Patent ID: 7947969

Claim:
A stacked conformation radiotherapy system comprising an accelerator which accelerates a particle beam generated from an ion source, an irradiation head which projects the particle beam accelerated by said accelerator, toward an object to-be-irradiated, and which includes wobbler electromagnets for deflecting and scanning the particle beam, and an irradiation controller for carrying out stacked conformation radiotherapy by controlling the ion source, said accelerator and said irradiation head, said irradiation controller deflecting and scanning the particle beam by subjecting the wobbler electromagnets to magnetization controls; wherein said irradiation controller performs the magnetization controls of the wobbler electromagnets so that the particle beam depicts a one-stroke revolving orbit which begins with a start point and returns to the start point, controls an irradiation dose of the stacked conformation radiotherapy in a depth direction of the object to be irradiated by altering a particle beam intensity layer by layer, and sets a total emission period of the particle beam to be outputted from said accelerator, prior to irradiation, such that the total emission period in each layer is an integral multiple of a wobbler cycle which is required for the particle beam to make one revolution of the revolving orbit.