Home > Cancer > MRI Helping Guide Cancer Therapy. Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on May 18, 2008 by NinaMayr, Views: 3279 MRI can be a useful tool to help guide thrapy for cancer treatment. If the MRI shows more blood supply to the tumor, it shows doctors that the tumor may be more receptive to treatment with chemotherapy. Dr. Nina Mayr. Ohio State Univ.