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 Quarterly Report of RadNet, Inc. (the "Company") on Form
10-Q for the quarterly period ended September 30, 2008, as filed with the
Securities and Exchange Commission on November 10, 2008 (the "Report"), I, Mark
D. Stolper, Chief Financial Officer of the Company, certify, pursuant to 18
U.S.C. Section 1350, as adopted 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)
                                             November 10, 2008

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.