title: An endocavitary rectal irradiation technique.
abstract: An alternative to standard short target-skin distance (TSD) rectal irradiation techniques is presented. The proctoscopic rectal cone is linked outside of the patient to a superficial X ray tube operated at 50 kVp and 25 mA. The cone is rigidly held in place by a hydraulic clamp and linked to the X ray tube with an electromagnetic lock. The X ray beam is filtered by 0.3 mm of aluminum, giving a half-value-layer of 0.27 mm of aluminum and an exposure rate of 720 R/min. (0.186 C/kg-min.) at the treatment TSD of 22 cm. The physical aspects of the technique are described in detail.
authors: Department of Radiation Oncology, Sir Mortimer B. Davis Jewish General Hospital, Montréal, Québec, Canada.
authors: E B
authors: EB
authors: Podgorsak
authors: M D
authors: MD
authors: Evans
mesh_terms: D001918:Brachytherapy / Q000379:methods*; D002277:Carcinoma / Q000532:radiotherapy*; D006801:Humans; D011351:Proctoscopy; D011878:Radiotherapy / Q000295:instrumentation; D012004:Rectal Neoplasms / Q000532:radiotherapy*; D014965:X-Rays