Patent ID: 7385203
Filing Date: 2008-06-10
Classification: A61N,H05H

Abstract:
1. A charged particle beam extraction system for extracting a charged particle beam toward an irradiation target, the system comprising: a charged particle beam generator for generating the charged particle beam; an irradiation apparatus including a wheel having a thickness varied in the direction of travel of the charged particle beam extracted from said charged particle beam generator such that energy of the charged particle beam passing said wheel is changed to form a spread-out Bragg peak width in said irradiation target, said irradiation apparatus irradiating the charged particle beam having passed said wheel toward said irradiation target; a first control unit for controlling start and stop of extraction of the charged particle beam from said charged particle beam generator in accordance with a rotational angle of said wheel; and a determination unit for determining whether the start and stop of extraction of the charged particle beam is controlled at a desired timing by said first control unit.