Maverick 75: I finished my fifth and final treatment with the Mridian Viewray machine in February. My PSA was 10.2 with 3+4 tumors. I had considered Radiation and prostate removal. In terms of radiation, the margins used with the type of radiation are a big deal . The Mridian Viewray uses 2 mm margins based on a recent randomized trial. The wider, the margins, the more the healthy tissue is impacted. You will find that other forms of radiation use 4-6 mm. I looked at a great number of choices, and would make the same decision again.