Therapy planning apparatus and particle radiation therapy apparatus

A treatment planning apparatus configured to formulate a treatment plan that allows a particle beam therapy system to irradiate an irradiation object with a particle beam extracted from an accelerator, by switching between a scanning irradiation from a scanning irradiation nozzle mounted with scanning irradiation use parts for the scanning irradiation that is performed while shifting the particle beam and controlling an irradiation dose imparted to each of points in the irradiation object and a broad irradiation from a broad irradiation nozzle mounted with broad irradiation use parts for the broad irradiation that is performed by controlling a total irradiation dose imparted to a region in the irradiation object, the treatment planning apparatus comprising:

• an overall data management unit configured to store a target irradiation dose distribution to be formed in the irradiation object;
• a broad irradiation parameter calculation unit configured to calculate operational parameters for respective devices, such as the accelerator and the broad irradiation nozzle, to operate during the broad irradiation;
• and
• a scanning irradiation parameter calculation unit configured to calculate operational parameters for the respective devices, such as the accelerator and the scanning irradiation nozzle, to operate during the scanning irradiation,
• wherein the broad irradiation parameter calculation unit and the scanning irradiation parameter calculation unit cooperatively calculate and determine the operational parameters for the respective devices, such as the accelerator and the broad irradiation nozzle, to operate during the broad irradiation and the operational parameters for the respective devices, such as the accelerator and the scanning irradiation nozzle, to operate during the scanning irradiation, so that the sum of irradiation doses imparted by both broad irradiation and scanning irradiation forms the target irradiation dose distribution.