or other property.

         5.13 If, during the term of an outstanding Option, the Common Stock of
         the Corporation shall be changed into another kind of security of the
         Corporation or into cash, securities, or evidences of indebtedness of
         another corporation, other property or any combination thereof, as a
         result of a reorganization, sale, merger, consolidation, or other
         similar transaction, the optionee shall be entitled to receive, at the
         election of the optionee (a) upon the due exercise of the Option or (b)
         upon the effective date of the reorganization, sale, merger,
         consolidation or similar transaction, the cash, securities, evidences
         of indebtedness, other property or any combination thereof the optionee
         would have been entitled to receive for Common Stock acquired through
         exercise of the Option (net of the exercise price) immediately prior to
         the effective date of such reorganization, sale, merger, consolidation
         or other similar transaction. If appropriate, the exercise price of the
         shares or securities remaining subject to purchase following such
         reorganization, sale, merger, consolidation or other similar
         transaction



         may be adjusted in each case in such equitable manner as the relevant
         Committee and the Board may determine.

6.       LIMIT ON STOCK SUBJECT TO OPTIONS

         6.1 No Option may be granted under this Plan if the number of shares
         that may be issued upon the exercise of that Option, when added to the
         number of shares that may be issued (i) upon the exercise of unexpired
         options already granted under the 1988 Plan, and (ii) upon the exercise
         of unexpired Options already granted under this Plan, would exceed ten
         (10%) percent of the then issued and outstanding Common Stock of the
         Corporation.

         6.2 The aggregate fair market value (determined at the time Options are
         granted) of stock with respect to which Incentive Options are
         exercisable for the first time by a Qualifying Optionee during any
         calendar year shall not exceed one hundred thousand ($100,000) dollars.

7.       LISTING REQUIREMENTS

         The Corporation shall not be required to issue or deliver any
certificate for shares of its stock purchased upon the exercise of any Option
issued under this Plan prior to the admission of such shares to listing on any
stock exchange on which the stock may at that time be listed; provided, however,
that the Corporation shall take all necessary steps to secure the admission of
such stock to listing on any such stock exchange and shall secure admission of
such shares at the earliest practicable date.


8.       TIME OF GRANTING OPTION

         The date on which an Option shall be deemed granted shall be the date
on which a majority of the members of the Board or the Committee shall, at a
meeting, make such determination.


9.       AMENDMENT OF THE PLAN

         9.1 The Board or the Incentive Committee or the Compensation Committee,
         as the case may be, may, at any time, amend this Plan; provided,
         however, that no amendment shall be made, except upon approval by a
         majority of the shares of the Corporation entitled to vote and voting
         in person or by proxy at a meeting of the Corporation's stockholders,
         which will:

                  9.1.1 increase the number of shares reserved for Options under
                  this Plan; or

                  9.1.2 change in substance the provisions designating the
                  employees eligible to receive and exercise Incentive Options
                  under this Plan.

         9.2 The rights and obligations created under any Option granted before
         amendment of this Plan shall not be altered or impaired by such
         amendment without consent of the person to whom the Option was granted
         or to whom rights under an Option shall have passed by will or by laws
         of descent or distribution.

10.      TERMINATION OR SUSPENSION OF THE PLAN

         10.1 The Board may at any time suspend or terminate this Plan. This



         Plan, unless sooner terminated, shall terminate upon the earlier of ten
         (10) years (i) from the date on which this Plan is approved by the
         stockholders, or (ii) the date on which this Plan is adopted by the
         Corporation's Board of Directors.

         10.2 This Plan will also terminate if Incentive Options are exercised
         for all the Common Stock reserved for issuance under this Plan. An
         Option may not be granted while this Plan is suspended or after it is
         terminated.

         10.3 The rights and obligations created under any Option granted while
         this Plan is in effect shall not be altered or impaired by suspension
         or termination of this Plan, except with the consent of the person to
         whom the Option was granted. The termination of this Plan shall not
         affect any restrictions previously imposed on shares issued pursuant to
         this Plan.

11.      EFFECTIVE DATE

         This Plan shall be deemed adopted upon the earlier of (i) approval by
vote of the holders of the majority of the shares of the Corporation entitled to
vote and voting in person or by proxy on the matter, or (ii) the date on which
this Plan is adopted by the Corporation's Board of Directors. This Plan shall
not be effective (and no Options can be granted), however, until it is approved
by vote of the holders of the majority of shares of the Corporation entitled to
vote and voting in person or by proxy on the matter.