Particle therapy system

• US 7,060,997 B2
• Filed: 07/21/2005
• Issued: 06/13/2006
• Est. Priority Date: 03/26/2002
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hiramoto, Kazuo, Umezawa, Masumi, Norimine, Tetsuro
• Primary Examiner(s): Wells, Nikita
• Application Number:
  US11/185,717
• Publication Number:
  US 20050247890A1
• Time in Patent Office: 327 Days
• Field of Search: None
• US Class Current: 250/505.1
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1048 Monitoring, verifying, controlling systems and methods
• CPC Class Codes: A61N 5/1065 Beam adjustment
• CPC Class Codes: G21K 1/093 by magnetic means
• CPC Class Codes: G21K 5/04 with beam-forming means
• CPC Class Codes: H05H 7/04 Magnet systems , e.g. undulators, wigglers free-electron laser H01S3/0903; Energisation thereof

Abstract

A particle therapy system is provided which can simply and quickly correct a beam orbit. In a particle therapy system provided with an irradiation facility comprising a first beam transport system for receiving a beam and transporting the beam to the patient side, and an irradiation nozzle for forming an irradiation field of the beam, the particle therapy system comprises first beam position monitors for detecting a position upstream of the irradiation nozzle at which the beam passes, second beam position monitors for detecting a position downstream of the irradiation nozzle at which the charged-particle beam passes, and first and second steering magnets. Correction bending amounts for causing the beam to be coincident with a predetermined orbit after the correction are determined in accordance with detected results from the first and second beam position monitors, and first and second steering magnets are excited under control so that the determined correction bending amounts are obtained.

Claims

1. A charged-particle beam transport apparatus for transporting a charged-particle beam extracted from an accelerator which accelerates the charged-particle beam to a set level of energy, comprising:

first beam position detecting apparatus for detecting a position at which the charged-particle beam passes;

second beam position detecting apparatus arranged downstream of said first beam position detecting apparatus for detecting a position at which the charged-particle beam passes;

a first steering magnet and a second steering magnet both arranged upstream of said first beam position detecting apparatus;

displacement amount computing apparatus for determining respective 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 apparatus; and

control system for controlling respective excitation currents of said first and second steering magnets in accordance with said respective displacement amounts.