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| RADNET      MANAGEMENT, INC. |                                                                    |                      |         |
|------------------------------|-------------------------------------------------------------------------|---------------------------|--------------|
|                         |                                                                    |                      |         |
|                         | By:                                                                | /s/      Howard G. Berger |         |
|                         | Name:       Howard      G. Berger, M.D.                            |                      |
|                         | Title:  President                                             |                      |
|                         |                                                                    |                      |         |
|                         | PRIMEDEX      HEALTH SYSTEMS, INC.                                      |                      |
|                         |                                                                    |                      |         |
|                         | By:                                                                | /s/      Howard G. Berger |         |
|                         | Name:       Howard      G. Berger, M.D.                            |                      |
|                         | Title:       President                                             |                      |
|                         |                                                                    |                      |         |
|                         | BEVERLY      RADIOLOGY MEDICAL GROUPIII                                 |
|                         |                                                                    |                      |
|                         | By:      ProNet Imaging Medical Group, Inc., itsgeneral      partner    |                      |
|                         |                                                                    |                      |         |
|                         | By:                                                                | /s/      Howard G. Berger |         |
|                         | Name:       Howard      G. Berger, M.D.                            |                      |
|                         | Title:       President                                             |                      |
|                         |                                                                    |                      |         |
|                         | By:      Beverly Radiology Medical Group, Inc., itsgeneral      partner |                      |
|                         |                                                                    |                      |         |
|                         | By:                                                                | /s/      Howard G. Berger |    |
|                         | Name:       Howard      G. Berger, M.D.                            |                      |
|                         | Title:       President                                             |                      |
|                         |                                                                    |                      |         |
|                         | PRONET      IMAGING MEDICAL GROUP, INC.                                 |
|                         |                                                                    |                      |         |
|                         | By:                                                                | /s/      Howard G. Berger |    |
|                         | Name:       Howard      G. Berger, M.D.                            |                      |
|                         | Title:       President                                             |                      |

----

|   | BEVERLY      RADIOLOGY MEDICAL GROUP,INC.         |
|--------|---------------------------------------------------|
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | RADNET      SUB, INC.                             |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | SO      CAL MR SITE MANAGEMENT, INC.              |   |
|   |                                              |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | RADNET      MANAGEMENT I, INC.                    |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | RADNET      MANAGEMENT II, INC.                   |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |

----

|   | RADNET      MANAGED IMAGINGSERVICES,      INC.    |                      |
|--------|---------------------------------------------------|---------------------------|
|   |                                              |                      |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |                      |
|   | Title:       President                       |                      |
|   |                                              |                      |   |
|   | DIAGNOSTIC      IMAGING SERVICES, INC.            |                      |
|   |                                              |                      |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |                      |
|   | Title:       Chief Financial      Officer    |                      |
|   |                                              |                      |   |
|   | RADIOLOGIX,      INC.                             |                      |
|   |                                              |                      |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |                      |
|   | Title:       President                       |                      |
|   |                                              |                      |   |
|   | ADVANCED      IMAGING PARTNERS, INC.              |                      |
|   |                                              |                      |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |                      |
|   | Title:       President                       |                      |
|   |                                              |                      |   |
|   | IDE      IMAGING PARTNERS, INC.                   |                      |
|   |                                              |                      |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |                      |
|   | Title:       President                       |                      |

----

|   | MID      ROCKLAND IMAGING PARTNERS,INC.           |
|--------|---------------------------------------------------|
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | PACIFIC      IMAGING PARTNERS, INC.               |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | QUESTAR      IMAGING, INC.                        |   |
|   |                                              |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | TREASURE      COAST IMAGING PARTNERS,INC.         |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | COMMUNITY      IMAGING PARTNERS, INC.             |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |

----

|   | RADIOLOGY      AND NUCLEAR MEDICINEIMAGING      PARTNERS, INC. |                      |
|--------|----------------------------------------------------------------|---------------------------|
|   |                                                           |                      |   |
|   | By:                                                       | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D.              |                      |
|   | Title:       President                                    |                      |
|   |                                                           |                      |   |
|   | VALLEY      IMAGING PARTNERS, INC.                             |                      |
|   |                                                           |                      |   |
|   | By:                                                       | /s/      Howard G. Berger |    |
|   | Name:       Howard      G. Berger,      M.D.              |                      |
|   | Title:       President                                    |                      |
|   |                                                           |                      |   |
|   | QUESTAR      DULUTH, INC.                                      |                      |
|   |                                                           |                      |
|   | By:                                                       | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D.              |                      |
|   | Title:       President                                    |                      |
|   |                                                           |                      |   |
|   | QUESTAR      LOS ALAMITOS, INC.                                |                      |
|   |                                                           |                      |   |
|   | By:                                                       | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D.              |                      |
|   | Title:       President                                    |                      |
|   |                                                           |                      |   |
|   | QUESTAR      VICTORVILLE, INC.                                 |                      |
|   |                                                           |                      |   |
|   | By:                                                       | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D.              |                      |
|   | Title:       President                                    |                      |

----

|   | ROCKY      MOUNTAIN OPENSCAN MRI, LLC             |
|--------|---------------------------------------------------|
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |
|   |                                              |   |   |
|   | FRI,      INC.                                    |   |
|   |                                              |   |   |
|   | By:                                          | /s/      Howard G. Berger |   |
|   | Name:       Howard      G. Berger,      M.D. |   |
|   | Title:       President                       |   |

----

| GENERAL      ELECTRIC CAPITALCORPORATION, |                                          |
|-------------------------------------------|-----------------------------------------------|
| as      Agent and a Lender                |                                          |
|                                      |                                          |
| By:                                       | /s/      GENERAL ELECTRIC CAPITAL CORPORATION |   |
|                                      | Duly      Authorized Signatory                |   |

----

| [INSERT NAME OF      LENDER], as a      Lender |         |
|------------------------------------------------|--------------|
|                                           |         |
| By:                                            |    |   |
| Name:                                          |         |   |
| Title:                                         |    |   |

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