Patent ID: 11904185
Assignee: HITACHI, LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A particle therapy system, comprising:
a particle irradiation system for irradiating a target with a particle beam;
an irradiation control system that is configured to control the particle irradiation system;
an irradiation amount measurement instrument that is configured to measure an irradiation amount of the particle beam emitted to the target;
an irradiation position measurement instrument that is configured to measure a position of the particle beam emitted to the target;
a dose calculation system that is configured to calculate an actual dose distribution emitted to the target by using measurement data of the irradiation amount measurement instrument and the irradiation position measurement instrument;
a display system that is configured to display an obtained dose distribution; and
a dose calculation control system that is configured to select calculation intervals for calculating the actual dose distribution and controls a calculation state of the actual dose distribution,
wherein the dose calculation system is configured to store a plurality of 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,
wherein the dose calculation system is configured to calculate, during the irradiation, the actual dose distribution according to the calculation interval selected among the plurality of the calculation intervals,
wherein the plurality of calculation intervals includes at least one of 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,
wherein the display system is configured to display on a screen at least one of the estimated dose distribution and the dose evaluation index.