- This study is separated into 2 phases. In phase 1, patients will be asked to have their bladder full for the second planned insertion of the brachytherapy applicator and empty for the third insertion. For phase 2, the effect of cylinder angle on normal tissue dosimetry will be investigated. Of the two bladder states assessed in phase 1 (empty or full), the one deemed to give the lower dose to the total amount of bladder tissue will be considered the standard and applied to all patients in phase 2.