Dependence of the safe rectum dose on the CTV-PTV margin size and treatment technique.

Background: Late rectal injury is a common side effect of external beam radiotherapy for prostate cancer.

Aim: The aim of this study was to evaluate what total dose may be safely delivered for prostate patients for 3DCRT and IMRT techniques and the CTV-PTV margin.

Materials And Methods: 3DCRT and IMRT plans were prepared for 12 patients.