PROBLEM TO BE SOLVED: To provide a particle beam therapy device that realizes highly-accurate positioning of a rotary gantry.SOLUTION: A particle beam therapy device 10 comprises: a body barrel 15 that is provided with an emission unit 13 for emitting a particle beam 12 in a therapy space 11 and is provided with a beam transport system 14 for guiding the particle beam 12 to the emission unit 13 a drive roller 17 that supports the body barrel 15 on an upstream side of entry of the particle beam 12 and rotates the body barrel 15 through rotary drive of a motor 27 a driven roller 18 that supports the body barrel 15 on a side of the therapy space 11 and rotates in accordance with the movement of the body barrel 15 an angle detection sensor 22 that detects a rotation angle of the driven roller 18 a first angle detection unit 24 that obtains a rotation angle of the body barrel 15 corresponding to the detected rotation angle of the driven roller 18 and a driving quantity calculation unit 25 that calculates a driving quantity of the motor 27 on the basis of the obtained rotation angle of the body barrel 15, so as to direct the emission unit 13 at a prescribed emission angle.COPYRIGHT: (C)2015,JPO&INPIT【課題】回転ガントリーの高精度な位置決めを可能とする粒子線治療装置を提供する。【解決手段】粒子線治療装置10は、治療スペース11で粒子線ビーム12を照射する照射部13と粒子線ビーム12を照射部13に案内するビーム輸送系14とが設けられた本体胴15と、粒子線ビーム12が入射する上流側で本体胴15を支持して、モータ27の回転駆動により本体胴15を回転させる駆動ローラ17と、治療スペース11側で本体胴15を支持して、本体胴15に従動して回転する従動ローラ18と、従動ローラ18の回転角度を検知する角度検知センサ22と、検知された従動ローラ18の回転角度に対応する本体胴15の回転角度を求める第一角度検出部24と、照射部13を指定された照射角度に移動させるために、求めた本体胴15の回転角度に基づいてモータ27の駆動量を計算する駆動量計算部25と、を備える。【選択図】 図1
