title: Estimation of a radiation time prolongation factor for intensity-modulated radiotherapy.
abstract: In general, the deposition of a given target dose requires a longer radiation time for intensity-modulated photon beams (IMBs) than for unmodulated beams. Hence, the routine use of intensity-modulated radiotherapy (IMRT) has repercussions both on the exposure of the patient to scatter and institutional radiation safety. A rule of thumb is presented to assess the maximum prolongation of radiation time for a case class in an idealized setting using static superimposed field segments. The method considers only the degree to which risk structures have to be blocked to meet specified dose restrictions.
authors.affiliation: Abteilung für Medizinische Physik, Universitatsklinik für Radioonkologie, Hoppe-Seyler-Str 3, 72076 Tübingen, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Bakai
authors.forename: M
authors.initials: M
authors.lastname: Alber
authors.forename: F
authors.initials: F
authors.lastname: Nüsslin
mesh_terms: D000465:Algorithms; D006258:Head and Neck Neoplasms / Q000532:radiotherapy; D006801:Humans; D008297:Male; D011471:Prostatic Neoplasms / Q000532:radiotherapy; D011786:Quality Control; D011874:Radiometry / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D020266:Radiotherapy, Conformal / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity