title: Fewer segments for IMRT generated by modulation splitting.
abstract: For intensity-modulated radiation therapy (IMRT), a simple technique is described which splits any N x N matrix I of fluences into two mathematically equivalent matrices IA and IB summing to 21, each of which requires considerably fewer segments to deliver IMRT using the jaws-plus-mask technique (Webb 2002b). When IA and IB are delivered alternately at fractions throughout the treatment, the total number of field segments required is between 1/2 and 2/3 that of delivering matrix I when unadjusted.
mesh_terms: D000465:Algorithms; D019583:Dose Fractionation, Radiation; D008962:Models, Theoretical; D011786:Quality Control; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation* / Q000379:methods*; D020266:Radiotherapy, Conformal / Q000295:instrumentation* / Q000379:methods*; D012680:Sensitivity and Specificity