When the IMRT technology for a radiation therapy system utilizing an X-ray or the like is applied as it is to a particle beam therapy system having a conventional wobbler system, there is posed the problem that it is required to utilize two or more boluses. The objective of the present invention is to solve the problem of excess irradiation in IMRT by a particle beam therapy system. More specifically, the problem of excess irradiation in IMRT by a particle beam therapy system is solved by raising the irradiation flexibility in the depth direction, without utilizing a bolus.There is provided a particle beam irradiation apparatus (58) having a scanning irradiation system (34) that performs scanning with a charged particle beam (1) accelerated by an accelerator and being mounted in a rotating gantry for rotating the irradiation direction of the charged particle beam (1) the particle beam irradiation apparatus (58) comprises a columnar-irradiation-field generation apparatus (4) that generates a columnar irradiation field by enlarging the Bragg peak of the charged particle beam (1).將X射線等放射線治療裝置使用的IMRT技術,直接應用於習知之具有搖擺機系統之粒子線治療裝置時,會有必須使用複數個組織補償物之問題。本發明係以解決在粒子線治療裝置中之IMRT的過度照射問題為其目的者。更具體言之,係不使用組織補償物而提高往深度方向之照射自由度,藉此來解決在粒子線治療裝置中之IMRT的過度照射問題。本發明係具備有使經加速器予以加速過之帶電粒子束(1)掃描之掃描照射系統(34),且搭載於使帶電粒子束(1)的照射方向旋轉之旋轉筒架之放射線照射裝置(58),放射線照射裝置(58)具備有使帶電粒子束(1)的布拉格峰擴大,以生成柱狀的照射野之柱狀照射野生成裝置(4)。1...帶電粒子束2...能量變更裝置3...深度方向照射野擴大裝置4、4a...柱狀照射野生成裝置10...X方向掃描電磁鐵11...Y方向掃描電磁鐵12a、12b...位置監測器13...劑量監測器32...掃描電磁鐵電源33...照射控制裝置34...掃描照射系統40...患部58...粒子線照射裝置
