PROBLEM TO BE SOLVED: To provide a charged particle beam irradiation device and a dose distribution calculation method of a charged particle beam that achieve accurate calculation of a dose distribution of the charged particle beam at an isocenter position.SOLUTION: A charged particle beam irradiation device 100 according to the invention irradiates an irradiated body at an isocenter position with a charged particle beam P, and comprises: an irradiation unit 1 that irradiates the irradiated body with the charged particle beam P a dose distribution monitor 6 that is provided at the irradiation unit 1 and measures a dose distribution of the charged particle beam and a dose distribution calculation unit 11 that calculates the dose distribution of the charged particle beam P at the isocenter position on the basis of a measured result by the dose distribution monitor 6. This charged particle irradiation device 100 makes it possible to calculate the dose distribution of the charged particle beam P at the isocenter position on the basis of the measured result of the dose distribution of the charged particle beam P passing through the irradiation unit 1.COPYRIGHT: (C)2015,JPO&INPIT【課題】アイソセンター位置における荷電粒子線の線量分布を精度良く算出することができる荷電粒子線照射装置及び荷電粒子線の線量分布算出方法を提供する。【解決手段】本発明は、アイソセンター位置の被照射体に対して荷電粒子線Pを照射する荷電粒子線照射装置100であって、被照射体に荷電粒子線Pを照射する照射部1と、照射部1に設けられ、照射部1に設けられ、荷電粒子線の線量分布を測定する線量分布モニタ6と、線量分布モニタ6の測定結果に基づいて、アイソセンター位置における荷電粒子線Pの線量分布を算出する線量分布算出部11と、を備える。この荷電粒子線照射装置100によれば、照射部1を通過する荷電粒子線Pの線量分布の測定結果に基づいて、アイソセンター位置における荷電粒子線Pの線量分布を算出することができる。【選択図】図2
