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Measuring the Behavioral Effects of Intraocular Scatter
Published on: February 18, 2021
Theoretical and experimental determination of phantom scatter factors for photon fields with different radial energy
A Sätherberg1, M Karlsson, M Karlsson
1Department of Radiation Physics, Umeå University, Sweden.
Abstract:
The output factor used for monitor unit determination in radiotherapy can be divided into two factors: the head scatter factor and the phantom scatter factor. Theoretical and experimental phantom scatter factors have been compared for different beam qualities between 4 MV and 50 MV and field sizes from 5 cm x 5 cm to 30 cm x 30 cm. The theoretical data were obtained through a convolution method based on Monte Carlo calculated energy spectra and dose kernels. The calculations have been performed both for accelerators with a rather large energy variation within the field and for accelerators with a constant energy distribution in the field. Deviations between theoretical and experimental data were found to be less than 1%.
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