PROBLEM TO BE SOLVED: To provide a particle radiation therapeutic apparatus capable of easily monitoring the interference of a particle ray irradiation part or a driven part such as a treatment bed.SOLUTION: The particle radiation therapeutic apparatus includes: the particle ray irradiation part 2 to be rotationally driven together with a rotary gantry 1 for irradiating an affected part of a patient 7 with particle rays the treatment bed 3 on which the patient 7 is mounted and which is driven so that the lesion of the patient 7 coincides with an isocenter 6 for particle rays irradiated by the particle ray irradiation part 2 a first sphere model creating means for creating a first sphere model 9 to cover the particle ray irradiation part 2 with a single or a plurality of spheres a second sphere model creating means for creating a second sphere model to cover the treatment bed with a single or a plurality of spheres and a sphere model interference monitoring means for monitoring the interference of the first and second sphere models.COPYRIGHT: (C)2010,JPO&INPIT【課題】粒子線照射部や治療用ベッドなどの被駆動部の干渉を容易に監視できる粒子線治療装置を提供する。【解決手段】回転ガントリ1と共に回転駆動され、患者7の患部に粒子線を照射する粒子線照射部2と、患者7を搭載し、患者7の病巣が粒子線照射部2照射される粒子線のアイソセンタ6に合致するように駆動される治療用ベッド3と、単一または複数の球によって粒子線照射部2を覆い包む第一の球モデル9を生成する第一の球モデル生成手段と、単一または複数の球によって治療用ベッドを覆い包む第二の球モデルを生成する第二の球モデル生成手段と、第一の球モデルと第二の球モデルの干渉を監視する球モデル干渉監視手段とを備える。【選択図】図3
