Hitachi, Ltd.

Hokkaido University

Dai Nippon Printing Co., Ltd.

Tomoki Murata

Satoshi Arai

Naoki Miyamoto

Kikuo Umegaki

Masato Okada

Hiroaki Furuichi

Osamu Chiba

Michihiro Ogura

Shigehiro Ueno

Taisuke Takayanagi

Hiroaki Segawa

Mikiko Hojo

Taeko Matsuura

Shinichiro Fujitaka

Fumiyasu Murakami

Masanori Sawada

Shinsuke Nagino

Chihiro Nakashima

Naonobu Yoshi

Kenichi Takizawa

Yuichi Hirata

Yoshinobu Omori

Jun-ichi Hirai

A ridge filterprovided in a particle therapy system includes a repeating structure bodyhaving a plurality of extending partsextending along the incident direction P of a proton beam, and a bottom plateprovided on the lower faceside opposite to the incident side of the proton beamof the repeating structure body. In addition, the repeating structure bodyand the bottom plateare integrally formed by a molding method, and each of the repeating structure bodyand the bottom plateis formed of a laminate of resin.

Resin laminate ridge filter for particle therapy system and manufacturing method thereof

There is provided a particle beam treatment system which has a simple mechanism and which is excellent in maintainability. Irradiation devicesandrespectively have a plurality of irradiation ports, andfor irradiating a target with a particle beam in a plurality of directions. In addition, an irradiation nozzle unitof the irradiation devicesandis movable between the plurality of irradiation ports, and. A fixed cover structureis disposed between the plurality of irradiation ports, andand the irradiation nozzle unit. In addition, the cover structurehas a slitfor allowing the irradiation nozzle unitto move therethrough.

Particle beam treatment system

A structure configuring a ridge filter has line symmetry about a line vertical to a depth direction passing the center of the structure. A small structure obtained in such a way that the structure is divided by this line has a bilaterally asymmetric shape about a center line in an iterative direction, and has a point symmetric shape about an intersection between the center line in the iterative direction and the center line in the depth direction. Thicknesses in the iterative direction of an uppermost stream surface and a lowermost stream surface in the depth direction are equal to each other. The structure is configured so that a thick portion in the iterative direction of the uppermost stream surface and the lowermost stream surface is not present in the depth direction.

Particle beam therapy system, ridge filter, and method of making ridge filter

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Tokyo, Japan

Tomoki Murata