One thing I would add to this, perhaps not totally pertinent. But I have had prostate MRIs (12-15) done at both UCLA and Mayo Clinic. This was when Tesla three machines were very hard (actually impossible) to find where I live. One thing that both UCLA and Mayo Clinic emphasize with their MRIs was that my small intestine/bowel area would not be moving during their MRI imaging. Mayo accomplishes this by giving you an injection that sort of paralyzes your bowels for a while so that the MRI can happen. UCLA does this by prescribing a light diet the day before. An enema the evening before the MRI and an enema the morning of the MRI with an empty stomach so that your bowels aren’t moving. And my thought would be that there’s all this emphasis on what food in the system does with regard to your bowels, moving and changing position of the prostate, wouldn’t it also apply during the radiation? That is why I did not eat anything until after the radiation session.