The Use of Photogrammetry in Tissue Compensator Design

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Abstract
The surface topography of a patient can be determined by photogrammetry before beginning cancer radiotherapy. The source light of the therapy unit or simulator is used to project a grid pattern onto the patient, and this is photographed together with control points consisting of miniature light bulbs mounted on a frame suspended from the wedge slot of the therapy machine. When the photograph is projected onto a graphics terminal for data entry into a computer, the 3-dimensional topography of the patient''s surface can be reconstructed as a 2-dimensional matrix of discrete points. A computer algorithm can design a tissue compensator to fit the individual patient.

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