Hitachi, Ltd.

Hokkaido University

Shinichiro Fujitaka

Taisuke Takayanagi

Hiroshi Akiyama

Kazuo Hiramoto

Kikuo Umegaki

Masumi Umezawa

Yoshihiko Nagamine

Chihiro Nakashima

Takurou Honda

Yusuke Vincent Fujii

Naoki Miyamoto

Koji Matsuda

Masahiro Yoshida

Toru Umekawa

Hiroki Shirato

Taeko Matsuura

Shinichi Shimizu

Takuya Nomura

Rintaro Fujimoto

Seishin Takao

Shusuke Hirayama

Rintarou Fujimoto

Yusuke Fujii

Yuichi Hirata

Tomoki Murata

There is provided a treatment planning system and a particle therapy system. In the related art, it is unable to determine optimum beam intensity in irradiation for which discrete spot irradiation and continuous beam irradiation coexist. There is provided a treatment planning system that includes a spot determination unit that divides an irradiation region to be irradiated with a charged particle beam into a plurality of layers in an advancing direction of the charged particle beam and disposes a plurality of irradiation spots, which becomes irradiation points of the charged particle beam, in the layers and a beam intensity determination unit that determines beam intensity for each of the layers by evaluating the irradiation time by changing the beam intensity in a range of a condition of change in dose distribution which is set in advance.

Treatment planning system and particle therapy system

Provided are a radiation treatment planning system and a radiation treatment system that are capable of achieving time shortening and labor saving of treatment planning making when a radiation treatment is planned. A predicted DVH calculation portionof an arithmetic processing devicein a radiation treatment planning systemanisotropically enlarges a target regionin an irradiated body image which is input to the radiation treatment planning system, and calculates an overlap volume OV with an organ-at-risk regionper the number of times of enlargement. A DVH (Dose Volume Histogram) is predicted from a volume of the calculated OV, and a dose histogram in the OV per the number of times of enlargement which is calculated from a past treatment planning data group, and is displayed on a display device

Radiation treatment planning system and radiation treatment system

The invention provides a particle therapy system in which whether to perform any one irradiation method of a raster scanning method and a discrete spot scanning method can also be selected based on previous selection depending on a target volumeof a patientto be irradiated, and either of the irradiation methods of the raster scanning method and the discrete spot scanning method is configured to be capable of being performed by one irradiation apparatus. Therefore, a small particle therapy system capable of achieving both higher accuracy irradiation and high dose rate improvement is provided.

Particle therapy system

A radiation therapy planning apparatus performs dose calculation at high speed and with high accuracy for radiation therapy in a scanning irradiation method. The apparatus includes a display, an arithmetic processing apparatus, a memory, and a data server, which is connected to a particle beam irradiation apparatus. A dose calculation unit of the arithmetic processing apparatus calculates dose distribution by a simplified Monte Carlo algorithm, and corrects the dose distribution by a decreasing rate stored in a particle number decreasing rate table of the memory, and stores the corrected dose distribution in an integrated dose distribution table. By using the simplified Monte Carlo algorithm and the particle number decreasing rate that corrects the simplified Monte Carlo algorithm, the dose distribution is calculated, and thereby, it is possible to realize a radiation therapy planning apparatus that performs dose calculation at a high speed with high accuracy.

Radiation therapy planning system, radiation therapy planning method, and radiation therapy 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

First ions and second ions that are heavier than first ions are generated in an ion source. One kind of ions of the first ions and second ions is injected into an accelerator by action of a switching magnet and accelerated in the accelerator. An ion beam including the one kind of ions is extracted from the accelerator to a beam transport system and a tumor volume of a patient is irradiated with the ion beam from an irradiation nozzle. In the irradiation of the ion beam, a tumor volume depth and the largest underwater range of each ion species are compared, and an ion species in which the tumor volume depth becomes the longest underwater range or lower is injected into the accelerator, and accelerated by the accelerator. The tumor volume is irradiated with the ion species.

Charged particle beam 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

A charged particle beam reduces treatment time in the uniform scanning or in the conformal layer stacking irradiation. In the uniform scanning, an optimum charged particle beam scan path for uniformly irradiating a collimator aperture area is calculated. In the conformal layer stacking irradiation, an optimum charged particle beam scan path for uniformly irradiating a multi-leaf collimator aperture area of each layer for each of the layers obtained by partitioning the target volume is calculated. Alternatively, a minimum irradiation field size that covers the multi-leaf collimator aperture area of each layer is calculated, and a scan path corresponding to the irradiation field size, prestored in a memory of a particle therapy control apparatus, is selected. The charged particle beam scan path is optimally changed in the lateral directions in conformity with the collimator aperture area in the uniform scanning or in each layer in the conformal layer stacking irradiation.

Treatment planning apparatus and particle therapy system

The invention is intended to always ensure a sufficient level of patient positioning accuracy regardless of the skills of individual operators. In a patient positioning device for positioning a patient couchand irradiating an ion beam toward a tumor in the body of a patientfrom a particle beam irradiation section, the patient positioning device comprises an X-ray emission devicefor emitting an X-ray along a beam line m from the particle beam irradiation section, an X-ray image capturing devicefor receiving the X-ray and processing an X-ray image, a display unitB for displaying a current image of the tumor in accordance with a processed image signal, a display unitA for displaying a reference X-ray image of the tumor which is prepared in advance, and a positioning data generatorfor executing pattern matching between a comparison area A being a part of the reference X-ray image and including an isocenter and a comparison area B or a final comparison area B in the current image, thereby producing data used for positioning of the patient couchduring irradiation.

Patient positioning device and patient positioning method

Growing community of inventors

Tokyo, Japan

Shinichiro Fujitaka