gsd: I agree with @jeffmarc

I had the Mridian radiation machine with a built in mri so the margins around the cancer were 2 mm instead of 3-5 for most other non-built in mri machines. This meant less side effects and toxicity. I had 5 treatments in February of 2023. My Gleason was 3+4 and a 11.2 psa. I have had little or no side effects. The Elekta unity machine is another built in MRI machine.

Check out the Mirage randomized trial comparing side effects and toxicity between built in Mri and non-built in mri radiation machines.
https://www.urologytimes.com/view/mirage-trial-margin-reduction-with-mri-guided-sbrt-reduces-toxicity-vs-ct-guided-sbrt