A three-Gaussian fit of phantom scatter correction data

J. J M Van Gasteren, R. Van der Laarse, J. L M Venselaar, S. Heukelom, H. N. Jager, H. J. Van Kleffens, C. F. Westermann

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The phantom scatter correction factor S(p), of megavoltage photon beams can be accurately described using a three-Gaussian fit. The model leads to six parameters, with which S(p),(r) is described as a smooth function of the field radius r for beam qualities in the range from 60Co up to 25 MV. The parameters allow S(p), values to be calculated at intermediate beam energies and for any field shape. Calculated S(p)(X, Y) values for rectangular fields (X, Y) can be subsequently used as reference values to compare with measured S(p),(X, Y) values, for example when appraising a new beam.

Original languageEnglish
Pages (from-to)577-585
Number of pages9
JournalPhysics in medicine and biology
Issue number3
Publication statusPublished - 31 Mar 1998

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