PARTICLE IRRADIATION SYSTEM AND PARTICLE THERAPY SYSTEM

• US 20190329070A1
• Filed: 04/24/2019
• Published: 10/31/2019
• Est. Priority Date: 04/26/2018
• Status: Active Grant

• Current Assignee: Hitachi High -Tech Corporation (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: NAKASHIMA, Yuto, AOKI, Takamichi
• Granted Patent: US 10,625,098 B2
• Time in Patent Office: Days
• CPC Class Codes: A61N 2005/1087 Ions; Protons
• CPC Class Codes: A61N 5/1043 Scanning the radiation beam, e.g. spot scanning or raster scanning
• CPC Class Codes: A61N 5/1078 Fixed beam systems
• CPC Class Codes: H05H 13/04 Synchrotrons
• CPC Class Codes: H05H 2007/002 for modifying beam trajectory, e.g. gantries
• CPC Class Codes: H05H 2007/046 for beam deflection
• CPC Class Codes: H05H 7/04 Magnet systems , e.g. undulators, wigglers free-electron laser H01S3/0903; Energisation thereof
• CPC Class Codes: H05H 9/00 Linear accelerators

Abstract

A particle irradiation system includes three or more scanning magnets that scan a beam in a vertical direction (first direction) or a horizontal direction (second direction) perpendicular to each other. The three or more scanning magnets are configured such that the scanning magnets and the scanning magnets for scanning in the same direction between the vertical direction or the horizontal direction, are disposed in series on a progressing direction axis of a beam, and a volume of a magnetic field feeding region decreases as the scanning magnet is installed at a position farther from an isocenter on the progressing direction axis.

Claims

1. A particle irradiation system comprising three or more scanning magnets that scan a beam in a first direction or a second direction, which are perpendicular to each other,

wherein the three or more scanning magnets are configured such that at least two or more scanning magnets for scanning in an identical direction between the first direction and the second direction are disposed in series on a progressing direction axis of the beam, and that a volume of a magnetic field feeding region is smaller as the scanning magnet is installed at a position farther from an isocenter on the progressing direction axis.

2. The particle irradiation system according to claim 1, wherein

the three or more scanning magnets are configured such that sizes of an inter-pole gap and a pole width are constant in each of the scanning magnets.

3. The particle irradiation system according to claim 1, wherein

at least two or more of the three or more scanning magnets are configured such that sizes of an inter-pole gap and a pole width decrease as a distance from the isocenter increases on the progressing direction axis in each of the scanning magnets.

4. The particle irradiation system according to claim 3, wherein

some of the three or more scanning magnets is configured such that the sizes of the inter-pole gap and the pole width are constant in each of the scanning magnets.

5. The particle irradiation system according to claim 1, further comprising

power supplies that independently control each excitation amount of the three or more scanning magnets and are connected to the scanning magnets on a one-to-one basis.

7. A particle therapy system comprising the particle irradiation system according to claim 1.

6. A particle irradiation system comprising three or more scanning magnets that scan a beam in a first direction or a second direction, which are perpendicular to each other,

wherein, among the three or more scanning magnets, at least two or more scanning magnets for scanning in an identical direction between the first direction and the second direction are disposed in series on a progressing direction axis of the beam, and a cross-sectional area of a magnetic field feeding region in a plane vertical to the progressing direction axis decreases as a distance from an isocenter increases on the progressing direction axis.