PROBLEM TO BE SOLVED: To provide a particle beam therapy apparatus narrowing the range of a site of malfunction causing abnormality of a leaf within the apparatus when the abnormality of the leaf is detected.SOLUTION: The particle beam therapy apparatus includes: a leaf abnormality detecting part 12 for detecting occurrence of abnormality of a leaf position based on a drive control signal SD and a leaf position signal SP a simulated signal output part 43 for generating a simulated signal SS suggesting that the leaf position is normal and a signal switching part 42 for switching the signal output to a prescribed part either to the simulated signal SS or to the leaf position signal SP. When the leaf abnormality detecting part 12 detects the abnormality of the leaf position, the signal output to the prescribed part is switched to the simulated signal SS, and the leaf abnormality detecting part 12 is made to re-detect the presence of abnormality of the leaf position. The particle beam therapy apparatus also includes a malfunction range diagnosing part 13 for diagnosing the range of the malfunction site which may cause the abnormality of the leaf position based on the result of detection of whether abnormality is detected or not in the re-detection and the position in the input/output of signals within the apparatus.COPYRIGHT: (C)2011,JPO&INPIT【課題】リーフの異常を検出した際に、リーフ異常の原因となった故障個所が装置内のどの範囲にあるかを絞り込める粒子線治療装置を得ることを目的とする。【解決手段】駆動制御信号SDとリーフ位置信号SPに基づいて、リーフ位置の異常の有無を検出するリーフ異常検出部12と、リーフ位置が正常であることを示す模擬信号SSを生成する模擬信号出力部43と、所定部分に出力される信号を模擬信号SSまたはリーフ位置信号SPのいずれかに切替える信号切替部42とを有し、リーフ異常検出部12がリーフ位置の異常を検出したときに、所定部分に出力する信号を模擬信号SSに切替えてリーフ異常検出部12にリーフ位置の異常の有無を再検出させ、再検出時に異常を検出するか否かの結果と所定部分の当該装置内での信号入出力における位置とに基づいて、リーフ位置の異常の原因となりうる故障部位の範囲を診断する故障範囲診断部13を備えるように構成した。【選択図】図1
