초록 ▼

An irradiation dose calculating unit can solve a problem of a conventional irradiation dose calculating unit in that since irradiation doses from portals are empirically determined, it is likely that optimum irradiation doses are not established for a target and a critical organ. A prescription data

An irradiation dose calculating unit can solve a problem of a conventional irradiation dose calculating unit in that since irradiation doses from portals are empirically determined, it is likely that optimum irradiation doses are not established for a target and a critical organ. A prescription data input section is used for a physician to input prescription data designating doses to a target and a critical organ. First and second object function calculating sections each calculate predefined indices, and obtain a first object function representing the level of satisfaction for the critical organ and a second object function representing the level of satisfaction for the target and critical organ. The irradiation doses from the portals are calculated based on these object functions such that the prescription data are satisfied.

대표청구항 ▼

[ What is claimed is:] [1.]1. An irradiation dose calculating unit comprising:a prescription data input section for receiving prescription data including a prescription dose, a minimum dose, a maximum dose, and an underdose volume fraction for at least one target, and a limiting dose, a maximum dose

[ What is claimed is:] [1.]1. An irradiation dose calculating unit comprising:a prescription data input section for receiving prescription data including a prescription dose, a minimum dose, a maximum dose, and an underdose volume fraction for at least one target, and a limiting dose, a maximum dose, and an overdose volume fraction for at least one critical organ;an absorbed dose distribution calculating section for calculating absorbed dose distributions of radiation beams irradiated from a plurality of portals to the target;a first object function calculating section for calculating a first object function from the prescription data, irradiation dose ratios of the radiation beams irradiated from the portals to the target, and the absorbed dose distributions calculated by said absorbed dose distribution calculating section, the first object function indicating a level of satisfaction of the prescription data for the critical organ;an irradiation dose ratio calculating section for calculating the irradiation dose ratios that optimize the first object function;a second object function calculating section for calculating a second object function from the prescription data and a product of a scaling parameter multiplied by a sum of products obtained by multiplying the absorbed dose distributions for the portals by the irradiated dose ratios for the portals calculated by said irradiation dose ratio calculating section, the second object function indicating a level of satisfaction of the prescription data for the target and the critical organ;a scaling parameter calculating section for calculating the scaling parameter that optimizes the second object function; andan irradiation dose determining section for determining the irradiation doses from the portals from at least the scaling parameter calculated by said scaling parameter calculating section, the irradiation dose ratios for the portals calculated by said irradiation dose ratio calculating section, and the absorbed does distributions for the portals.