CHARGED PARTICLE BEAM IRRADIATION APPARATUS

• US 20100288946A1
• Filed: 05/12/2008
• Published: 11/18/2010
• Est. Priority Date: 05/12/2008
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Harada, Hisashi, Pu, Yuehu, Honda, Taizo
• Granted Patent: US 8,304,751 B2
• Time in Patent Office: Days
• US Class Current: 250/492.3
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 2005/1095 Elements inserted into the radiation path within the system, e.g. filters or wedges
• CPC Class Codes: A61N 5/10 X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy A61N5/01 takes precedence

Abstract

In a charged particle beam irradiation apparatus to be adapted to a particle beam cancer treatment system or the like, a desired depth dose distribution is highly precisely created. In the charged particle beam irradiation apparatus that irradiates a particle beam, which is radiated from a particle beam generation unit, to a subject to be irradiated via a ridge filter exhibiting a cyclic thickness distribution for causing the particle beam to exhibit a desired energy distribution, the ridge filter has plural ridges thereof arranged to be perpendicular to entering directions of the particle beam.

Claims

1. A charged particle beam irradiation apparatus that irradiates a particle beam, which is radiated from a particle beam generation unit, to a subject to be irradiated via a ridge filter exhibiting a cyclic thickness distribution for causing the particle beam to exhibit a desired energy distribution, wherein:

the ridge filter has the bottoms of respective ridges thereof arranged at different angles.

2. The charged particle beam irradiation apparatus according to claim 1, wherein the ridge filter has the bottoms of the respective ridges arranged to be most exactly perpendicular to mean incident particle beam directions.

3. The charged particle beam irradiation apparatus according to claim 1, wherein the ridge filter has the respective ridges thereof arranged at different angles and positions.

4. The charged particle beam irradiation apparatus according to claim 1, wherein the ridge filter has the arrangement spacing for each ridge modulated in a direction, in which a cyclic depth distribution is created, according to a change in the angle of each ridge.

5. The charged particle beam irradiation apparatus according to claim 1, wherein the ridge filter includes plural bar ridges, and the shape of each bar ridge is varied depending on a distance from the center of a radiation field in the long-side direction of the ridge filter.

6. The charged particle beam irradiation apparatus according to claim 1, wherein a plurality of ridge filters are prepared in association with different conditions for radiation-field formation, and selectively disposed on a beam path, along which the particle beam passes, according to a desired condition for radiation-field formation.