PMID: 2509871Sep 1, 1989Paper

Scatter factor corrections for elongated fields

Medical Physics
P D HigginsW A McCarthy

Abstract

Measurements have been made to determine scatter factor corrections for elongated fields of Cobalt-60 and for nominal linear accelerator energies of 6 MV (Siemens Mevatron 67) and 18 MV (AECL Therac 20). It was found that for every energy the collimator scatter factor varies by 2% or more as the field length-to-width ratio increases beyond 3:1. The phantom scatter factor is independent of which collimator pair is elongated at these energies. For 18 MV photons it was found that the collimator scatter factor is complicated by field-size-dependent backscatter into the beam monitor.

Citations

Oct 1, 1996·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·M GosselinE B Podgorsak
Jul 1, 2008·Journal of Medical Physics·S Senthilkumar, V Ramakrishnan
Sep 28, 2002·Medical Physics·Yong YangYimin Hu

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