@caryg1955 i had the MRIdian linac machine. Unlike other radiation machines, except the Elekta, it has a built in MRI so you are treated with real time imaging, instead of fused images which is the case with proton and other types of radiation machines. The MRIdian allowed margins around the prostate to be 2 mm instead of 3-5 mm (used by most other radiation machines) so healthy tissue had less exposure. My side effects were minimal with temporary urine restriction. The machine had auto shutoff and real time dynamic mapping. The mirage randomized trial showed that the built in mri was significantly more effective than non built in mri radiation machines.