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Title:
SCANNING ELECTROMAGNET AND PARTICLE-BEAM RADIATION THERAPY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2021/020004
Kind Code:
A1
Abstract:
The purpose of the present invention is to achieve downsizing of a scanning electromagnet and simultaneously to minimize errors of the angle at which a charged particle beam is deflected. The present invention pertains to a scanning electromagnet for deflecting the trajectory of a charged particle beam. A winding wire U is provided to a groove SL1 and a groove SL4 both disposed opposite to each other. When the passing direction of a conductive wire constituting the winding wire U is defined as passing the groove SL1 in a γ-axis positive direction, the conductive wire constituting the winding wire U passes the groove SL4 in a γ-axis negative direction. In other words, the conductive wire constituting the winding wire U circles around a loop path SL1-SL2 that passes the groove SL1 in the γ-axis positive direction and passes the groove SL4 in the γ-axis negative direction. When electric current flows in the γ-axis positive direction through a winding wire section U+ disposed in the groove SL4, a winding wire section U- disposed in the groove SL4 has an electric current flowing in the γ-axis negative direction. A yoke 10, the winding wire U, a winding wire V, and a winding wire W form a structure with 120° rotational symmetry with respect to the central axis of the yoke 10.

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Inventors:
YAMADA TAKAHIRO (JP)
NOMURA TAKUYA (JP)
SOEDA SEIJI (JP)
Application Number:
PCT/JP2020/025639
Publication Date:
February 04, 2021
Filing Date:
June 30, 2020
Export Citation:
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Assignee:
HITACHI LTD (JP)
International Classes:
A61N5/10; G21K1/093
Foreign References:
JP2016083344A2016-05-19
JP2007260222A2007-10-11
JP2019034108A2019-03-07
JPH10300899A1998-11-13
JPH05264797A1993-10-12
US8378312B12013-02-19
Attorney, Agent or Firm:
YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)
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