Ionization chamber gradient effects in nonstandard beam configurations

Medical Physics
Hugo BouchardIwan Kawrakow

Abstract

For the purpose of nonstandard beam reference dosimetry, the current concept of reporting absorbed dose at a point in water located at a representative position in the chamber volume is investigated in detail. As new nonstandard beam reference dosimetry protocols are under development, an evaluation of the role played by the definition of point of measurement could lead to conceptual improvements prior to establishing measurement procedures. The present study uses the current definition of reporting absorbed dose to calculate ionization chamber perturbation factors for two cylindrical chamber models (Exradin A12 and A14) using the Monte Carlo method. The EGSnrc based user-code EGS_chamber is used to calculate chamber dose responses of 14 IMRT beams chosen to cause considerable dose gradients over the chamber volume as previously used by Bouchard and Seuntjens ["Ionization chamber-based reference dosimetry of intensity modulated radiation beams," Med. Phys. 31(9), 2454-5465 (2004)]. The study shows conclusively the relative importance of each physical effect involved in the nonstandard beam correction factors of 14 IMRT beams. Of all correction factors involved in the dosimetry of the beams studied, the gradient perturbation cor...Continue Reading

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Jul 29, 2006·Medical Physics·Iwan Kawrakow
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Citations

Aug 24, 2012·Journal of Radiation Research·Shimpei HashimotoHidetoshi Saitoh
Jan 7, 2014·Medical Physics·Edmond SterpinHugo Bouchard
Mar 3, 2012·Medical Physics·Hugo BouchardHugo Palmans
Jan 30, 2013·Zeitschrift für medizinische Physik·Hui Khee LooeBjörn Poppe
Oct 3, 2015·Medical Physics·Hugo BouchardHugo Palmans
May 28, 2016·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Christelle HuetIsabelle Clairand
May 15, 2018·Physics in Medicine and Biology·John D FenwickAlan E Nahum
Jul 6, 2018·Physics in Medicine and Biology·Damian CzarneckiKlemens Zink
Sep 13, 2018·Physics in Medicine and Biology·John D FenwickSudhir Kumar
Nov 19, 2018·Medical Physics·Vimal K DesaiWesley S Culberson
May 10, 2017·Physics in Medicine and Biology·A Kulmala, M Tenhunen
May 11, 2012·Physics in Medicine and Biology·Hugo Bouchard
Jun 23, 2012·Physics in Medicine and Biology·Alison J D ScottJohn D Fenwick
Apr 4, 2014·Physics in Medicine and Biology·Alexandra E BourqueHugo Bouchard
Sep 12, 2014·Physics in Medicine and Biology·P PapaconstadopoulosJ Seuntjens
Mar 22, 2013·Physics in Medicine and Biology·D Czarnecki, K Zink
Sep 12, 2014·Physics in Medicine and Biology·Anna RalstonNatalka Suchowerska
Mar 22, 2013·Physics in Medicine and Biology·A WagnerN Reynaert
Dec 31, 2016·Physics in Medicine and Biology·Pedro Andreo, Hamza Benmakhlouf
Oct 24, 2017·Physics in Medicine and Biology·E ChristiansenE Vandervoort
Jul 17, 2020·Physics in Medicine and Biology·Yunuen CervantesHugo Bouchard

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