title: Early breast cancer irradiation after conservative surgery: quality control by portal localization films.
abstract: A review of geometrical errors on portal localization films in 20 patients undergoing breast irradiation after conservative surgery is presented. Patients were immobilized using a cellulose acetate individual cast. Good precision in daily set-up has been noted with a mean ventrodorsal shift of 2.7 mm on medial films and 3.0 mm on lateral films; a mean craniocaudal shift of 1.8 mm on medial films and of 2.0 mm on lateral films have been also observed. The mean half-beam block rotation error has been minimal, ranging 0.8 degrees on medial and 1.1 degrees on lateral films. A new cast was made in 3/20 (15%) patients depending on variation of breast morphology during treatment and on geometrical errors noted by portal localization film check.
authors.affiliation: Department of Radiation Oncology, Clinica S. Pio X, Milano, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Valdagni
authors.forename: C
authors.initials: C
authors.lastname: Italia
mesh_terms: D001943:Breast Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery; D005260:Female; D006801:Humans; D015412:Mastectomy, Segmental; D009367:Neoplasm Staging; D011182:Postoperative Care; D011785:Quality Assurance, Health Care; D011859:Radiography