PMID: 9434983Jan 22, 1998Paper

Clinical implementation of a two-component x-ray source model for calculation of head-scatter factors

Medical Physics
P A Jursinic

Abstract

A calculation method is described, which presumes that linac output has two components. One component is direct x rays from the target and the remaining component is an extra-focal, distributed source of radiation that is scattered from the flattening filter, primary collimator, and the jaws of the moveable collimator. This calculation method gives values for output factors that differ from measured values by no more than 0.5% for field widths from 4 to 40 cm, rectangular fields with long to short axis ratios as great as 10, symmetric and asymmetric fields, and source-to-axis distances from 65 to 360 cm. While this calculation method has great accuracy and flexibility, a minimal amount of input data is required: (1) measured output factors at a source-to-axis distance of 100 cm for square fields; (2) positions of the collimator with respect to the x-ray source target; and (3) output factors measured at various source-to-axis distances for a 10 cm x 10 cm field.

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Citations

Feb 13, 2001·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·T KnöösP Nilsson
Jun 19, 2003·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Jörgen OlofssonMikael Karlsson
Dec 27, 2006·Nihon Hoshasen Gijutsu Gakkai zasshi·Masanori YamadaSatoshi Igarashi
Nov 7, 2008·Nihon Hoshasen Gijutsu Gakkai zasshi·Toshifumi KasaharaSatoshi Igarashi
Aug 14, 2008·Medical Physics·Edwin ShamErvin B Podgorsak
Jun 18, 2005·The British Journal of Radiology·A T Redpath
Nov 26, 2009·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·David EatonSimon Thomas
Jul 7, 2001·Medical Physics·T C ZhuC J Yang
Apr 4, 2003·Medical Physics·Matthias FippelStephan Kriesen
May 8, 2015·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Sigamani AshokkumarRajesh Thiyagarajan
Sep 28, 2002·Medical Physics·Yong YangYimin Hu
May 5, 2000·Physics in Medicine and Biology·J F SutcliffeK W Croft

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