A photon dose distribution model employing convolution calculations

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Abstract
A 3-dimensional photon beam calculation is described which models the primary, first-scatter, and multiple-scatter dose components from first principles. Three key features of the model are a multiple-scatter calculation based on diffusion theory; the demonstration of the modulation transfer function of the radiation dose transport process; and the use of the finite fast Fourier transform to perform the required convolutions. The results of calculations for cobalt-60 in a homogeneous phantom are used to verify the accuracy of the model.