Patent ID: 6774383
Filing Date: 2004-08-10
Classification: A61N,G21K,H05H

Abstract:
A particle therapy system comprising an accelerator for accelerating a charged-particle beam to a set level of energy, and a rotating irradiation facility for irradiating the charged-particle beam extracted from said accelerator, said irradiation facility comprising first beam transport appratus for transporting the charged-particle beam extracted from said accelerator, and irradiation field forming appratus for forming an irradiation field of the charged-particle beam transported by said first beam transport appratus, wherein said particle therapy system further comprises:first beam position detecting appratus arranged along an orbit of the charged-particle beam downstream of a most downstream one of magnets provided in said first beam transport appratus, and detecting a position at which the charged-particle beam passes; second beam position detecting appratus arranged along the orbit of the charged-particle beam downstream of said first beam position detecting appratus, and detecting a position at which the charged-particle beam passes; a first steering magnet and a second steering magnet both provided in said first beam transport appratus upstream of said first beam position detecting appratus; first displacement amount computing appratus for determining respective first displacement amounts, by which the position of the charged-particle beam is to be displaced by said first and second steering magnets, in accordance with detected signals outputted from said first and second beam position detecting appratus; and first cotrol system for controlling respective excitation currents of said first and second steering magnets in accordance with the respective first displacement amounts.