Patent ID: 6617598
Filing Date: 2003-09-09
Classification: A61N,G21K,H05H

Abstract:
A charged particle beam irradiation apparatus comprising:a charged particle beam generation device including an accelerator; and an irradiation device for irradiating an irradiation target portion with a charged particle beam generated from the charged particle beam generation device; the irradiation device having a charged particle beam scanning device for scanning the charged particle beam and a Bragg peak enlarging device for increasing a width in a depth direction of a Bragg peak formed by the charged particle beam scanned by the charged particle beam scanning device, the Bragg peak enlarging device having a first filter member and a second filter member which are disposed in order in an advancing direction of the charged particle beam and each of which has at least one thick-walled portion in a direction intersecting the advancing direction, the first filter member and the second filter member being disposed with their respective thick-walled portions intersecting mutually in the advancing direction of the charged particle beam.