I had 3+4 as well. 69 at the time. Did my research and ended up with the MRIdian from Viewray, a linac photon machine. I finished my treatments in mid February.2 mm margins so there is less healthy tissue exposed to radiation vs the 4-5 mm margins used by other radiation machines. The MRI is built into the machine so it is real time treatment not just fused images. Auto shut off if your organs or body moves during treatment. Minimal urination side effects in the beginning which Flomax solved.