EXHIBIT 32.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Annual Report of RadNet, Inc. (the "Company") on
Form 10-K for the twelve month period ended December 31, 2008, as filed with the
Securities and Exchange Commission on March 16, 2009 (the "Report"), I, Mark D.
Stolper, Chief Financial Officer of the Company, certify, pursuant to Section
906 of the Sarbanes-Oxley Act of 2002, that:

      1. The Report fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934, as amended; and

      2. The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company as of, and for the periods presented in the Report.

                                               /s/ Mark D. Stolper
                                               ---------------------------------
                                                   Mark D. Stolper
                                                   Chief Financial Officer
                                                   (Principal Financial Officer)
                                                    March 16, 2009

A signed original of this written statement required by Section 906 has been
provided to the Company and will be furnished to the Securities and Exchange
Commission or its staff upon request.