| CPC A61N 5/103 (2013.01) [A61N 5/1065 (2013.01)] | 11 Claims |

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1. A radiotherapy planning apparatus, comprising:
processing circuitry configured to:
acquire dose rate distribution information indicating a distribution of a dose rate in an irradiation path of radiation based on irradiation conditions of the radiation, the dose rate changing along an irradiation depth from a body surface; and
acquire irradiation effect discrimination information for discriminating irradiation effects of radiation in the irradiation path based on the acquired dose rate distribution information.
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