Phototherapy planning device and phototherapy planning method

A phototherapy planning device comprising:

• a three-dimensional image acquisition unit configured to acquire a three-dimensional surface image showing an affected part of a subject and a three-dimensional surface shape of the subject;
• a rod-shaped member position adjustment unit configured to adjust a position of a rod-shaped member when inserting the rod-shaped member into the affected part on an image space, with respect to the three-dimensional surface image;
• a light propagation region acquisition unit configured to acquire a light propagation region in which light propagates from the rod-shaped member;
• a cross-sectional image generation unit configured to generate a cross-sectional image that displays, in a predetermined cross-section of the three-dimensional surface image, an internal morphological image including the affected part of the subject, the rod-shaped member, and the light propagation region;
• and
• a display control unit configured to perform control for displaying the cross-sectional image.