38 IMRT treatments. Was told bladder must be full & bowel empty or they would not continue. Therapists checked everytime. Drank 16 oz of water 30 minutes before procedure. Was good for about 1 hour so i am glad everthing was always on time.
PSA 0.4 before & 0.02 after IMRT. Still holding good.
Before any section (one hour) I was recommended to drink enough water (500ml) to fill my bladder. The intent was to “fix” the bladder and avoid movements. It also perfects the rounds (concave shape) so that rays can better avoid its walls. All in all, it will avoid risky radiation to the bladder.
There is a booklet in digital from the National Cancer Institute named “Radiation Therapy & You” with instructions on what to drink or eat, etc. Have a look in this site;
Hope it helps.