title: Monte Carlo simulation of linac irradiation with dynamic wedges.
abstract: This study aims to simulate the dose distributions of LINAC with dynamic wedges (DWs) under various field sizes and wedge angles by the BEAMnrc code with DYNJAWS component module. These were compared with those calculated by the treatment planning system (TPS) and the measured data. All percentage depth doses (PDDs) were found to be in good agreement between TPS, Monte Carlo (MC) and measurements made in open fields and fields with DWs. For dose profiles, compared with the MC and the measurements, TPS gives reliable results for large field sizes (>10 × 10 cm(2)) but results in significant errors in small field sizes (5 × 5 cm(2)). The entrance surface doses calculated by TPS were found to be significantly overestimated. For depths deeper than 0.5 cm, TPS yields PDDs in agreement with MC simulations.
authors.affiliation: Department of Medical Imaging and Radiological Sciences and Institute of Radiological Sciences, Tzu Chi College of Technology, 880, Section 2, Chien-Kuo Road, Hualien 970, Taiwan kpchang@tccn.edu.tw chang.kwoping@gmail.com.
authors.forename: Kwo-Ping
authors.initials: KP
authors.lastname: Chang
authors.affiliation: Department of Radiology, Lotung Poh-Ai Hospital, 83, Nanchang Street, Luodong Township, Yilan County 265, Taiwan.
authors.forename: Lu-Yu
authors.initials: LY
authors.lastname: Chen
authors.affiliation: Department of Radiation Therapy, Mennonite Christian Hospital, 44, Min-chuan Road, Hualien 970, Taiwan.
authors.forename: Yu-Huang
authors.initials: YH
authors.lastname: Chien
mesh_terms: D006801:Humans; D009010:Monte Carlo Method; D010315:Particle Accelerators; D017785:Photons; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated; D012984:Software