Abstract: An image processing device includes a processor, in which the processor is configured to receive a setting of a cut section with respect to an organ shown by a three-dimensional image, and output, as a first display image that is generated by rendering based on the three-dimensional image and shows the organ, a side viewpoint image having a side viewpoint at which the set cut section is viewed from a direction intersecting a normal line of the cut section, set as a viewpoint of the rendering.

Abstract: An image processing device includes a processor, and the processor is configured to output information for displaying a three-dimensional target part image as a three-dimensional image showing a target part, on a display device, calculate a virtual axis of the target part in the three-dimensional target part image, output information for displaying a two-dimensional image corresponding to a first cross section crossing a first position on the virtual axis, on the display device, change a geometrical characteristic of the first cross section in response to an instruction to change the geometrical characteristic, and output information for displaying a two-dimensional image corresponding to a second cross section obtained by changing the geometrical characteristic, on the display device.