For pelvic radiation therapy, patient preparation focuses on bladder and rectal filling/emptying to optimize organ separation from the prostate.

“so not not so much for pelvic patients but we do that for breast cancer especially left-sided breasts so just to go back to that uh you actually have a deep breath hold which will get the chest wall away from the heart so we do that in the case of thoracic tumors but in the pelvis that the diaphragmatic position doesn't really make any difference it's more about bladder and rectal filling and emptying respectively that's much more important”