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Laparoscopic surgery without ventrotomy has been widely used in recent years for quick recovery and out of pain of patients. However, surgeons are required to accumulate various experiences for this surgery since the difficulty in perceiving the positions of tissues by the limited field of view (FOV) of laparoscopes and the operational difficulties of forceps. In this paper, we propose a new laparoscopic surgery supporting system using projected images. The image of the FOV of a laparoscope is projected directly onto the abdominal surface of a patient. The shape distortion of the projected images produced by the unevenness of the abdominal surface is corrected by grating projection. The distortion due to the viewing angle of the surgeon is also corrected by using an electromagnetic tracking sensor. It is shown that the proposed system is significant to laparoscopic surgery, particularly for forceps insertion, by experiments using a model of the abdomen made with a dry box.

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