title: A three-Gaussian fit of phantom scatter correction data.
abstract: The phantom scatter correction factor Sp of megavoltage photon beams can be accurately described using a three-Gaussian fit. The model leads to six parameters, with which Sp(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 Sp values to be calculated at intermediate beam energies and for any field shape. Calculated Sp(X, Y) values for rectangular fields (X, Y) can be subsequently used as reference values to compare with measured Sp(X, Y) values, for example when appraising a new beam.
authors.affiliation: Nucletron BV, Veenendaal, The Netherlands.
authors.forename: J J
authors.initials: JJ
authors.lastname: van Gasteren
authors.forename: R
authors.initials: R
authors.lastname: van der Laarse
authors.forename: J L
authors.initials: JL
authors.lastname: Venselaar
authors.forename: S
authors.initials: S
authors.lastname: Heukelom
authors.forename: H N
authors.initials: HN
authors.lastname: Jager
authors.forename: H J
authors.initials: HJ
authors.lastname: van Kleffens
authors.forename: C F
authors.initials: CF
authors.lastname: Westermann
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D006801:Humans; D008962:Models, Theoretical; D016011:Normal Distribution; D019047:Phantoms, Imaging; D017785:Photons / Q000627:therapeutic use; D011880:Radiotherapy Planning, Computer-Assisted / Q000706:statistics & numerical data*; D011882:Radiotherapy, High-Energy; D012542:Scattering, Radiation