Patent ID: 6265837
Filing Date: 2001-07-24
Classification: A61N,G21K

Abstract:
A charged-particle beam irradiation method in which while a charged-particle beam ejected from an accelerator is scanned by an electromagnet, each layer resulting from the division of an affected part into a plurality of layers in the direction of progression of said charged-particle beam is irradiated with the charged-particle beam,wherein the intensity of a charged-particle beam for irradiation of a first layer is made lower than the intensity of a charged-particle beam for irradiation of a second layer existing at a position deeper than said first layer in the beam progressing direction, and a scanning speed in said first layer is changed between a portion of said first layer subjected to irradiation at the time of irradiation of said second layer and a portion of said first layer subjected to no irradiation at the time of irradiation of said second layer.