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An optical system for measuring surface shapes for radiotherapy planning

Department of Medical Physics, Torbay Hospital, Newton Road, Torquay, Devon TQ2 7AA, UK

A system which uses two remote cameras to obtain surface contours for radiotherapy patients is described. Two variants are presented: one which requires couch movement to obtain multiple outlines, and one utilizing a special illumination method to achieve multiple outlines from one image per camera. In addition, a technique is discussed in which the grey-scale information from the skin surface (e.g., skin marks placed by the radiotherapist) may be utilized in displaying three-dimensional surface information. The system may also be used to monitor patient position in real time during each treatment.

Received for publication July 6, 1992. Revision received September 15, 1992. Accepted for publication September 28, 1992.

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