EXPERIMENTAL VERIFICATION OF A METHOD FOR VARYING THE EFFECTIVE ANGLE OF WEDGE FILTERS

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Abstract
A wide range of wedge angles smaller than the nominal wedge angle can be obtained with a single wedge filter by irradiating partly with, and partly without, the wedge filter inserted in the radiation beam. The desired wedge angle is produced by the appropriate choice of weighting factors. The validity of this method for varying the effective angle of wedge filters has been established experimentally by measurements made in a masonite phantom with lithium fluoride thermoluminescent detectors. The use of a spectrum of wedge angles allows for a more uniform dose distribution to the treatment volume.

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