Abstract
A general problem in radiotherapy is to locate anatomical structures and other landmarks relative to the skin surface and reference markings. The authors have developed a computer program named COMPEN that enables the reconstruction of the skin surface from a pair of isocentric radiographs when fine metal chains are draped over the patient's skin. It is unnecessary to correlate particular points on the chains and in practice the images of the chains are simply traced into the computer using a digitiser. This program was originally developed to facilitate the production of tissue-deficit compensators but has been of value in contour production, lymph node localisation using lymphoscintigraphy and brachytherapy dose calculations.
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