Scatter factor Corrections for Elongated Fields

P. D. Higgins, C. H. Sibata, W. A. McCarthy

Research output: Contribution to journalLetterpeer-review

12 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)800-802
Number of pages3
JournalMedical Physics
Volume16
Issue number5
DOIs
StatePublished - Sep 1989

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