Improved Corrected Algorithm of Wedge Factors in Accuracy Radiotherapy
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Graphical Abstract
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Abstract
In accuracy radiotherapy, it is difficult to calculate dose accurately during wedge fields. In this paper, an improved corrected algorithm of wedges based on the lineattenuation was proposed. The lineattenuation coefficient of wedges was calculated firstly, then the actual path of radial beam in the wedge was calculated by the “linear fitting” according to the sizes of wedges section. Finally the wedge factors could be determined accurately， and the dose could be corrected. The data of the 45 degree wedge in the report of AAPM 55 were used to make the calculation and verificaton. Using this algorithm,amount of measured data were decreased, the accuracy of calculation could be assured， and the job of physician could be reduced,so this algorithm could be applied in the treatment planning system as an effective calculation method of wedges field.
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