**Exhibit21.1**

**September21, 2007**
| **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-Fairfax, Inc.   |       | Delaware                  |
| Comprehensive OPEN MRI-Carmichael/Folsom, LLC |       | California                |
| Dublin Diagnostic Imaging, LLC                |       | Ohio                      |
| Encinitas Imaging Center, LLC                 |       | California                |
| East Bay Medical Imaging, LLC                 |       | California                |
| Garfield Imaging Center, Ltd.                 |       | California                |
| InSight Health Corp.                          |       | Delaware                  |
| InSight Health 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                   |
| 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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