PROBLEM TO BE SOLVED: To further expand the range where a radiation ray can be irradiated in a radiotherapy apparatus.SOLUTION: As a therapeutic plan for a radiotherapy apparatus provided with a patient support movable at least in a longitudinal direction, a radiation irradiation device for irradiating a radiation ray, a swinging mechanism for supporting the radiation irradiation device so as to change the direction, and a rotation mechanism for supporting the swinging mechanism so as to rotate around an axis in a longitudinal direction of the patient support, a therapeutic planning device generates a therapeutic plan having a time zone in which a time zone when the patient support moves, a time zone when the radiation irradiation device irradiates the radiation ray, a time zone when the rotation mechanism rotates the swinging mechanism, and a time zone when the swinging mechanism changes the direction of the radiation irradiation device are overlapped.COPYRIGHT: (C)2015,JPO&INPIT【課題】放射線治療装置において放射線を照射可能な範囲をより広げられるようにする。【解決手段】治療計画装置が、少なくとも長手方向に移動可能な患者支持体と、放射線を照射する放射線照射装置と、前記放射線照射装置を向き変更可能に支持する首振り機構と、前記患者支持体の長手方向の軸の周りを回転可能に前記首振り機構を支持する回転機構と、を備える放射線治療装置の治療計画として、前記患者支持体が移動する時間帯と、前記放射線照射装置が前記放射線を照射する時間帯と、前記回転機構が前記首振り機構を回転させる時間帯と、前記首振り機構が前記放射線照射装置の向きを変更する時間帯とが重なる時間帯を有する治療計画を生成する。【選択図】図3
