PROBLEM TO BE SOLVED: To provide a particle beam therapy apparatus capable of accurately irradiating affected tissue with a particle beam by accurately making an irradiation field follow the movement of the affected part.SOLUTION: The particle beam therapy apparatus includes: an affected part displacement measuring device 9 for measuring the displacement of the affected part caused by the respiration a steering electromagnet 6 for deflecting the trajectory of the charged particle beam fed from an accelerator 1 an irradiation device 4 for processing the charged particle beam incoming via the steering electromagnet 6 in a prescribed irradiation shape and irradiating the affected part with the processed charged particle beam a beam position monitor 5 set between the steering electromagnet 6 and the irradiation device 4 for measuring the beam position of the charged particle beam incoming to the irradiation device 4 a steering electromagnet control part 10 having a feedback control function based on the measured beam position for controlling the excitation amount of the steering electromagnet 6 so that the trajectory of the charged particle beam is deflected according to the measured displacement of the affected part and an irradiation device position control part 4M for moving the irradiation device 4 according to the displacement of the affected part.COPYRIGHT: (C)2011,JPO&INPIT【課題】患部の移動に合わせて精度よく照射野を追従させ、患部組織に正確に粒子線ビームを照射できる粒子線治装置を得ることを目的とする。【解決手段】呼吸に伴う患部の変位を測定する患部変位測定装置9と、加速器1から供給された荷電粒子ビームの軌道を偏向させるステアリング電磁石6と、ステアリング電磁石6を経由して入射した荷電粒子ビームを所定の照射形状に加工して患部に照射する照射装置4と、ステアリング電磁石6と照射装置4との間に設置され、照射装置4に入射する荷電粒子ビームのビーム位置を測定するビーム位置モニタ5と、測定したビーム位置に基づくフィードバック制御機能を有し、測定した患部の変位に対応して荷電粒子ビームの軌道を偏向するように、ステアリング電磁石6の励磁量を制御するステアリング電磁石制御部10と、患部の変位に対応して照射装置4を移動させる照射装置位置制御部4Mと、を備える【選択図】図1
