AbstractWith the current rapid advances in computer graphics and CAD/CAM technology, considerable research is being done on the display of three‐dimensional images, and this includes the medical field. One typical medical application is simulated surgery, of which bone cutting is an essential part. Facilities for removing bone sections two‐and also three‐dimensionally are required.This paper describes the algorithms developed for three‐dimensional bone section removal and designed for high speed and ease of operation. An actual plastic surgery case to which our algorithms were applied is presented. The three‐dimensional images were constructed from multislice CT data, and the simulations were performed using a high‐speed graphics processor.