What instructions do you give patients to optimize bladder filling and rectal emptying for GU and GYN simulation and treatment?  

For prostate cancer treatment with external beam, IGRT is standard, so pretreatment localization of the target takes place.  Because of IGRT, I don't recommend rectal filling/emptying instructions.  To reduce bladder exposure, simulation and treatment with a "comfortably full bladder" is r...