Abstract: A particle-accelerator diagnostic technology capable of evaluating extraction efficiency of charged particles in a short cycle is provided. A diagnostic device for a particle accelerator includes: a first receiver configured to receive a first detection signal from a first detector that detects a first current value generated by movement of charged particles in a circular accelerator, the first detection signal being outputted as a signal corresponding to the first current value; a second receiver configured to receive a second detection signal from a second detector that detects a second current value generated by movement of charged particles extracted from the circular accelerator into a beam transport system, the second detection signal being outputted as a signal corresponding to the second current value; and a calculator configured to calculate an extraction efficiency of charged particles based on the first and second detection signals.

Abstract: A control method for an accelerator according to the present embodiment is a control method for an accelerator that supplies a current generating a magnetic field to a plurality of deflection electromagnets based on a current-value instruction signal. The method includes providing a flat region that makes a current value of the deflection electromagnet constant in a case of an acceleration cycle involving emission of the charged particles, not providing the flat region in the current-value instruction signal in a case of an acceleration cycle, smoothing time change of a current value in a transition of the current value to the flat region or a transition from the flat region, and determining a time required for the smoothing based on a predetermined energy for extracting the charged particles or a difference between energies before and after change to the predetermined extraction energy.

Abstract: A particle beam adjustment device includes: a position monitor that detects a positional deviation of a particle beam transported from a beam transport section; an interlock device to interrupt irradiation of the particle beam when a positional deviation of the particle beam is detected by the position monitor; a pair of screen monitors that measure position and angle of an axis of the particle beam; a correction electromagnet that controls the axis of the particle beam by adjusting a magnetic field on a basis of a signal indicating the particle beam position and angle measured by the screen monitors; and a beam scanning electromagnet that irradiates an irradiation target with the particle beam. One of the screen monitors is installed outside a treatment room, and the other screen monitor and the position monitor are installed inside the treatment room.

Abstract: According to some embodiments, an accelerator control device has a high-frequency power controller and a timing controller. The high-frequency power controller supplies high frequency power for accelerating a charged particle beam to an accelerator. The timing controller controls an operation timing of a blocker that blocks the charged particle beam emitted from the accelerator based on a current value of the charged particle beam circulating in the accelerator.

Abstract: According to some embodiments, an accelerator control device has a high-frequency power controller and a timing controller. The high-frequency power controller supplies high frequency power for accelerating a charged particle beam to an accelerator. The tinting controller controls an operation timing of a blocker that blocks the charged particle beam emitted from the accelerator based on a current value of the charged particle beam circulating in the accelerator.

Abstract: A particle beam adjustment device includes: a position monitor that detects a positional deviation of a particle beam transported from a beam transport section; an interlock device to interrupt irradiation of the particle beam when a positional deviation of the particle beam is detected by the position monitor; a pair of screen monitors that measure position and angle of an axis of the particle beam; a correction electromagnet that controls the axis of the particle beam by adjusting a magnetic field on a basis of a signal indicating the particle beam position and angle measured by the screen monitors; and a beam scanning electromagnet that irradiates an irradiation target with the particle beam. One of the screen monitors is installed outside a treatment room, and the other screen monitor and the position monitor are installed inside the treatment room.

Abstract: Provided is a particle beam irradiation apparatus capable of highly reliable measurement of a dose of each beam and capable of highly sensitive measurement of a leakage dose caused by momentary beam emission.

Abstract: A particle beam irradiation apparatus that can measure and display a dose two-dimensional distribution during scan while reducing degradation of a particle beam shape, including a particle beam generation portion; a particle beam emission control portion; a two-dimensional beam scanning portion; a sensor portion including first linear electrodes arranged in parallel in a first direction and second linear electrodes arranged in parallel in a second direction orthogonal to the first direction; a beam shape calculation portion that calculates a center of gravity of the particle beam from outputs of each the first linear and second linear electrodes and that obtains a two-dimensional beam shape of the particle beam around the center of gravity; a storage portion that accumulates and stores the two-dimensional beam shapes; and a display portion that displays the two-dimensional beam shapes as a two-dimensional distribution of a dose.

Abstract: A particle beam irradiation apparatus includes: a beam generation unit that generates a particle beam; a beam emission control unit that controls emission of the particle beam; a beam scanning instruction unit that sequentially two-dimensionally instructs a position of the particle beam so that the particle beam is scanned across the entire slice; a beam scanning unit that two-dimensionally scans the particle beam; a respiration gate generation unit that generates a respiration gate synchronized with a respiration cycle of the patient; and a pulse generation unit that generates a predetermined number of scanning start pulses at substantially equally spaced time intervals in the respiration gate. The beam scanning instruction unit instructs to scan the entire slice by pattern irradiation based on a set dose from each of the scanning start pulses so that a scan of the same slice is repeated the predetermined number of times.

Abstract: A particle beam irradiation apparatus includes a beam scanning indication unit which two-dimensionally indicates a position of a particle beam in series for each of slices obtained by dividing an affected area to be irradiated in an axial direction of the particle beam, a beam scanning unit which two-dimensionally scans the particle beam based on an indication signal from the beam scanning indication unit, a phosphor film which is provided between the beam scanning unit and a patient and emits light in an amount corresponding to a particle dose of the particle beam transmitting therethrough, an imaging unit which images the phosphor film for each of the slices, and a display unit which obtains an irradiation dose distribution of each of the slices from image data imaged by the imaging unit and displays the obtained irradiation dose distribution associated with a scanning position of the particle beam.

Abstract: Provided is a particle beam irradiation apparatus capable of highly reliable measurement of a dose of each beam and capable of highly sensitive measurement of a leakage dose caused by momentary beam emission.

Abstract: Provided is a particle beam irradiation apparatus that can measure and display a dose two-dimensional distribution during scan with a simple configuration, while reducing degradation of a particle beam shape.

Abstract: The particle beam irradiation apparatus according to the present invention comprises: a beam generation unit; a beam emission control unit which controls emission of the particle beam; a beam scanning indication unit which two-dimensionally indicates a position of the particle beam in series for each of slices obtained by dividing an affected area to be irradiated in an axial direction of the particle beam; a beam scanning unit which two-dimensionally scans the particle beam based on an indication signal from the beam scanning indication unit; a phosphor film which is provided between the beam scanning unit and a patient and emits light in an amount corresponding to a particle dose of the particle beam transmitting therethrough; an imaging unit which images the phosphor film for each slice; and a display unit which obtains an irradiation dose distribution of each slice from image data imaged by the imaging unit and displays the obtained irradiation dose distribution associated with a scanning position of the

Abstract: A particle beam irradiation apparatus includes: a beam generation unit that generates a particle beam; a beam emission control unit that controls emission of the particle beam; a beam scanning instruction unit that sequentially two-dimensionally instructs a position of the particle beam so that the particle beam is scanned across the entire slice; a beam scanning unit that two-dimensionally scans the particle beam; a respiration gate generation unit that generates a respiration gate synchronized with a respiration cycle of the patient; and a pulse generation unit that generates a predetermined number of scanning start pulses at substantially equally spaced time intervals in the respiration gate. The beam scanning instruction unit instructs to scan the entire slice by pattern irradiation based on a set dose from each of the scanning start pulses so that a scan of the same slice is repeated the predetermined number of times.