Patent ID: 11904185
Assignee: NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 11:
12. A method for operating a particle therapy system including a particle irradiation system for irradiating a target with a particle beam, an irradiation control system that controls the particle irradiation system, an irradiation amount measurement instrument that measures an irradiation amount of the particle beam emitted to the target, and an irradiation position measurement instrument that measures a position of the particle beam emitted to the target, the method comprising:
calculating, by a dose calculation system, an actual dose distribution emitted to the target by using measurement data of the irradiation amount measurement instrument and the irradiation position measurement instrument;
displaying, by a display system, the obtained actual dose distribution;
selecting, by a dose calculation control system, calculation intervals for calculating the actual dose distribution, and controlling, by the dose calculation control system, a calculation state of the actual dose distribution;
storing, by the dose calculation system, the calculation intervals, and at least one of the plurality of the calculation intervals is selected via the dose calculation control system before irradiating the target with the particle beam;
calculating, during the irradiation, the actual dose distribution according to the calculation interval selected among the plurality of calculation intervals,
wherein the plurality of calculation intervals includes at least an energy change of changing the particle beam from a first energy to a second energy and an irradiation angle change from a first angle to a second angle,
wherein the dose calculation system:
obtains a previously stored planned dose distribution,
calculates a differential dose distribution between the planned dose distribution and the actual dose distribution at the selected calculation interval, and
calculates an estimated dose distribution by integrating the differential dose distribution for each selected calculation interval with respect to the planned dose distribution, and
calculates a dose evaluation index from the estimated dose distribution, and
wherein the display system displays on a screen at least one of the estimated dose distribution and the dose evaluation index.