**Exhibit 21.1**

 
| **NAME  OF SUBSIDIARY**** **                      | ** ** | **STATE OF ORGANIZATION** | ** ** |
|--------------------------------------------------------|------------|---------------------------|------------|
|                                                   |       |                      |       |
| Asheville Mobile MRI Services, LLC                     |       | North Carolina            |       |
| Berwyn Magnetic Resonance Center, L.L.C.               |       | Illinois                  |       |
| Comprehensive Medical Imaging, Inc.               |       | Delaware                  |       |
| Comprehensive Medical Imaging Centers, Inc.       |       | Delaware                  |       |
| Comprehensive Medical Imaging-Bakersfield, Inc.   |       | Delaware                  |       |
| Comprehensive Medical Imaging-Biltmore, Inc.      |       | Delaware                  |       |
| Comprehensive Medical Imaging-Fairfax, Inc.       |       | Delaware                  |       |
| Comprehensive Medical Imaging-Fremont, Inc.       |       | Delaware                  |       |
| Comprehensive Medical Imaging-San Francisco, Inc. |       | Delaware                  |       |
| Comprehensive OPEN MRI-Carmichael/Folsom, LLC          |       | California                |       |
| Comprehensive OPEN MRI-East Mesa, Inc.            |       | Delaware                  |       |
| Comprehensive OPEN MRI-Garland, Inc                    |       | Delaware                  |       |
| Connecticut Lithotripsy, LLC                           |       | Connecticut               |       |
| Diagnostic Solutions Corp.                             |       | Delaware                  |       |
| Dublin Diagnostic Imaging, LLC                         |       | Ohio                      |       |
| Encinitas Imaging Center, LLC                          |       | California                |       |
| Garfield Imaging Center, Ltd.                          |       | California                |       |
| Granada Hills Open MRI, LLC                            |       | California                |       |
| IMI of Arlington, Inc.                            |       | Delaware                  |       |
| IMI of Kansas City, Inc.                          |       | Delaware                  |       |
| InSight Health Corp.                                   |       | Delaware                  |       |
| InSight Health Services Corp.                          |       | Delaware                  |       |
| InSight Imaging Services Corp.                         |       | Delaware                  |       |
| InSight-Premier Health, LLC                            |       | Maine                     |       |
| InSight ProScan, LLC                                   |       | Ohio                      |       |
| Jefferson MRI                                          |       | Texas                     |       |
| Jefferson MRI-Bala                                     |       | Texas                     |       |
| Kessler Imaging Associates, LLC                        |       | New Jersey                |       |
| Lockport MRI, LLC                                      |       | New York                  |       |
| Los Gatos Imaging Center                               |       | Texas                     |       |
| Maxum Health Corp.                                     |       | Delaware                  |       |
| Maxum Health Services Corp.                            |       | Delaware                  |       |
| Maxum Health Services of Dallas, Inc.             |       | Texas                     |       |
| Maxum Health Services of North Texas, Inc.        |       | Texas                     |       |
| Mesa MRI                                               |       | Texas                     |       |
| Mountain View MRI                                      |       | Texas                     |       |
| MRI Associates, L.P.                                   |       | Indiana                   |       |
| NDDC, Inc.                                        |       | Texas                     |       |
| Open MRI, Inc.                                    |       | Delaware                  |       |
| Orange County Regional PET Center-Irvine, LLC          |       | California                |       |
| Parkway Imaging Center, LLC                            |       | Nevada                    |       |
| Phoenix Regional PET Center-Thunderbird, LLC           |       | Arizona                   |       |
| Radiosurgery Centers, Inc.                        |       | Delaware                  |       |
| Rainbow Imaging, LLC                                   |       | New York                  |       |
| San Fernando Valley Regional PET Center, LLC           |       | California                |       |

 

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| Signal Medical Services, Inc.           |   | Delaware     |   |
|----------------------------------------------|--------|--------------|--------|
| St. John’s Regional Imaging Center, LLC |   | California   |   |
| Sun Coast Imaging Center, LLC                |   | Florida      |   |
| Syncor Diagnostics Bakersfield, LLC          |   | California   |   |
| Syncor Diagnostics Sacramento, LLC           |   | California   |   |
| TME Arizona, Inc                             |   | Texas        |   |
| Valencia MRI, LLC                            |   | California   |   |
| Wilkes-Barre Imaging, L.L.C.                 |   | Pennsylvania |   |
| Woodbridge MRI                               |   | Texas        |   |

 

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