Abstract
Treatment plans that call for the use of multiple adjacent electron beam ports over large areas require careful consideration of the dose in the zones of overlap. A method is described to reduce the inhomogeneity utilizing acrylic resin wedges placed over contiguous treatment cone edges and a water-filled extruded polystyrene container designed to simulate the contour of the patient. The resulting improvement is demonstrated by the film dosimetry of a patient planned for post-operative radiotherapy to an intercostal malignant schwannoma with a 27 cm. long scar.
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