Hitachi, Ltd.

Hokkaido University

Yuichi Hirata

Naoki Miyamoto

Taeko Matsuura

Kikuo Umegaki

Taisuke Takayanagi

Shinichi Shimizu

Seishin Takao

Yusuke Vincent Fujii

Masahiro Yoshida

Toru Umekawa

Hiroki Shirato

Shinichiro Fujitaka

Hideaki Nihongi

Chihiro Nakashima

Tomoki Murata

Sodai Tanaka

Chie Toramatsu

A treatment planning system that generates treatment planning for irradiating a target with a particle beam, includes an arithmetic processing device that sets at least two or more irradiation patterns for one treatment planning, calculates a plurality of predicted dose distributions for each irradiation pattern based on a target dose set for each region for at least one region including a region of the target, and calculates an index for evaluating validity of the irradiation pattern based on the plurality of predicted dose distributions.

Treatment planning system, treatment planning generation method, and recording medium

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

A radiotherapy control apparatus includes a fluoroscopic image acquisition unit to acquire fluoroscopic images of markers in a patient from a single fluoroscopic imaging device, a projection line calculation unit to identify projected positions of the markers on the fluoroscopic image and calculate equations of projection lines linking these projected positions and a focus position of the imaging device, an inter-marker distance acquisition unit to acquire a distance between each pair of the markers, a marker position calculation unit to calculate current positions of the markers based on the equations and the distances, and a therapeutic radiation emission determination unit to determine whether to emit therapeutic radiation based on the current positions of the markers.

Radiotherapy control apparatus and radiotherapy control program

Growing community of inventors

Sapporo, Japan

Yuichi Hirata