PROBLEM TO BE SOLVED: To provide a system and a method for charged particle irradiation which is capable of shortening the irradiation time and shortening the treatment time by performing efficient irradiation even when irregular variation occurs in an object to be irradiated during gate irradiation.SOLUTION: Beam emission is stopped by regular emission permission end signal reception by regular movement signals. In the meantime, an emission possible state maintaining function 46b is activated by emission permission end signal reception. When set standby time elapses without receiving an emission permission start signal again during standby, the operation of the emission possible state maintaining function 46b ends. A charged particle beam generator 1 decelerates the beam. Sometimes the beam emission is stopped by irregular emission permission end signal reception during irradiation. In the meantime, the emission possible state maintaining function 46b is activated by the emission permission end signal reception, and the charged particle beam generator 1 maintains an emission possible state. When the emission permission start signal is received again during standby, the beam emission is restarted.COPYRIGHT: (C)2013,JPO&INPIT【課題】ゲート照射時に照射対象に不規則変動が生じたときも効率のよい照射を行うことで、照射時間を短縮し、治療時間を短縮できる荷電粒子照射システムおよび荷電粒子照射方法を提供する。【解決手段】規則的な移動信号による規則的な出射許可終了信号受信によりビームの出射が停止される。一方、出射許可終了信号受信により、出射可能状態維持機能46bが作動する。待機中に出射許可開始信号が再受信されず、設定待機時間を経過すると、出射可能状態維持機能46bは作動終了となる。荷電粒子ビーム発生装置1はビームを減速する。照射中の不規則的な出射許可終了信号受信によりビームの出射が停止される場合もある。一方、出射許可終了信号受信により、出射可能状態維持機能46bが作動し、荷電粒子ビーム発生装置1は出射可能状態を維持する。待機中に出射許可開始信号が再受信されると、ビームの出射が再開される。【選択図】図1
