Abstract
The method described was developed for use during external beam irradiation of Hodgkin's disease where the field is shaped by the hotwire-styrofoam technique. A small, motor-driven routing tool is made to slide up and down along a bar which pivots from a fixed point which simulates the radiation source. This bar thus follows the diverting path of the photons as does the routing tool. The routing tool is rigidly connected to a pointer which is moved back and forth over the patient's treatment surface, and it thus is able to cut a minified surface into the styrofoam block placed at the position of the shadow tray. The hollowed-out styrofoam is then filled with wax and the compensator is completed.
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