SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549
                                 --------------
                                  SCHEDULE 13D
                                 (RULE 13D-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13D-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13D-2(a)

                                 (Amendment No.)

                             RADIOLOGIX INCORPORATED
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                                (Name of Issuer)
                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
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                         (Title of Class of Securities)
                                    75040K109
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                                 (CUSIP Number)

                              Marc Weingarten, Esq.
                            SCHULTE, ROTH & ZABEL LLP
                                919 Third Avenue
                            New York, New York 10022
                                 (212) 758-2000
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                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                January 27, 2003
     -----------------------------------------------------------------------
             (Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G
to report the acquisition that is the subject of this Schedule 13D, and is
filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box |_|. NOTE. Schedules filed in paper format shall include a signed
original and five copies of the schedule, including all exhibits. SEE Rule 13d-7
for other parties to whom copies are to be sent.
--------
1 The remainder of this cover page shall be filled out for a
reporting person's initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information which
would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page
shall not be deemed to be "filed" for the purpose of Section 18 of the
Securities Exchange Act of 1934 or otherwise subject to the liabilities of that
section of the Act but shall be subject to all other provisions of the Act
(however, SEE the NOTES).


                               (page 1 of 6 pages)



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CUSIP No. 75040K109                     13D          Page 2 of 6 Pages
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=======================================================================
     1  NAME OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
                                JANA PARTNERS LLC
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     2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*    (a) |_|


                                                             (b) |_|
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     3  SEC USE ONLY
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     4  SOURCE OF FUNDS*
                                       WC
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     5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
        PURSUANT TO ITEM 2(d) OR 2(e)                            |_|
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     6  CITIZENSHIP OR PLACE OF ORGANIZATION
                                DELAWARE
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 NUMBER OF         7      SOLE VOTING POWER
   SHARES
BENEFICIALLY                    1,558,174
  OWNED BY
    EACH
 REPORTING
PERSON WITH    --------------------------------------------------------
                   8      SHARED VOTING POWER
                                -0-
               --------------------------------------------------------
                   9      SOLE DISPOSITIVE POWER
                                1,558,174
               --------------------------------------------------------
                  10      SHARED DISPOSITIVE POWER
                                -0-
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     11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                1,558,174
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     12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
         CERTAIN SHARES*                                         |_|
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     13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
                                7.22 %
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     14        TYPE OF REPORTING PERSON*
                                IA
================================================================================

                      SEE INSTRUCTIONS BEFORE FILLING OUT!*



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CUSIP No. 75040K109                       13D        Page 3 of 6 Pages
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The following constitutes the Schedule 13D filed by the undersigned (the
"Schedule 13D").

Item 1.           Security and Issuer.
                  -------------------

This statement relates to shares (the "Shares") of the common stock, par value
$0.01 per share ("Common Stock"), of Radiologix Incorporated (the "Issuer"). The
principal executive offices of the Issuer are located at 3600 JP Morgan Chase
Tower, 2200 Ross Avenue, Dallas, TX 75201

Item 2.           Identity and Background.
                  -----------------------

                  (a) This Statement is filed by JANA Partners LLC, a Delaware
limited liability company (the "Reporting Person"). JANA Partners LLC is a
private money management firm which holds the Common Stock of the Issuer in
various accounts under its management and control. The principals of JANA
Partners LLC are Barry Rosenstein and Gary Claar (the "Principals").

                  (b) The principal business address of the Reporting Person and
the Principals is 536 Pacific Avenue, San Francisco, California 94133.

                  (c) The principal business of the Reporting Person and the
Principals is investing for accounts under their management.

                  (d) Neither the Reporting Person nor the Principals has,
during the last five years, been convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors).

                  (e) Neither the Reporting Person nor the Principals has,
during the last five years, been party to a civil proceeding of a judicial or
administrative body of competent jurisdiction and as a result of such proceeding
was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, federal or
state securities laws or finding any violation with respect to such laws.

                  (f) The Reporting Person is a limited liability company
organized in Delaware. The Principals are citizens of
the United States of America.


Item 3.           Source and Amount of Funds or Other Consideration.
                  -------------------------------------------------

The aggregate purchase price of the 1,558,174 Shares of Common
Stock owned beneficially by JANA Partners LLC is $ 3,992,233. Such Shares of
Common Stock were acquired with investment funds in accounts under management.



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CUSIP No. 75040K109                       13D        Page 4 of 6 Pages
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Item 4.           Purpose of Transaction.
                  ----------------------

                  JANA Partners LLC purchased the Shares based on its belief
that the Shares at current market prices are undervalued and represent an
attractive investment opportunity. Depending upon overall market conditions,
other investment opportunities available to the Reporting Person, and the
availability of Shares of Common Stock at prices that would make the purchase of
additional Shares desirable, the Reporting Person may endeavor to increase their
position in the Issuer through, among other things, the purchase of Shares of
Common Stock on the open market or in private transactions or otherwise, on such
terms and at such times as the Reporting Persons may deem advisable.

                  Neither the Reporting Person nor the Principals has any
present plan or proposal which would relate to or result in any of the matters
set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D except as set
forth herein or such as would occur upon completion of any of the actions
discussed above. The Reporting Person intends to review its investment in the
Issuer on a continuing basis and engage in discussions with management and the
Board of Directors of the Issuer concerning the business, operations and future
plans of the Issuer. Depending on various factors including, without limitation,
the Issuer's financial position and investment strategy, the price levels of the
Common Stock, conditions in the securities market and general economic and
industry conditions, JANA Partners LLC may in the future take such actions with
respect to its investment in the Issuer as it deems appropriate including,
without limitation, communicating with other stockholders, seeking Board
representation, making proposals to the Issuer concerning the capitalization and
operations of the Issuer, purchasing additional Shares of Common Stock or
selling some or all of its Shares or changing its intention with respect to any
and all matters referred to in Item 4.


Item 5.           Interest in Securities of the Issuer.
                  ------------------------------------

(a) The aggregate percentage of Shares of Common Stock
reported owned beneficially by the Reporting Person is based upon 21,567,153
Shares outstanding, which is the total number of Shares of Common Stock
outstanding as reported in the Issuer's Quarterly Report on Form 10-Q for the
quarter ended September 30, 2002.

As of the close of business on February 5, 2003, JANA Partners
LLC beneficially owned 1,558,174 Shares of Common Stock, constituting
approximately 7.22% of the Shares outstanding.

(b) The Reporting Person has sole voting and dispositive powers with respect to
the Shares reported herein, which powers are exercised by the Principals. All of
such Shares were acquired in open-market transactions.



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CUSIP No. 75040K109                       13D         Page 5 of 6 Pages
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(c) Schedule A annexed hereto lists all transactions in the Issuer's Common
Stock in the last sixty days by the Reporting Person. (d) No person other than
the Reporting Person is known to have the right to receive, or the power to
direct the receipt of dividends from, or proceeds from the sale of, such Shares
of the Common Stock.

(e) Not applicable.

Item 6.   Contracts, Arrangements, Understandings or Relationships With
          Respect to Securities of the Issuer.
          -------------------------------------------------------------
Other than as described herein, there are no contracts,
arrangements or understandings between the Reporting Person and any other
Person, with respect to the securities of the Issuer.


Item 7.   Material to be Filed as Exhibits.
          --------------------------------

          None.


                                   SIGNATURES


After reasonable inquiry and to the best of his knowledge and belief, the
undersigned certifies that the information set forth in this statement is true,
complete and correct.


Dated:   February 6, 2003                       JANA PARTNERS LLC


                                           By:  /s/ BARRY S. ROSENSTEIN
                                                -----------------------
                                                Barry S. Rosenstein
                                                Managing Partner



                                           By:  /s/ GARY CLAAR
                                                -------------------
                                                Gary Claar
                                                Managing Director




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CUSIP No. 75040K109                       13D         Page 6 of 6 Pages
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                                   SCHEDULE A

               Transactions in the Shares During the Past 60 Days
               --------------------------------------------------
 Shares of Common Stock           Price Per                 Date of
       Purchased (Sold)            Share($)             Purchase (Sale)
       -----------                ---------             --------------

                                JANA PARTNERS LLC
                             -----------------------

         620,000                     2.5188                 12/19/02
          35,000                     2.1707                 12/20/02
          22,000                     2.0564                 12/24/02
          55,000                     2.0349                 12/26/02
           8,000                     2.0500                 12/30/02
         110,000                     2.1955                 12/31/02
          20,000                     2.4264                 01/02/03
           4,600                     2.1233                 01/22/03
          50,200                     2.1897                 01/23/03
          18,000                     2.1576                 01/24/03
         152,800                     2.1620                 01/27/03
          92,200                     2.1803                 01/28/03
          26,400                     2.1599                 01/29/03
          11,300                     2.1839                 01/30/03
           1,400                     2.2000                 01/31/03
          69,300                     2.3449                 02/03/03
          89,300                     2.3996                 02/04/03
          42,300                     2.4633                 02/05/03