PROBLEM TO BE SOLVED: To improve accuracy of dose calibration in lamination irradiation by performing the dose calibration in the lamination irradiation by each layer.SOLUTION: A dose calibration method for a particle beam treatment apparatus radiates a particle beam to a prescribed area of a target volume which is divided into a plurality of layers in a particle beam advance direction. The particle beam treatment apparatus includes: a particle beam irradiation unit 105 having a dose monitor for monitoring the dose of the particle beam as a count value to form an irradiation field within the prescribed area and a treatment control unit 102 for controlling the operation of the particle beam irradiation unit. The dose calibration method includes the step of obtaining calibration coefficients &alphai for the plurality of layers by dividing the physical dose in radiating the particle beam to each of the plurality of layers by the count value.COPYRIGHT: (C)2011,JPO&INPIT【課題】積層照射における線量校正を各層事に行え、積層照射時における線量校正の精度を向上する。【解決手段】標的体積の所定領域を粒子線の進行方向に複数の層に分割して粒子線を照射する粒子線治療装置の線量校正方法であって、粒子線治療装置は、粒子線の線量をカウント値としてモニタする線量モニタを有し、所定領域内に照射野を形成する粒子線照射部105と、粒子線照射部の動作を制御する治療制御部102とを備え、線量校正方法は、複数の層のうち各層に粒子線を照射したときの物理線量をカウント値で除して各層ごとに校正係数αiを求めるステップを有する。【選択図】図1
