title: A technique for field matching in primary breast irradiation.
abstract: The intrinsic divergence of photon beams presents serious matching problems in three-field treatment of the breast and the adjoining supraclavicular area. A method is presented in which appropriate beam blocking combined with suitable isocentric rotation of the treatment couch neutralize the affects of divergence so that proper matching is achieved at all depths. The geometric principles and the set-up procedures are discussed and illustrated.
mesh_terms: D001943:Breast Neoplasms / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D008722:Methods; D011879:Radiotherapy Dosage; D014962:X-Ray Film