Exhibit 3.57

                          CERTIFICATE OF INCORPORATION

                                       OF

                        SYNCOR ACQUISITION (VALLEY) CORP.

         The undersigned, a natural person, for the purpose of organizing a
corporation for conducting the business and promoting the purposes hereinafter
stated, under the provisions and subject to the requirements of the laws of the
State of Delaware (particularly Chapter 1, Title 8 of the Delaware Code and the
acts amendatory thereof and supplemental thereto, and known, identified, and
referred to as the "General Corporation Law of the State of Delaware"), hereby
certifies that:

         FIRST: The name of the corporation (hereinafter called the
"Corporation") is Syncor Acquisition (Valley) Corp.

         SECOND: The address, including street, number, city, and county, of the
registered office of the Corporation in the State of Delaware is 1013 Centre
Road, City of Wilmington 19805, County of New Castle; and the name of the
registered agent of the Corporation in the State of Delaware at such address is
Corporation Service Company.

         THIRD: The purpose of the Corporation shall be to promote any lawful
act or activity for which corporations may be organized under the General
Corporation Law of the State of Delaware.

         FOURTH: The total number of shares of stock which the Corporation shall
have authority to issue is 100. The par value of each of such shares is $0.05.
All such shares are of one class and are shares of Common Stock.

         FIFTH: The name and the mailing address of the incorporator are as
follows:



     NAME                             MAILING ADDRESS
- ---------------               ------------------------------
                           
Edwin A. Burgos               6464 Canoga Ave.
                              Woodland Hills, CA  91367-2407



         SIXTH: The Corporation is to have perpetual existence.

         SEVENTH: Whenever a compromise or arrangement is proposed between this
Corporation and its creditors or any class of them and/or between this
Corporation and its stockholders or any class of them, any court of competent
jurisdiction within the State of Delaware may, on the application in a summary
way of this Corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for this Corporation under
Section 291 of Title 8 of the Delaware Code or on the application of trustees
in dissolution or of any receiver or receivers appointed for this Corporation
under Section 291 of Title 8



of the Delaware Code order a meeting of the creditors or class of creditors,
and/or of the stockholders or class of stockholders of this Corporation, as the
case may be, to be summoned in such manner as the said court directs. If a
majority in number representing three fourths in value of the creditors or class
of creditors, and/or of the stockholders or class of stockholders of this
Corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this Corporation as consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors, and/or on all the
stockholders or class of stockholders, of this Corporation, as the case may be,
and also on this Corporation.

         EIGHTH: For the management of the business and for the conduct of the
affairs of the Corporation, and in further definition, limitation, and
regulation of the powers of the Corporation and of its directors and of its
stockholders or any class thereof, as the case may be, it is further provided:

                  1. The management of the business and the conduct of the
         affairs of the Corporation shall be vested in its Board of Directors.
         The number of directors which shall constitute the whole Board of
         Directors shall be fixed by, or in the manner provided in, the Bylaws.
         No election of directors need be by written ballot.

                  2. After the original or other Bylaws of the Corporation have
         been adopted, amended, or repealed, as the case may be, in accordance
         with the provisions of Section 109 of the General Corporation Law of
         the State of Delaware, and, after the Corporation has received any
         payment for any of its stock, the power to adopt, amend, or repeal the
         Bylaws of the Corporation may be exercised by the Board of Directors of
         the Corporation; provided, however, that any provision for the
         classification of directors of the Corporation for staggered terms
         pursuant to the provisions of subsection (d) of Section 141 of the
         General Corporation Law of the State of Delaware shall be set forth in
         an initial Bylaw or in a Bylaw adopted by the stockholders entitled to
         vote of the Corporation unless provisions for such classification shall
         be set forth in this certificate of incorporation.

                  3. Whenever the Corporation shall be authorized to issue only
         one class of stock, each outstanding share shall entitle the holder
         thereof to notice of, and the right to vote at, any meeting of
         stockholders. Whenever the Corporation shall be authorized to issue
         more than one class of stock, no outstanding share of any class of
         stock which is denied voting power under the provisions of the
         certificate of incorporation shall entitle the holder thereof to the
         right to vote at any meeting of stockholders except as the provisions
         of paragraph (2) of subsection (p) of Section 242 of the General
         Corporation Law of the State of Delaware shall otherwise require;
         provided, that no share of any such class which is otherwise denied
         voting power shall entitle the holder thereof to vote upon the increase
         or decrease in the number of authorized shares of said class.

                                       2


         NINTH: The personal liability of the directors of the Corporation is
hereby eliminated to the fullest extent permitted by the provisions of paragraph
(7) of subsection (b) of Section 102 of the General Corporation Law of the
State of Delaware, as the same may be amended and supplemented.

         TENTH: The Corporation shall, to the fullest extent permitted by the
provisions of Section 145 of the General Corporation Law of the State of
Delaware, as the same may be amended and supplemented, indemnify any and all
persons whom it shall have power to indemnify under said section from and
against any and all of the expenses, liabilities, or other matters referred to
in or covered by said section, and the indemnification provided herein shall not
be deemed exclusive of any other rights to which those indemnified may be
entitled under any Bylaw, agreement, vote of stockholders or disinterested
directors or otherwise, both as to action in his official capacity and as to
action in another capacity while holding such office, and shall continue as to a
person who has ceased to be a director, officer, employee, or agent and shall
inure to the benefit of the heirs, executors, and administrators of such a
person.

         ELEVENTH: From time to time any of the provisions of this certificate
of incorporation may be amended, altered, or repealed, and other provisions
authorized by the laws of the State of Delaware at the time in force may be
added or inserted in the manner and at the time prescribed by such laws, and all
rights at any time conferred upon the stockholders of the Corporation by this
certificate of incorporation are granted subject to the provisions of this
Article ELEVENTH.

Signed on December 15, 1997

/s/ Edwin A. Burgos
- ----------------------------------
Edwin A. Burgos
Incorporator

                                       3


                            CERTIFICATE OF AMENDMENT

                                       OF
                          CERTIFICATE OF INCORPORATION

                                       OF
                        SYNCOR ACQUISITION (VALLEY) CORP.

         Syncor Acquisition (Valley) Corp., a corporation organized and existing
under and by virtue of the General Corporation Law of the State of Delaware,
does hereby certify:

         1. The name of the corporation is Syncor Acquisition (Valley) Corp.
(hereinafter called the "Corporation");

         2. The Certificate of Incorporation of the Corporation is hereby
amended by deleting Article First thereof and substituting the following
therefore:

            "The name of the corporation (hereinafter called the "Corporation")
is Comprehensive Medical Imaging - Fairfax, Inc.

         3. The amendment of the certificate of incorporation herein certified
has been duly adopted in accordance with the provisions of Sections 228 and 242
of the General Corporation Law of the State of Delaware.

         Executed on this 22nd day of September, 1998.

                                     /s/ Wayne K. Baldwin
                                     -------------------------------------------
                                     Wayne K. Baldwin
                                     Secretary



                      CERTIFICATE OF CHANGE OF LOCATION OF
                    REGISTERED OFFICE AND OF REGISTERED AGENT

It is hereby certified that:

         1. The name of the corporation (hereinafter called the "Corporation")
is Comprehensive Medical Imaging-Fairfax, Inc.

         2. The registered office of the Corporation within the State of
Delaware is hereby changed to 9 East Loockerman Street, City of Dover 19901,
County of Kent.

         3. The registered agent of the Corporation within the State of Delaware
is hereby changed to National Registered Agents, Inc., the business office of
which is identical with the registered office of the corporation as hereby
changed.

         4. The Corporation has authorized the changes hereinbefore set forth by
resolution of its Board of Directors.

Signed on March 6, 2000.

                                  COMPREHENSIVE MEDICAL IMAGING-FAIRFAX, INC.

                                  By: /s/ Wayne K. Baldwin
                                      ------------------------------------------
                                      Wayne K. Baldwin



                      CERTIFICATE OF CHANGE OF LOCATION OF
                    REGISTERED OFFICE AND OF REGISTERED AGENT

                   COMPREHENSIVE MEDICAL IMAGING-FAIRFAX, INC.

It is hereby certified that:

         1. The name of the corporation (hereinafter called the "corporation")
is

                   COMPREHENSIVE MEDICAL IMAGING-FAIRFAX, INC.

         2. The registered office of the corporation within the State of
Delaware is hereby changed to 2711 Centerville Road, Suite 400, City of
Wilmington 19808, County of New Castle.

         3. The registered agent of the corporation within the State of Delaware
is hereby changed to Corporation Service Company, the business office of which
is identical with the registered office of the corporation as hereby changed.

         4. The corporation has authorized the changes hereinbefore set forth by
resolution of its Board of Directors.

Signed on May 16, 2003

                                     /s/ Robin Smith Hoke
                                     -------------------------------------------
                                     Name: Robin Smith Hoke
                                     Title: Vice President