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                                                                     EXHIBIT 4.5

                          SECOND SUPPLEMENTAL INDENTURE

            This Second Supplemental Indenture, dated as of December 20, 2002
(this "SUPPLEMENTAL INDENTURE" or "GUARANTEE"), among Brunswick Diagnostic
Imaging, LLC, a Georgia limited liability company (the "GUARANTOR"), MedQuest,
Inc. (together with its successors and assigns, the "COMPANY"), MQ Associates,
Inc. ("HOLDINGS"), the subsidiaries of the Company party to the Indenture (as
hereinafter defined) (the "SUBSIDIARY GUARANTORS") and Wachovia Bank, National
Association, as Trustee under the Indenture referred to below.

                                   WITNESSETH:

            WHEREAS, the Company, Holdings, the Subsidiary Guarantors and the
Trustee have heretofore executed and delivered an Indenture, dated as of August
15, 2002 (as amended, supplemented, waived or otherwise modified, the
"INDENTURE"), providing for the issuance of an aggregate principal amount of
$180,000,000 of 11 7/8% Senior Subordinated Notes due 2012 of the Company (the
"SECURITIES")

            WHEREAS, SECTION 3.12 of the Indenture provides that unless such
Subsidiary has previously issued a Notes Guarantee which is then in full force
and effect, the Company is required to cause each Subsidiary that issues a
Guarantee in respect of obligations under a Credit Facility to execute and
deliver to the Trustee a supplemental indenture pursuant to which such
Restricted Subsidiary will unconditionally Guarantee, on a joint and several
basis with the other Guarantors, the full and prompt payment of, premium, if
any, and interest on the Securities; and

            WHEREAS, pursuant to SECTION 9.1 of the Indenture, the Trustee and
the Company are authorized to execute and deliver this Supplemental Indenture to
amend the Indenture, without the consent of any Securityholder;

            NOW, THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Guarantor, the Company, Holdings, the other Subsidiary Guarantors and the
Trustee mutually covenant and agree for the equal and ratable benefit of the
Holders of the Securities as follows:

                                    ARTICLE I

                                   DEFINITIONS

1.1   DEFINED TERMS.

      As used in this Supplemental Indenture, terms defined in the Indenture or
in the preamble or recital hereto are used herein as therein defined, except
that the term "HOLDERS" in this Guarantee shall refer to the term
"Securityholders" as defined in the Indenture and the Trustee acting on behalf
or for the benefit of such Holders. The words "herein," "hereof" and "hereby"
and other words of similar import used in this Supplemental Indenture refer to
this Supplemental Indenture as a whole and not to any particular section hereof.

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                                   ARTICLE II

                        AGREEMENT TO BE BOUND; GUARANTEE

2.1   AGREEMENT TO BE BOUND.

      The Guarantor hereby becomes a party to the Indenture as a Subsidiary
Guarantor and as such will have all of the rights and be subject to all of the
obligations and agreements of a Subsidiary Guarantor under the Indenture. The
Guarantor agrees to be bound by all of the provisions of the Indenture
applicable to a Subsidiary Guarantor and to perform all of the obligations and
agreements of a Subsidiary Guarantor under the Indenture.

2.2   GUARANTEE.

      The Guarantor as of the Guarantor Effective Date (as hereinafter defined)
hereby fully, unconditionally and irrevocably guarantees, as primary obligor and
not merely as surety, jointly and severally with each other Subsidiary
Guarantor, to each Holder of the Securities and the Trustee, the full and
punctual payment when due, whether at maturity, by acceleration, by redemption,
or otherwise, of the Obligations pursuant to ARTICLE XI of the Indenture.

                                   ARTICLE III

                                  MISCELLANEOUS

3.1   NOTICES.

      All notices and other communications to the Guarantor shall be given as
provided in the Indenture to the Guarantor, at its address set forth below, with
a copy to the Company as provided in the Indenture for notices to the Company.

3.2   PARTIES.

      Nothing expressed or mentioned herein is intended or shall be construed to
give any Person, firm or corporation, other than the Holders and the Trustee,
any legal or equitable right, remedy or claim under or in respect of this
Supplemental Indenture or the Indenture or any provision herein or therein
contained.

3.3   GOVERNING LAW.

      This Supplemental Indenture shall be governed by, and construed in
accordance with, the laws of the State of New York.

3.4   SEVERABILITY CLAUSE.

      In case any provision in this Supplemental Indenture shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby and
such provision shall be ineffective only to the extent of such invalidity,
illegality or unenforceability.

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3.5   RATIFICATION OF INDENTURE; SUPPLEMENTAL INDENTURES PART OF INDENTURE.

      Except as expressly amended hereby, the Indenture is in all respects
ratified and confirmed and all the terms, conditions and provisions thereof
shall remain in full force and effect. This Supplemental Indenture shall form a
part of the Indenture for all purposes, and every Holder of Securities
heretofore or hereafter authenticated and delivered shall be bound hereby. The
Trustee makes no representation or warranty as to the validity or sufficiency of
this Supplemental Indenture.

3.6   COUNTERPARTS.

      The parties hereto may sign one or more copies of this Supplemental
Indenture in counterparts, all of which together shall constitute one and the
same agreement.

3.7   HEADINGS.

      The headings of the Articles and the sections in this Supplemental
Indenture are for convenience of reference only and shall not be deemed to alter
or affect the meaning or interpretation of any provisions hereof.

3.8   ADDITIONAL DEFINITIONS.

      As used in this Second Supplemental Indenture, "GUARANTOR EFFECTIVE DATE"
shall mean December 20, 2002.

                            [signature page follows]

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            IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the date first above written.

                                    BRUNSWICK DIAGNOSTIC IMAGING, LLC,
                                    as a Guarantor

                                    By: /s/ J. KENNETH LUKE
                                        -------------------
                                        Name:  J. Kenneth Luke
                                        Title: Manager

                                    WACHOVIA BANK NATIONAL
                                    ASSOCIATION, as Trustee

                                    By: /s/ ERIC J. KNOLL
                                        -----------------
                                        Name:  Eric J. Knoll
                                        Title: Assistant Vice President

                                    MEDQUEST, INC.

                                    By: /s/ J. KENNETH LUKE
                                        -------------------
                                        Name:  J. Kenneth Luke
                                        Title: President

                                    MQ ASSOCIATES, INC.

                                    By: /s/ J. KENNETH LUKE
                                        -------------------
                                        Name:  J. Kenneth Luke
                                        Title: President

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<Table>

<S>                                                  <C>
IMAGING SERVICES OF ALABAMA, INC.                    KENOSHA DIAGNOSTIC IMAGING, INC.
ANDERSON DIAGNOSTIC IMAGING, INC.                    LEXINGTON OPEN MRI, INC.
ASHEVILLE OPEN MRI, INC.                             MECKLENBURG OPEN MRI, INC.
BIOIMAGING AT CHARLOTTE, INC.                        MEDQUEST ASSOCIATES, INC.
BIOIMAGING AT HARDING, INC.                          MISSOURI IMAGING, INC.
BIOIMAGING OF COOL SPRINGS, INC.                     MOBILE OPEN MRI, INC.
CABARRUS DIAGNOSTIC IMAGING, INC.                    OCCUPATIONAL SOLUTIONS, INC.
CAPE FEAR DIAGNOSTIC IMAGING, INC.                   PALMETTO IMAGING, INC.
CAROLINA IMAGING, INC. OF FAYETTEVILLE               PHOENIX DIAGNOSTIC IMAGING, INC.
CHAPEL HILL DIAGNOSTIC IMAGING, INC.                 PIEDMONT IMAGING, INC. (FORSYTH)
CHATTANOOGA DIAGNOSTIC IMAGING, INC.                 PIEDMONT IMAGING, INC. (SPARTANBURG)
DOTHAN DIAGNOSTIC IMAGING, INC.                      OPEN MRI & IMAGING OF RICHMOND, INC.
FLORIDA DIAGNOSTIC IMAGING CENTER, INC.              SOUTH CAROLINA DIAGNOSTIC IMAGING, INC.
OPEN MRI OF GEORGIA, INC.                            SUN VIEW HOLDINGS, INC.
OPEN MRI & IMAGING OF GEORGIA, INC.                  TEXAS IMAGING SERVICES OF EL PASO, INC.
GROVE DIAGNOSTIC IMAGING CENTER, INC.                TRIAD IMAGING, INC.
KANSAS DIAGNOSTIC IMAGING, INC.                      TYSON'S CORNER DIAGNOSTIC IMAGING, INC.
NORTHEAST COLUMBIA DIAGNOSTIC IMAGING, INC.          VIRGINIA DIAGNOSTIC IMAGING, INC.
WISCONSIN DIAGNOSTIC IMAGING, INC.                   OPEN MRI OF THE CAROLINAS, INC.
VIENNA DIAGNOSTIC IMAGING, INC.

On behalf of each of the entities listed above:      On behalf of each of the entities listed above:
</Table>

By:  /s/ J. KENNETH LUKE                             By:  /s/ J. KENNETH LUKE
     -------------------                                  -------------------
     Name:  J. Kenneth Luke                               Name:  J. Kenneth Luke
     Title: President                                     Title: President

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<Table>
<S>                                                  <C>
OPEN MRI & IMAGING OF ALBANY, LLC                    WOODSTOCK DIAGNOSTIC IMAGING, LLC
OPEN MRI & IMAGING OF ATHENS, LLC                    DIAGNOSTIC IMAGING OF HIRAM, LLC
ATHENS MRI, LLC                                      DIAGNOSTIC IMAGING OF MARIETTA, LLC
OPEN MRI OF ATLANTA, LLC                             MONTGOMERY OPEN MRI, LLC
BUCKHEAD DIAGNOSTIC IMAGING, LLC                     NORWOOD DIAGNOSTIC IMAGING, LLC
OPEN MRI OF CENTRAL GEORGIA, LLC                     COASTAL IMAGING, LLC
IMAGING CENTER OF CENTRAL GEORGIA, LLC               DURHAM DIAGNOSTIC IMAGING, LLC
OPEN MRI & IMAGING OF CONYERS, LLC                   JACKSONVILLE DIAGNOSTIC IMAGING, LLC
CUMMING DIAGNOSTIC IMAGING, LLC                      CAPE IMAGING, L.L.C.
OPEN MRI & IMAGING OF DEKALB, LLC                    BRIDGETON MRI AND IMAGING CENTER, LLC
DULUTH DIAGNOSTIC IMAGING, LLC                       KIRKWOOD MRI AND IMAGING CENTER, LLC
DULUTH CT CENTER, LLC                                ST. PETERS MRI & IMAGING CENTER, LLC
DIAGNOSTIC IMAGING OF ATLANTA, LLC                   OPEN MRI & IMAGING OF RICHMOND, LLC
OPEN MRI & IMAGING OF NORTH FULTON, LLC              RICHMOND WEST END DIAGNOSTIC IMAGING, LLC
OPEN MRI & IMAGING OF N.E. GEORGIA, LLC              CAROLINA MEDICAL IMAGING, LLC
DIAGNOSTIC IMAGING OF GEORGIA, LLC                   OPEN MRI OF SIMPSONVILLE, LLC
MIDTOWN DIAGNOSTIC IMAGING, LLC                      SIMPSONVILLE OPEN MRI, LLC
OPEN MRI & IMAGING OF DOUGLASVILLE, LLC              EAST COOPER DIAGNOSTIC IMAGING, LLC
HAPEVILLE DIAGNOSTIC IMAGING, LLC                    FARMFIELD DIAGNOSTIC IMAGING, LLC
OPEN MRI & IMAGING OF MACON, LLC                     FORT MILL DIAGNOSTIC IMAGING, LLC
OPEN MRI AND IMAGING OF SNELLVILLE, LLC              TRICOM DIAGNOSTIC IMAGING, LLC
WEST PACES DIAGNOSTIC IMAGING, LLC                   WEST ASHLEY DIAGNOSTIC IMAGING, LLC
TOWN & COUNTRY OPEN MRI, LLC                         CLAYTON OPEN MRI, LLC

On behalf of each of the entities listed above:      On behalf of each of the entities listed above:
</Table>

By:  /s/ J. KENNETH LUKE                             By:  /s/ J. KENNETH LUKE
     -------------------                                  -------------------
     Name:  J. Kenneth Luke                               Name:  J. Kenneth Luke
     Title: Manager                                       Title: Manager

<Page>

                                    OPEN MRI & IMAGING OF FLORENCE, LLC
                                    OPEN MRI OF MYRTLE BEACH, LLC

                                    Palmetto Imaging, Inc., as sole member of
                                    each of the entities listed above

                                    By:  /s/ J. KENNETH LUKE
                                         -------------------
                                         Name:  J. Kenneth Luke
                                         Title: President<Page>

                                                                   EXHIBIT 10.13
STATE OF GEORGIA  )
                  )
FULTON COUNTY     )

                               RETAINER AGREEMENT

      THIS RETAINER AGREEMENT ("Agreement") is made and entered into as of
the 1st day of July, 2001, by and between WILLIAM T. CARLSON, Jr.
("Carlson"), and MQ ASSOCIATES, INC., a Delaware corporation, with its
principal offices in Alpharetta, Georgia ("Company").

                                    RECITALS

1.    Carlson is a licensed attorney, specializing in the field of health
      care law.

2.    Company is a corporation engaged in the business of owning and
      operating diagnostic imaging centers throughout the United States.

3.    The parties desire to enter into this Agreement in order that Carlson
      might provide certain legal and consulting services to Company in
      furtherance of Company's business objectives and to better ensure the
      success of the business.

NOW, THEREFORE, premises considered, the parties agree as follows:

                                    AGREEMENT

1.    ENGAGEMENT.  Company hereby retains Carlson, as its attorney and
      general legal counsel, and Carlson hereby agrees to represent Company
      as its attorney.

2.    LEGAL SERVICES TO BE PERFORMED. Carlson will perform legal services as
      general counsel for the Company. Carlson will be present and available to
      perform such services at Company's offices in Alpharetta, Georgia an
      average of four days per week. In addition, Carlson shall devote such time
      as is reasonably necessary to deal with the Company's legal affairs when
      he is not present at the Company's offices.

3.    FEES.  For the professional services rendered by Carlson, Company
      agrees to pay to Carlson the sum of Thirty Thousand Dollars ($30,000.00)
      per month, payable on the last day of each calendar month for services
      rendered during the preceding month.

4.    EXPENSES.  In addition to fees paid to Carlson, as provided, Company
      also agrees to reimburse all expenses properly incurred by Carlson in
      the course of this representation.  Expenses will include, but are not
      limited to, items such as filing fees, travel, lodging, meals,
      telephone calls, photocopying, facsimiles and courier services.  Major
      out-of-pocket

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      expenses (cost of consultants, experts, or outside counsel engaged on
      behalf of Company) may, in the alternative, be billed directly and
      forwarded to Company for payment.

5.    EXTRAORDINARY SERVICES.  From time to time during the term of this
      Agreement, Company intends to engage Carlson to perform extraordinary
      services, such as representing the Company in acquisitions and other
      transactions.  In the event that Company engages Carlson to perform
      such services, it shall pay Carlson an additional fee equal to one
      percent (1%) of the transaction's value if said transaction is
      $5,000,000 or less, three-quarters percent (3/4%) of the transaction's
      value if said transaction is $5,000,001-10,000,000, and one-half
      percent (1/2%) of the transaction's value if said transaction is
      greater than $10,000,000.

6.    TERM AND TERMINATION.

      A.    TERM.  The term of this Agreement shall always be two years and
            renew daily.

      B.    TERMINATION.  Company shall have the right to terminate this
            Agreement and Carlson's legal representation of the Company upon
            90 days' prior written notice unless there is a Change of
            Control.  Company shall be obligated to pay for all services and
            expenses rendered or incurred prior to the effective date of
            termination.  For purposes of this Agreement, the effective date
            of termination shall be the day following conclusion of the
            90-day notice period.

7.    CHANGE OF CONTROL.

      A.    RIGHT TO SEVERANCE BENEFITS.  Carlson shall be entitled to
            receive severance benefits from Company, as described below,
            if there is a Change in Control of Company during the term of
            this Agreement and Company's successor wishes to terminate this
            Agreement.

      B.    DESCRIPTION OF SEVERANCE BENEFITS.  In the event that Carlson
            becomes entitled to receive severance benefits as provided
            herein, Carlson shall be retained as Attorney of Record to
            Company for 12 months in anticipation of transitioning to other
            legal counsel ("Transition Period") and Carlson shall be entitled
            to his regular monthly retainer payment ($30,000) for each of the
            12 months during the Transition Period and the payment of any
            costs and expenses incurred by Carlson during the Transition
            Period.  Within 30 days of the conclusion of the Transition
            Period, Company shall pay to Carlson a lump sum payment equal to
            the product of Carlson's monthly retainer fee times 12 months
            ($360,000).

      C.    CHANGE IN CONTROL.  A "Change in Control" shall be deemed to have
            occurred as of the first day that any one or more of the
            following have occurred:

            i.    any person other than those persons in control of Company
                  as of the effective date of this Agreement shall become the
                  beneficial owner,

                                       2

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                  directly or indirectly, of securities of Company representing
                  50 percent or more of the combined voting power of Company's
                  then outstanding securities; or

            ii.   the persons constituting the Board of Directors of Company on
                  the effective date of this Agreement shall cease for any
                  reason to constitute at least 50 percent of the Board of
                  Directors of the Company; or

            iii.  the stockholders of Company shall approve a plan of complete
                  liquidation or an agreement for the sale or disposition of all
                  or substantially all of Company's assets, or a merger,
                  consolidation or reorganization of Company with or involving
                  any other entity, other than one that would result in the
                  voting securities of Company outstanding immediately prior
                  thereto continuing to represent 50.1 percent of the combined
                  voting power of the securities of Company or the surviving
                  entity.

8. MISCELLANEOUS.

      A.    HIPAA COMPLIANCE. To the extent required by and upon the compliance
            date of the Privacy Regulations promulgated by the United States
            Department of Health and Human Services and contained in 45 C.F.R.
            Parts 160 and 164 pursuant to the Health Insurance Portability and
            Accountability Act of 1996, 42 U.S.C. Sections 1320d-1329d-8 (the
            "Regulations"), the Parties shall enter into a mutually acceptable
            Business Associate (as that term is defined in the Regulations)
            Agreement whereby Carlson shall agree to only use and/or disclose
            protected health information in accordance with Business Associate
            provisions of the Regulations.

      B.    ACCESS TO BOOKS AND RECORDS. Upon written request of the Secretary
            of Health and Human Services or the Comptroller General or any of
            their duly authorized representatives, upon either party, the other
            party will make available those contracts, books, documents, and
            records necessary to verify the nature and extent of the costs of
            providing services under this Agreement. Such inspection shall be
            available up to four years after the rendering of such services. If
            either party carries out any of the duties of this Agreement through
            a subcontract with value of $10,000 or more over a 12-month period
            with a related individual or organization, that party agrees to
            include this requirement in any such subcontract. This section is
            included pursuant to and is governed by the requirements of Public
            Law 96-499, Sec. 952 [Sec. 1861(v)(1) of the Social Security Act]
            and the regulations promulgated thereunder. No attorney-client or
            other legal privilege will be deemed to have been waived by Company
            or by Carlson by virtue of this provision.

                                        3
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      C.    AMENDMENT. This Agreement may be amended or modified by an
            instrument in writing executed by all parties.

      D.    BENEFITS. This agreement shall inure to the benefit of and be
            binding upon the parties, their heirs, legal representatives,
            successors and assigns.

      E.    ATTORNEYS' FEES. In the event of any litigation arising out of this
            Agreement, the court may award to the prevailing party all
            reasonable costs and expenses, including reasonable attorneys' fees.

      F.    GOVERNING LAW. The laws of the State of Georgia shall govern this
            Agreement, the construction of its terms and the interpretation of
            the rights and duties of the parties.

      IN WITNESS WHEREOF, the parties have executed this Agreement as of the day
and year first above written.

                                    WILLIAM T. CARLSON, JR.

                                    /s/ William T. Carlson, Jr.
                                    --------------------------------

                                    MQ ASSOCIATES, INC.

                                    By:  /s/ Illegible
                                         ---------------------------
                                    Its: President
                                         ---------------------------

                                       4

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