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                                                                    Exhibit 3.46

                                     BYLAWS

                                       OF

                    METRO RADIOLOGY MANAGEMENT SERVICES, INC.

                                    ARTICLE I

OFFICES:

Section 1.            Principal Office:
                      The principal office of the Corporation shall be located
                      at 1901 Hillandale Road, Durham, North Carolina.

Section 2.            Registered Office:

                      The registered office of the Corporation required by law
                      to be maintained in the State of North Carolina may be,
                      but need not be identical with the principal office.

Section               3. Other Offices: The Corporation may have offices at such
                      other places, either within or without the State of North
                      Carolina, as the Board of Directors may from time to time
                      determine, or as the affairs of the Corporation may
                      require from time to time.

                                   ARTICLE II

SHAREHOLDERS MEETINGS:

Section 1.            Place of Meetings:

                      All meetings of shareholders shall be held at the
                      principal office of the Corporation, or at such other
                      place, either within or without the State of North
                      Carolina, as shall be designated in the notice of the
                      meeting or agreed upon by a majority of the shareholders
                      entitled to vote thereat.

Section 2.            Annual Meetings:

                      The annual meeting of the shareholders of the Corporation,
                      for the purposes of electing directors and transacting
                      such other business as may be properly brought before the
                      meeting, shall be held on any day (except a Saturday,
                      Sunday or legal holiday) as determined by the Board of
                      Directors.

Section 3.            Substitute Annual Meetings:

                      If the annual meeting shall not be held on the day
                      designated by these bylaws, a substitute annual meeting
                      may be called in accordance with the provisions of Section
                      4 of this Article. A meeting so called shall be designated
                      and treated for all purposes as the annual meeting.
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Section 4.            Special Meetings:

                      Special meetings of the shareholders may be called at any
                      time by the President, Secretary, or Board of Directors of
                      the Corporation, or by any shareholder, pursuant to the
                      written request of the holders of not less than one-tenth
                      of all shares entitled to vote at the meeting.

Section 5.            Notice of Meetings:

                      Written or printed notice stating the time and place of
                      the meeting shall be delivered not less than ten days nor
                      more than fifty days before the date thereof, either
                      personally or by mail, by or at the direction of the
                      President, the Secretary, or other person calling the
                      meeting, to each shareholder of record entitled to vote at
                      such meeting; provided that such notice must be given not
                      less than twenty days before the date of any meeting at
                      which a merger or consolidation is to be considered. If
                      mailed, such notice shall be deemed to be delivered when
                      deposited in the United States mail, addressed to the
                      shareholder at his address as it appears on the record of
                      the shareholders of the Corporation, with postage thereon
                      paid.

                      In the case of an annual or substitute annual meeting, the
                      notice of the meeting need not specifically state the
                      business to be transacted thereat, unless it is a matter
                      other than elections of directors, on which the vote of
                      shareholders is expressly required by the provisions of
                      the laws of the State of North Carolina. In the case of a
                      special meeting, the notice of the meeting shall
                      specifically state the purpose or purposes for which the
                      meeting is called.

                      When a meeting is adjourned for thirty days or more,
                      notice of the adjourned meeting shall be given as in the
                      case of an original meeting. When a meeting is adjourned
                      for less than thirty days in any one adjournment, it is
                      not necessary to give any notice of the adjourned meeting,
                      other than by announcement at the meeting at which the
                      adjournment is taken.

Section 6.            Voting Lists:

                      At least ten days before each meeting of shareholders, the
                      secretary of the Corporation shall prepare an alphabetical
                      list of the shareholders entitled to vote at such meetings
                      with the address of and the number of shares held by each,
                      which list shall be kept on file at the registered office
                      of the Corporation for a period of ten days prior to such
                      meeting and shall be subject to the inspection by any
                      shareholders during the whole time of the meeting.

Section 7.            Quorum:

                      The holders of a majority of the outstanding shares
                      entitled to vote, represented in person or by proxy, shall
                      constitute a quorum at meetings of shareholders. If there
                      is no quorum at a meeting of shareholders, such meeting
                      may be adjourned from time to time by the vote of a
                      majority of the shares voting on the motion to adjourn;
                      and at any adjourned meeting at which a



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                      quorum is present, any business may be transacted which
                      might have been transacted at the original meeting.

                      The shareholders at a meeting at which a quorum is present
                      may continue to do business until adjournment,
                      notwithstanding the withdrawal of enough shareholders to
                      leave less than a quorum.

Section 8.            Voting of Shares:

                      Subject to the provisions of Section 4 of Article III,
                      each outstanding share having voting rights shall be
                      entitled to one vote on each matter submitted to a vote at
                      a meeting of shareholders.

                      Except in the election of directors as governed by the
                      provisions of Section 3 of Article III, the vote of a
                      majority of the shares voted on any matter at a meeting of
                      shareholders at which a quorum is present shall be the act
                      of the shareholders on that matter unless the vote of a
                      greater number is required by law or by the charter or
                      bylaws of this Corporation.

                      Shares of its own stock owned by the Corporation, directly
                      or indirectly, through a subsidiary corporation or
                      otherwise, shall not be voted and shall not be counted in
                      determining the total number of shares entitled to vote,
                      except that shares held in a fiduciary capacity may be
                      voted and shall be counted to the extent provided by law.

                      Voting on all matters, except the election of directors,
                      shall be by voice vote or by a show of hands, unless the
                      holders of one-tenth of the shares represented at the
                      meeting shall, prior to the voting on any matter, demand a
                      ballot vote on that particular matter.

Section 9.            Informal Action by Shareholders:

                      Any action which may be taken at a meeting of the
                      shareholders may be taken without a meeting if a consent,
                      in writing, setting forth the action so taken, shall be
                      signed by all of the persons who would be entitled to vote
                      upon such action at a meeting and filed with the Secretary
                      of the Corporation to be kept in the corporate minute
                      book.

Section 10.           Proxies:

                      Shares may be voted either in person or by one or more
                      agents authorized by a written proxy executed by the
                      shareholder or his duly authorized attorney-in-fact. A
                      proxy is not valid after the expiration of eleven months
                      from the date of its execution unless the person executing
                      it specified therein the length of time for which it is to
                      continue in force or limits its use to a particular
                      meeting, but no proxy shall be valid after ten years from
                      the date of its execution.

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                                   ARTICLE III

DIRECTORS:

Section 1.            General Powers:

                      The business and affairs of the Corporation shall be
                      managed by the Board of Directors or by such Executive
                      Committee as the Board of Directors may establish pursuant
                      to these bylaws.

Section 2.            Number, Term, And Qualifications:

                      The Corporation shall have directors, and from time to
                      time the number of directors shall be the number fixed or
                      changed by action of the shareholders, but no reduction in
                      the number of directors shall of itself have the effect of
                      shortening the term of any incumbent director. Each
                      director shall hold office until his death, resignation,
                      retirement, removal, disqualification or until his
                      successor is elected and qualified. Directors need not be
                      residents of the State of North Carolina or shareholders
                      of the Corporation.

Section 3.            Election of Directors:

                      Except as provided in Section 6 of this Article, the
                      directors shall be elected at the annual meeting of
                      shareholders; those persons who receive the highest number
                      of votes shall be deemed to have been elected. If any
                      shareholder so demands, the election of directors shall be
                      by ballot.

Section 4.            Cumulative Voting:

                      Every shareholder entitled to vote at an election of
                      directors shall have the right to vote the number of
                      shares standing of record in his name for as many persons
                      as there are directors to be elected and for whose
                      election he has a right to vote or to cumulate his votes
                      by giving one candidate as many votes as the number of
                      such directors multiplied by the number of his shares
                      shall equal or by distributing such votes on the same
                      principal among any number of such candidates. This right
                      of cumulative voting shall not be exercised unless some
                      shareholder or proxy holder announces in open meeting,
                      before the voting for the directors starts, his intention
                      so to vote cumulatively and if such announcement is made,
                      the chair shall declare that all shares entitled to vote
                      have the right to vote cumulatively and shall thereupon
                      grant a recess of not less than one nor more than four
                      hours, as he shall determine, or of such other period of
                      time as is unanimously then agreed upon.

Section 5.            Removal:

                      Any director may be removed from office at any time, with
                      or without cause, by a vote of Shareholders holding a
                      majority of the shares entitled to vote at an election of
                      directors. However, unless the entire board is removed, an
                      individual director may not be removed if the number of
                      shares voting against the removal would be sufficient to
                      elect a director if such shares were voted



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                      cumulatively at an annual election. If any directors are
                      so removed, new directors may be elected at the same
                      meeting.

Section 6.            Vacancies:

                      A vacancy occurring in the Board of Directors may be
                      filled by a majority of the remaining directors, even
                      though less than a quorum, or by the sole remaining
                      director; but a vacancy created by an increase in the
                      authorized number of directors shall be filled only by
                      election at an annual meeting or at a special meeting of
                      shareholders called for that purpose. The shareholders may
                      elect a director at any time to fill any vacancy not
                      filled by the directors. A director elected to fill a
                      vacancy shall be elected for the unexpired term of his
                      predecessor in office.

Section 7.            Chairman:

                      The President of the Corporation shall serve as Chairman
                      of the Board of Directors. He shall preside at all
                      meetings of the Board of Directors and perform such other
                      duties as may be directed by the Board.

Section 8.            Compensation:

                      The Board of Directors may compensate directors for their
                      services as such and may provide for the payment of all
                      expenses incurred by directors in attending regular and
                      special meetings of the Board.

Section 9.            Executive Committee: The Board of Directors may, by
                      resolution adopted by a majority of the number of
                      directors fixed by these bylaws, designate two or more
                      directors to constitute an Executive Committee, which
                      committee, to the extent provided in such resolution,
                      shall have and may exercise all the authority of the Board
                      of Directors in the management of the Corporation.

                                   ARTICLE IV

MEETINGS OF DIRECTORS:

Section 1.            Regular Meetings:

                      A regular meeting of the Board of Directors shall be held
                      immediately after, and at the same place as, the annual or
                      substitute annual meeting of shareholders.

                      In addition, the Board of Directors may provide by
                      resolution the time and place, either within or without
                      the State of North Carolina, for the holding of additional
                      regular meetings.

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Section 2.            Special Meetings:

                      Special meetings of the Board of Directors may be called
                      by, or at the request of, the President or any two
                      directors. Such meetings may be held either within or
                      without the State of North Carolina.

                      The person or persons calling a special meeting of the
                      Board of Directors shall, at least five days before the
                      meeting, give notice thereof by any usual means of
                      communication. Such notice need not specify the purpose
                      for which the meeting is called.

Section 3.            Waiver of Notice:

                      Any director may waive notice of any meeting. Attendance
                      by a director at a meeting shall constitute a waiver of
                      notice of such meeting except where a director attends a
                      meeting for the express Purpose of objecting to the
                      transaction of any business because the meeting is not
                      lawfully called or convened.

Section 4.            Quorum:

                      A majority of the duly elected or appointed and qualified
                      directors of the Corporation shall constitute a quorum for
                      the transaction of business at any meeting of the Board of
                      Directors. A majority of the directors present at any
                      meeting, whether or not a quorum is present, may adjourn
                      the meeting from time to time without notice, other than
                      announcement at the meeting, until a quorum shall attend.

Section 5.            Manner of Acting:

                      Except as otherwise provided in these bylaws, the act of
                      the majority of the directors present at a meeting at
                      which a quorum is present shall be the act of the Board of
                      Directors.

                      The vote of a majority of the duly elected or appointed
                      and qualified directors of the Corporation shall be
                      required to adopt a resolution constituting the Executive
                      Committee. The vote of a majority of the directors then
                      holding office shall be required to adopt, amend, or
                      repeal a bylaw, or to adopt a resolution dissolving the
                      Corporation without resolution of the shareholders.

Section 6.            Informal Action By Directors:

                      Action taken by a majority of the directors without a
                      meeting is, nevertheless, Board action if written consent
                      to the action in question is signed by all the directors
                      and filed with the minutes of the proceedings of the
                      Board, whether done before or after the action so taken.

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                                    ARTICLE V

OFFICERS:

Section 1.            Number:

                      The Corporation shall have a President, a Secretary, a
                      Treasurer, and such Vice Presidents, Assistant
                      Secretaries, Assistant Treasurers, and other officers as
                      the Board of Directors may from time to time elect. Any
                      two or more offices may be held by the same person, except
                      the office of President and Secretary. However, no officer
                      shall execute, acknowledge, or verify any instrument in
                      more than one capacity if such instrument is required by
                      law, by the Articles of Incorporation, or the bylaws to be
                      executed, acknowledged, or verified by two or more
                      officers. If there is more than one Vice President, the
                      Board of Directors may designate their seniority (such as
                      First Vice President, Senior Vice President, etc.) and/or
                      the particular department of the Corporation of which they
                      shall have charge.

Section 2.            Election And Term:

                      The officers of the Corporation shall be elected by the
                      Board of Directors. Such elections may be held at any
                      regular or special meeting of the Board. Each officer
                      shall hold office until his death, resignation,
                      retirement, removal, disqualification, or until his
                      successor is elected and qualified, unless otherwise
                      specified by the Board of Directors. The Board of
                      Directors may fill any vacancy in any office occurring for
                      whatever reason.

Section 3.            Removal:

                      Any officer or agent elected or appointed by the Board of
                      Directors may be removed by the Board with or without
                      cause but such removal shall be without prejudice to the
                      contract rights, if any, of the person so removed.

Section 4.            Compensation:

                      The compensation of all officers of the Corporation shall
                      be fixed by the Board of Directors.

Section 5.            President:

                      The President shall be the chief executive officer of the
                      Corporation and shall preside at all meetings of the
                      shareholders and of the Board of Directors. Subject to the
                      direction and control of the Board of Directors and the
                      Executive Committee, if created, he shall have general
                      charge and authority over the business of the Corporation.
                      He shall make reports regarding the business and
                      activities of the Corporation for the preceding fiscal
                      year to the shareholders at each annual meeting. He shall
                      sign with any other proper officer certificates for shares
                      of the Corporation and any deeds, mortgages, bonds,
                      contracts, or other instruments which may be lawfully
                      executed on behalf of the Corporation except where
                      required or permitted by law to be


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                      otherwise signed and executed and except where the signing
                      and execution thereof shall be delegated by the Board of
                      Directors to some other officer or agent. In general, he
                      shall perform all duties incident to the office of
                      President and such other duties as may be prescribed by
                      the Board of Directors from time to time.

Section 6.            Vice President:

                      The Vice President, or if there is more than one, the Vice
                      Presidents in order of their seniority by designation, (or
                      if not designated, in the order of their seniority by
                      election) shall perform the duties of the President in his
                      absence or during his disability to act. The Vice
                      Presidents shall have such other duties and powers as may
                      be assigned to or vested in them by the Board of
                      Directors, the Executive Committee or the President.

Section 7.            Secretary:

                      The Secretary shall keep accurate records of the acts and
                      proceedings of all meetings of the shareholders and
                      directors. He shall give all notices required by law and
                      these bylaws. He shall have general charge of the
                      corporate books and records of the Corporation and of the
                      corporate seal. He shall affix the corporate seal to any
                      lawfully executed instrument requiring it. He shall have
                      general charge of the stock transfer books of the
                      Corporation and shall keep at the registered or principal
                      office of the Corporation the record of shareholders
                      showing the name and address of each shareholder and the
                      number and class of the shares held by each. He shall sign
                      such instruments as may require his signature and, in
                      general, shall perform all duties incident to the office
                      of Secretary and such duties as may be assigned to him
                      from time to time by the President, the Executive
                      Committee, or the Board of Directors.

Section 8.            Treasurer:

                      The Treasurer shall have custody of all funds and
                      securities belonging to the Corporation and shall receive,
                      deposit or disburse the same under the direction of the
                      Board of Directors or the Executive Committee. He shall
                      keep full and accurate accounts of the finances of the
                      Corporation in books especially provided for that purpose
                      and he shall cause a true statement of its assets and
                      liabilities as of the close of each fiscal year and of the
                      results of its operations and of changes in surplus for
                      each fiscal year, all in reasonable detail, including
                      particulars as to convertible securities then outstanding,
                      to be made and filed within four months after the end of
                      such fiscal year. The statement so filed shall be kept
                      available for inspection for a period of ten years; and
                      the Treasurer shall mail or deliver a copy of the latest
                      such statement to any shareholder upon his written request
                      therefor. The Treasurer shall, in general, perform all
                      duties incident to his office and such other duties as may
                      be assigned to him from time to time by the President, the
                      Board of Directors, or the Executive Committee.

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Section 9.            Assistant Secretaries And Treasurers:

                      The Assistant Secretaries and Assistant Treasurers shall,
                      in the absence or disability of the Secretary or the
                      Treasurer respectively, perform the duties and exercise
                      the powers of those offices and they shall, in general,
                      perform such other duties as shall be assigned to them by
                      the Secretary or the Treasurer respectively, or by the
                      President, the Board of Directors, or the Executive
                      Committee.

Section 10.           Bonds:

                      The Board of Directors may, by resolution, require any or
                      all officers, agents, and employees of the Corporation to
                      give bond to the Corporation, with sufficient sureties,
                      conditioned on the faithful performance of the duties of
                      their respective offices or positions and to comply with
                      such other conditions as may from time to time be required
                      by the Board of Directors.

                                   ARTICLE VI

CONTRACTS LOANS, AND DEPOSITS:

Section 1.            Contracts:

                      The Board of Directors or Executive Committee may
                      authorize any officer or officers, agent or agents, to
                      enter into any contract or execute and deliver any
                      instrument on behalf of the Corporation and such authority
                      may be general or confined to specific instances.

Section 2.            Loans:

                      No loans shall be contracted on behalf of the Corporation
                      and no evidence of indebtedness shall be issued in its
                      name unless otherwise authorized by resolution of the
                      Board of Directors or the Executive Committee. Such
                      authority may be general or confined to specific
                      instances.

Section 3.            Checks And Drafts:

                      All checks, drafts or other orders for the payment of
                      money issued in the name of the Corporation shall be
                      signed by such officer or officers, agent or agents, of
                      the Corporation in such manner as shall from time to time
                      be determined by the Board of Directors or the Executive
                      Committee.

Section 4.            Deposits:

                      All funds of the Corporation not otherwise employed, shall
                      be deposited from time to time to the credit of the
                      Corporation in such depositories as the Board of Directors
                      shall direct.

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                                   ARTICLE VII

CERTIFICATES FOR SHARES AND THEIR TRANSFER:

Section 1.            Certificates For Shares:

                      Certificates representing shares of the Corporation shall
                      be issued in such form as the Board of Directors shall
                      determine to every shareholder for the fully paid shares
                      owned by him. These certificates shall be signed by the
                      President or any Vice President and by the Secretary,
                      Assistant Secretary, Treasurer or Assistant Treasurer.
                      They shall be consecutively numbered or otherwise
                      identified and the name and address of the persons to whom
                      they are issued, with the number of shares and date of
                      issue, shall be entered on the stock transfer books of the
                      Corporation.

Section 2.            Transfer of Shares:

                      Transfer of shares shall be made on the stock transfer
                      books of the Corporation only upon the surrender of the
                      certificates for the shares sought to be transferred by
                      the record holder thereof or by his duly authorized agent,
                      transferee or legal representative.

                      All certificates surrendered for transfer shall be
                      cancelled before new certificates for the transferred
                      shares shall be issued.

Section 3.            Closing Transfer Books And Fixing Record Date:

                      For the purpose of determining shareholders entitled to
                      notice of or to vote at any meeting of shareholders or any
                      adjournment thereof or entitled to receive payment of any
                      dividend or, in order to make a determination of
                      shareholders for any other purpose, the Board of Directors
                      may provide that the stock transfer books may be closed
                      for a stated period, but not to exceed, in any case, fifty
                      days. If the stock transfer books shall be closed for the
                      purpose of determining shareholders entitled to notice of
                      or to vote at a meeting of shareholders, such books shall
                      be closed for at least ten days immediately preceding such
                      meeting.

                      In lieu of closing the stock transfer books, the Board of
                      Directors may fix in advance a date as the record date for
                      any such determination of shareholders, such record date
                      in any case to be not more than fifty days and, in case of
                      a meeting of shareholders, not less than ten days
                      immediately preceding the date on which the particular
                      action requiring such determination of shareholders is to
                      be taken.

                      If the stock transfer books are not closed and no record
                      date is fixed for the determination of shareholders
                      entitled to notice of or to vote at a meeting of
                      shareholders or shareholders entitled to receive payment
                      of a dividend, the date on which notice of the meeting is
                      mailed or the date on which the


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                      resolution is adopted, as the case may be, shall be the
                      record date for such determination of shareholders.

Section 4.            Lost Certificates:

                      The Board of Directors may authorize the issuance of a new
                      share certificate in place of a certificate claimed to
                      have been lost or destroyed upon receipt of an affidavit
                      of such fact from the person claiming such loss or
                      destruction. When authorizing such issuance of a new
                      certificate, the Board may require the claimant to give
                      bond in such sum as it may direct to indemnify the
                      Corporation against loss from any claim with respect to
                      the certificate claimed to have been lost or destroyed or
                      the Board may, by resolution reciting that the
                      circumstances justify such action, authorize the issuance
                      of the new certificate without requiring such bond.


                                  ARTICLE VIII

GENERAL PROVISIONS:

Section 1.            Dividends:

                      The Board of Directors may from time to time declare, and
                      the Corporation may pay, dividends on its outstanding
                      shares in the manner and upon the terms and conditions
                      provided by law or by its charter.

Section 2.            Waiver of Notice:

                      Whenever any notice is required to be given to any
                      shareholder or director under the provisions of the North
                      Carolina Business Corporation Act or under the provisions
                      of the charter or bylaws of this Corporation, a waiver
                      thereof in writing signed by the person or persons
                      entitled to such notice, whether before or after the time
                      stated therein, shall be equivalent to the giving of such
                      notice.

Section 3.            Indemnification:

                      Any person who at any time serves or has served as a
                      director, officer, employee or agent of the Corporation or
                      in such capacity at the request of the Corporation for any
                      other corporation, partnership, joint venture, trust or
                      other enterprise, shall have a right to be indemnified by
                      the Corporation to the fullest extent permitted by law
                      against (a) reasonable expenses, including attorney's
                      fees, actually and necessarily incurred by him in
                      connection with any threatened, pending or completed
                      action, suit or proceedings, whether civil, criminal,
                      administrative or investigative, and whether or not
                      brought by or on behalf of the Corporation seeking to hold
                      him liable by reason of the fact that he is or was acting
                      in such capacity, and (b) reasonable payments made by him
                      in satisfaction of any judgment, money decree, fine,
                      penalty or settlement for which he may have become liable
                      in any such action, suit or proceeding.



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                      The Board of Directors of the Corporation shall take all
                      such action as may be necessary and appropriate to
                      authorize the Corporation to pay the indemnification
                      required by this bylaw, including without limitation, to
                      the extent needed, making a good faith evaluation of the
                      manner in which the claimant for indemnity acted and of
                      the reasonable amount of indemnity due him and giving
                      notice to, and obtaining approval by, the shareholders of
                      the Corporation.

                      Any person who at any time after the adoption of this
                      bylaw serves or has served in any of the aforesaid
                      capacities for or on behalf of the Corporation shall be
                      deemed to be doing or to have done so in reliance upon,
                      and as consideration for, the right of indemnification
                      provided herein. Such right shall inure to the benefit of
                      the legal representatives of any such person and shall not
                      be exclusive of any other rights to which such person may
                      be entitled apart from the provision of this bylaw.

Section 4.            Fiscal Year:

                      Unless otherwise ordered by the Board of Directors, the
                      fiscal year of the Corporation shall be the calendar year.

Section 5.            Amendments:

                      Except as otherwise provided herein, these bylaws may be
                      amended or repealed and new bylaws may be adopted by the
                      affirmative vote of a majority of the directors then
                      holding office at any regular or special meeting of the
                      Board of Directors.

                      The Board of Directors shall have no power to adopt a
bylaw:

                      (1)           requiring more than a majority of the voting
                                    shares for a quorum at a meeting of
                                    shareholders or more than a majority of the
                                    votes cast to constitute action by the
                                    shareholders, except where higher
                                    percentages are required by law;

                      (2)           providing for the management of the
                                    Corporation otherwise than by the Board of
                                    Directors or its Executive Committee;

                      (3)           increasing or decreasing the number of
                                    directors;

                      (4)           classifying and staggering the election of
                                    directors;


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                      No bylaws adopted or amended by the shareholders shall be
                      altered or repealed by the Board of Directors, except to
                      the extent that such bylaw expressly authorizes its
                      amendment or repeal by the Board of Directors.

BYLAWS OF METRO RADIOLOGY MANAGEMENT SERVICES, INC.

ADOPTED AS OF APRIL 28, 1989

ATTEST:                 /s/
       ----------------------------------------
       (Secretary of Organizational Meeting)

sh:JWA

METRObyl


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