Hitachi, Ltd.

Hitachi High-tech Corporation

Hideaki Nishiuchi

Masumi Umezawa

Kunio Moriyama

Takuya Nomura

Kazuyoshi Saito

Takayoshi Seki

Takamichi Aoki

Shigemitsu Hara

Kazuo Hiramoto

Masahiro Tadokoro

Satoshi Totake

Fuutarou Ebina

Futaro Ebina

Koji Tobinaga

Yusuke Vincent Fujii

Hiroshi Akiyama

Koji Matsuda

Hiroyuki Satake

Takahide Nakayama

Taisuke Takayanagi

Tadashi Katayose

Hideaki Nihongi

Katsuhisa Ike

Kenichi Takizawa

Yusuke Fujii

Tomohisa Iwamoto

Tomohisa Imagawa

Moemi Takeda

Toshiyuki Terunuma

Takeji Sakae

Kosuke Ogasawara

Yui Shinozawa

Yujiro Fujisaki

Seiji Yoshiura

Kimiko Okazaki

An installation area of a particle beam treatment system is reduced. The particle beam irradiation system includes an accelerator which is installed on a floor surface and accelerates a charged particle beam, a transport device which transports the charged particle beam emitted from the accelerator, an irradiation device which irradiates an irradiation target with the charged particle beam transported by the transport device, and a gantry which is installed on the floor surface, and to which the irradiation device is attached. The gantry includes a rotating body which rotates the irradiation device about the irradiation target, and a support device which supports the rotating body from the floor surface at a position where a projection plane of the rotating body on the floor surface and a projection plane of the accelerator or the transport device on the floor surface at least partially overlap with each other.

Particle beam irradiation system and particle beam irradiation facility

A particle therapy system includes a building having a first floor and second floors and, a particle beam generator installed on the first floor and configured to generate a particle beam, a first transport system configured to transport a particle beam from the particle beam generator to a first irradiation system in a first treatment room, and a second transport system configured to transport a particle beam to a second irradiation system in a second treatment room, branched from the first transport system, via a second floor. The second transport system has a first bending magnet that bends a particle beam to the direction of the second floor different from the installation surface of the particle beam generator. The building has a shielding wall configured to shield the first floor and the second floor and the second transport system is provided penetrating the shielding wall.

Particle therapy system and extension method thereof

Ion beams are efficiently extracted with an accelerator that includes a circular vacuum container including a pair of circular return yokes facing each other. Six magnetic poles are radially disposed from the injection electrode at the periphery thereof in the return yoke. Six recessions are disposed alternately with the respective magnetic poles in the circumferential direction of the return yoke. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories centered around the injection electrode are present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrode are present, is formed around the region. In the eccentric trajectory region, the beam turning trajectories are dense between the injection electrode and the inlet of the beam extraction path. Gaps between the beam turning trajectories are wide in a direction 180&#xb0; opposite to the inlet of the beam extraction path.

Accelerator and particle beam irradiation system

A monitoring and diagnosis system reduces a load at the time of collecting operation state information of a plant apparatus and is inexpensive. A plant includes a plant apparatus, a local control device that controls the plant apparatus on the basis of operation state information of the plant apparatus from a sensor, and a high-order control system that is connected to the local control device and controls the operation of the entire plant. A monitoring subsystem performs failure diagnosis in accordance with a failure diagnosis algorithm which is set in advance, on the basis of the operation state information acquired from the local control device. A monitoring and diagnosis system collects results of the failure diagnosis performed by the monitoring subsystem and pieces of operation state information of the plant apparatus which are consolidated by the monitoring subsystem.

Monitoring system, particle beam therapy system, and method of repairing plant

An acceleratorincludes a circular vacuum container including circular return yokesA,B. An injection electrodeis disposed closer to an inlet of a beam extraction pathin the return yokeB than a central axis C of the vacuum container. Magnetic polesA toF are radially disposed from the injection electrodeat the periphery of the injection electrodein the return yokeB. RecessionsA toF are disposed alternately with the magnetic polesA toF in the circumferential direction of the return yokeB. In the vacuum container, a concentric trajectory region, in which multiple beam turning trajectories centered around the injection electrodeare present, is formed, and an eccentric trajectory region, in which multiple beam turning trajectories eccentric from the injection electrodeare present, is formed around the region.

The accelerator includes a circular vacuum container which contains a circular return yoke. With respect to the central axis of the vacuum container, an incidence electrode is arranged towards the entrance of a beam emission path inside of the return yoke. Inside of the return yoke, electrodes are arranged radially from the incidence electrode in the periphery of the incidence electrode. Recesses are arranged alternately with the electrodes in the circumferential direction of the return yoke. In the vacuum container, an orbit-concentric region is formed in which multiple beam orbits centered on the incidence electrode are present, and, in the periphery of said region, an orbit-eccentric area is formed in which multiple beam orbits eccentric to the incidence electrode are present. In the orbit-eccentric region, the beam orbits between the incidence electrode and the entrance to the beam emission path are denser.

At the start of beam extraction, the amplitude value of an acceleration radio frequency voltage is held at a first amplitude value. When the irradiation dose stemming from beam extraction reaches a prescribed dose, the amplitude value of the acceleration radio frequency voltage applied to an accelerating cavity starts to be increased from the first amplitude value to a second amplitude value. When the irradiation dose reaches a target dose, the amplitude value is raised to and held at the second amplitude value. By the time the irradiation is restarted, the amplitude value of the acceleration radio frequency voltage applied to the accelerating cavity is reduced from the second amplitude value to the first amplitude value. At the start of beam extraction, the amplitude value is held at the first amplitude value.

Radio frequency voltage control system in synchrotron accelerating cavity

A particle beam therapy system is disclosed which includes: a synchrotron accelerating a charged particle beam injected from a pre-accelerator up to a predetermined energy level before applying a high-frequency voltage to an extraction device to extract the charged particle beam caused to exceed a stability limit; a beam transportation system transporting the charged particle beam extracted from the synchrotron up to a treatment room, and an irradiation device irradiating a patient in the treatment room with the charged particle beam in conformity to the patient's tumor shape. The synchrotron has functionality to accelerate or decelerate the charged particle beam successively to extract the charged particle beam at a plurality of energy levels during an extraction phase of the synchrotron, the beam transportation system further having functionality to block off an unnecessary charged particle beam extracted from the synchrotron during acceleration or deceleration.

Particle beam therapy system

When controlling the ejection of a charged particle beam from a synchrotron, a radiofrequency voltage is applied, which serves as the radio-frequency voltage to be applied to an ejection radio-frequency electrode equipping the synchrotron, and which is constituted by a first radio-frequency voltage for increasing an oscillation amplitude in such a way as to exceed a stable limit in order to eject to the exterior of the synchrotron a beam that circles inside the synchrotron, and a second radio-frequency voltage for preferentially ejecting a charged particle beam that circles in the vicinity of the stable limit, with the amplitude value of the second radiofrequency voltage being controlled in such a way that the amplitude value is 0 prior to the beam ejection start, the amplitude value increases gradually from the beam ejection start, and, once a predetermined amplitude value has been reached, this value is maintained.

Charged particle beam radiation system, synchrotron, and beam ejection method therefor

Operation control data of each of the constituent sub-units of a synchrotron is constructed by a combination of module data items (initial acceleration data item, plural energy change data items, and a deceleration control data item), corresponding to plural control intervals, respectively. A control start value, a control completion value, and a computing function for connecting the control start value with the control completion value are expressed in each of module data items. Further, the plural module data items are corrected on the basis of a correction data item of a residual field, and a power-supply control command value is sequentially outputted. By preparing correction table data of the residual field, expressed by irradiation energy and irradiation stage numbers of the irradiation energy beforehand, the correction table data items of the plural module data items are selected from the correction table data to be prepared.

Particle beam irradiation system and method for operating the same

A particle beam irradiation system having a multi-energy extraction control operation that controls the extraction beam energy in a synchrotron within a short time, such that when the ion beam irradiation is halted, an operating cycle is updated within a short time and a dose rate is improved. To this end, operating control data for each of the devices constituting the synchrotron is constructed by multi-energy extraction control pattern data for controlling extraction of beams of a plurality of energy levels at one operating cycle, and a plurality of sets of deceleration control data that correspond to the extraction control of the beam of the plurality of energy levels. The devices are controlled by using the operating control data.

Particle beam irradiation system and operating method

A charged particle beam irradiation system in which the energy, Bragg peak, and irradiation depth of a charged particle beam, with which a patient is to be irradiated, can be checked in real time just before actual irradiation. Just before the actual irradiation, by providing a high-speed steering magnet with 100% current, a checking beam is intentionally hit into a beam damper. By using a dosimeter and a dose measuring device in front thereof, extraction beam intensity is measured. By using a multi-layer beam monitor, a dose distribution thereof is measured. Accordingly, just before the actual irradiation, the energy, Bragg peak, and irradiation depth of the charged particle beam, with which the patient is to be irradiated, can be checked accurately and in real time. When the beam has a desired dose distribution as a result of checking, continuously, extraction control is performed.

Charged particle beam irradiation system and operating method of charged particle beam irradiation system

The operation control data about the component device constituting the synchrotronare structured to include an initial acceleration control data item, a plural extraction control data items, a plural energy change control data items that connect the plural extraction control data items. The plural extraction control data items include extraction condition setting data items and extraction condition cancellation data items corresponding to the plural extraction control data items. As a result, a particle beam irradiation system capable of controlling changes in beam energy, updating operation cycle, and extracting beam in a short time can be provided.

A stacked type of radiation detector and a calibration method that enables the radiation detector to correct variations in sensor-specific output easily and within a short time, without using a water-phantom dose detector. The radiation detector is equipped with a sensor section including a plurality of sensors arranged in layers in a traveling direction of a particle beam. A dummy absorber has water-equivalent thickness equal to an average water-equivalent thickness of the sensors. A signal-processing unit calculates sensor-specific calibration coefficients using a measurement result obtained during irradiation of the radiation detector with the radiation when electrical signals developed in each sensor are measured, and a measurement result obtained during irradiation of the radiation detector with the radiation when the sensor section is moved in the traveling direction of the radiation, then the dummy absorber is set in place, and electrical signals developed in each sensor are measured.

Calibration method for radiation detector, and particle therapy system

A control data about the devices constituting the synchrotron are formed by an initial acceleration control data item, a plural extraction control data items, a plural energy change control data items connecting the plural extraction control data items, and a plural deceleration control data items corresponding to the plural extraction control data items. An affected part position detection unit and an extraction permission determination unit are provided to determine whether the position of a marker shown in transparent image information is included within a beam irradiation permission range. If the marker position is found included, the extraction permission determination unit outputs to an interlock system an extraction permission determination signal permitting beam extraction.

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Tokyo, Japan

Hideaki Nishiuchi