Hitachi, Ltd.

Hitachi High-tech Corporation

Hokkaido University

Chihiro Nakashima

Taisuke Takayanagi

Kikuo Umegaki

Koji Matsuda

Taeko Matsuura

Shinichiro Fujitaka

Tomokazu Shimakura

Takeshi Fujita

Naoki Miyamoto

Taizo Honda

Hiroki Shirato

Shinichi Shimizu

Kazuo Tomida

Satoshi Totake

Tatsuya Fujisawa

Arao Nishimura

Ryosuke Shinagawa

Tomoki Murata

Yuichi Hirata

Rikiya Onimaru

A radiation therapy apparatus that enhances the reliability and ease of use of a treatment is provided. A radiation therapy apparatus includes: a treatment bed moving a top plate with an object to be treated placed on the top plate to a predetermined treatment location; an imaging apparatus moving to the predetermined treatment location from a direction different from the direction of movement of the top plate and picking up an image of the object to be treated; and an irradiation apparatus provided between the treatment bed and the imaging apparatus, extensible, and applying a radioactive ray to the object to be treated. When the CT apparatus moves to the treatment location, the irradiation apparatus moves to a predetermined waiting position. When applying a radioactive ray to an object to be treated, the irradiation apparatus moves to a predetermined irradiation position.

Radiation therapy apparatus and control method of radiation therapy apparatus

To provide a particle beam therapy device that expands an irradiation field while avoiding an increase in size of a scanning unit or an irradiation device including the scanning unit. A shift unitis provided downstream of a scanning unit. The shift unitdeflects a carbon beam as a particle beam to shift the irradiation field, thereby forming an expanded irradiation field. The shift unitincludes a first shift electromagnetthat shifts the irradiation field in a Y direction and a second shift electromagnetthat shifts the irradiation field in an X direction. The scanning unit is dynamically controlled, and the shift unitis statically controlled.

Particle beam therapy device and irradiation field forming method

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

The present invention provides a particle therapy system including an irradiation compensating device made up of an energy absorber, a first collimator, and a second collimator for use in a short-range region. The irradiation compensating device is characterized by a mechanism for attaching and detaching the first energy absorber, first collimator, and second collimator. The first collimator is located upstream where the beam diameter is small with a view to suppressing the width of the compensating device, thereby contributing to making the compensating device small and lightweight. The second collimator is located downstream to improve penumbrae.

Particle therapy system

A radiation measuring device having a plurality of sensors configured to generate charges in response to the radiation includes a signal processing device. The signal processing device uses an signal generated by a proton beam irradiation device upon changing of beam energy and causes accumulation values of charges output from the sensors to be separately stored in a main control device for each value of the energy. The main control device calculates depth dose profiles for values of the beam energy from the accumulation values stored in the main control device and representing the charges. The main control device calculates a range of the beam for each of the values of the beam energy from the depth dose profiles, corrects the depth dose profiles for the values of the beam energy using a correction coefficient that depends on the range and sums the corrected depth dose profiles.

Radiation measuring device, particle beam therapy device provided with radiation measuring device, and method for calculating dose profile of particle beam

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Tokyo, Japan

Chihiro Nakashima