And it aims to solve the evaluation of skin dose issues that could not be done visually a dose to the skin, obtain a skin dose evaluation support apparatus capable of accurately and intuitively grasp the skin dose in treatment planning to.
Skin dose evaluation support apparatus (320) based on the image data (306) inputted in the treatment planning radiation therapy for patients skin area contour creating section that creates a skin region information including the boundary coordinates of the skin region and (304), treatment planning system (102) based on the dose distribution calculation section (303) dose distribution data calculated by (311) and the skin region information, extracts a skin dose in the skin area, it is the extracted the skin dose was equipped with a display and a calculation unit (305) to create a display data (309) to be displayed in a predetermined display format.