| 摘要 |
A particle beam irradiation apparatus (50) radiates a particle beam (10) plural times per one irradiation position (12). A storage unit (3) stores a dose to be radiated each of the times (divisional target dose). A dose monitor (5) measures the dose of the particle beam (10) radiated to the irradiation position (12). At the first time of radiation, a controller (4) outputs an interruption signal (15) when the dose measured by the dose monitor (5) reaches the divisional target dose. The dose monitor (5) measures a dose (excessive dose) (14) radiated after the interruption signal (15) is outputted until the particle beam (10) is actually interrupted. Then, it is defined: Corrected Dose value = Divisional Target Dose - Excessive Dose Value. Instead, it may be defined: Corrected Dose value = Divisional Target Dose - Excessive Dose Estimation Value. At the second time of radiation, the controller (4) outputs an interruption signal (15) when the dose measured by the dose monitor (5) reaches the corrected dose value. According to this correction, in a spot scanning method, a dose radiated beyond a planned dose is reduced. |
