**Exhibit21.1**
| **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                  |
| Diagnostic Solutions Corp.                        |       | Delaware                  |
| Dublin Diagnostic Imaging, LLC                    |       | Ohio                      |
| East Bay Medical Imaging, LLC                     |       | California                |
| Encinitas Imaging Center, LLC                     |       | California                |
| Garfield Imaging Center, Ltd.                     |       | 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                |
| Western New York Imaging 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                |
| Signal Medical Services, Inc.                     |       | Delaware                  |
| St. John’s Regional Imaging Center, LLC      |       | California                |
| Syncor Diagnostics Bakersfield, LLC               |       | California                |
| Syncor Diagnostics Sacramento, LLC                |       | California                |
| TME Arizona, Inc                                  |       | Texas                     |
| Valencia MRI, LLC                                 |       | California                |
| Wilkes-Barre Imaging, LLC                         |       | Pennsylvania              |
| Woodbridge MRI                                    |       | Texas                     |

 

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