The purpose of this study is to compare reproducibility of the device position and location of the prostate rectum interface between two immobilization devices for radiation therapy of prostate carcinoma.
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Inclusion Criteria: * 18 years of age or older * Clinically localized T1-3 N0-1 M0 adenocarcinoma of the prostate * Planned definitive radiation therapy Exclusion Criteria: * Prior proctectomy * Rectal surgery within one year * Proctitis * Rectal carcinoma * Anal Stenosis * History of inflammatory bowel disease * Scleroderma * Systemic sclerosis * Refusal of treatment with immobilization device