PROBLEM TO BE SOLVED: To provide a particle beam therapy system that can secure the accuracy of a magnetic field of an electromagnet, can complete initialization operation with a small number of pattern operations, and can also achieve both improvement in operation rate and securement of magnetic field accuracy.SOLUTION: A particle beam therapy system according to the invention comprises: an accelerator 400 that accelerates a charged particle beam a transport device 510 that guides the accelerated charged particle beam to an emission point an electromagnet that constitutes at least one of the accelerator 400 and the transport device 510 a power supply 930 that outputs a current to the electromagnet a controller 920 that controls the power supply before emission of the charged particle beam to the emission point so as to initialize the electromagnet by outputting a current having a designated pattern magnetic field measuring means 460 that measures a magnetic field excited by the electromagnet current measuring means 470 that measures the output current of the power supply and a measurement data processor 800 that determines whether or not values of the magnetic field and the current which are measured during the initialization satisfy predefined conditions. The controller 920 finishes the initialization on the basis of a determination result from the measurement data processor.COPYRIGHT: (C)2016,JPO&INPIT【課題】電磁石の磁場の精度を確保するとともに少ないパターン運転回数で初期化運転を完了でき、稼働率向上と磁場精度の確保を両立できる粒子線治療システムを提供することにある。【解決手段】本発明は、荷電粒子ビームを加速する加速器400と、加速された荷電粒子ビームを照射点まで導く輸送装置510と、加速器400及び輸送装置510のうち少なくともいずれか一方を構成する電磁石と、電磁石に電流を出力する電源装置930と、荷電粒子ビームの照射点への照射前に、指定されたパターンの電流を出力して電磁石を初期化するように電源装置を制御する制御装置920と、電磁石が励磁する磁場を測定する磁場測定手段460と電源装置の出力電流を測定する電流測定手段470と、初期化中に測定した磁場及び電流の値があらかじめ指定した条件を満たすか否かを判定する測定データ処理装置800を備え、制御装置920は、測定データ処理装置の判定結果に基づいて初期化を終了させることで、上記課題を解決する。【選択図】 図1
