Patent ID: 8421031
Filing Date: 2013-04-16
Classification: A61N

Abstract:
1. A particle beam therapy system comprising: an accelerator that accelerates and emits a particle beam; an irradiation nozzle that has two electromagnets whose scanning directions are different from each other and that irradiates in a predetermined direction a particle beam emitted from the accelerator; an irradiation control unit that controls operation of the irradiation nozzle in such a way that a particle beam of a predetermined dose is sequentially irradiated onto each of a plurality of spots set in a planar direction in an irradiation subject; and a control unit that on/off-controls emission of a particle beam from the accelerator, wherein the irradiation control unit makes the irradiation nozzle scan the particle beam onto a predetermined area set in the planar-direction in the irradiation subject, so as to dilute a dose, in a predetermined period after a time point when emission of the particle beam is switched from ON to OFF, or in a period from the time point when emission of the particle beam is switched from ON to OFF to a time point when the particle beam is cut off.