Radiation transmission, leakage and beam penumbra measurements of a micro-multileaf collimator using GafChromic EBT film.

Journal of Applied Clinical Medical Physics
O A García-GarduñoMercedes Rodríguez-Villafuerte

Abstract

Micro-multileaf collimator systems coupled to linear accelerators for radioneurosurgery treatments require a rigorous dosimetric characterization in order to be used in 3D conformal and intensity modulated stereotactic radiosurgery and radiotherapy applications. This characterization involves high precision measurements of leaf transmission, leakage and beam penumbra through the collimation system and requires the use of detectors with high spatial resolution, high sensitivity and practically no energy dependence. In this work the use of GafChromic EBT radiochromic film to measure the basic dosimetric properties of the m3-mMLC (BrainLAB, Germany) micro-multileaf collimator system integrated to a 6 MV linear accelerator, is reported. Results show that average values of transmission and leakage radiation are 0.93 +/- 0.05% and 1.08 +/- 0.08%, respectively. The 80-20% beam penumbra were found to be 2.26 +/- 0.11 mm along the leaf side (perpendicular to leaf motion) and 2.31 +/- 0.11 mm along the leaf end (parallel to leaf motion) using square field sizes ranging from 9.1 to 1.8 cm. These measurements are in agreement with values reported in the literature for the same type of mMLC using different radiation detectors.

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Citations

Mar 17, 2010·Medical Physics·Patricia LindsayDavid Jaffray
Jul 2, 2010·Journal of Applied Clinical Medical Physics·Marcus FischerFlorian Cremers
Jul 10, 2010·Physics in Medicine and Biology·T KairnJ Kenny
Apr 6, 2011·Australasian Physical & Engineering Sciences in Medicine·T AlandJ Kenny
Aug 24, 2011·Medical Physics·Mohamed M GalalSultan Khalil
Sep 7, 2012·Physics in Medicine and Biology·Liyun ChangSheng-Yow Ho
May 22, 2009·Journal of Applied Clinical Medical Physics·R Alfredo Siochi
Oct 27, 2011·Nihon Hoshasen Gijutsu Gakkai zasshi·Daisaku TatsumiMasako Hosono
Dec 7, 2018·Physics in Medicine and Biology·Yue-Houng HuRoss I Berbeco
Jul 4, 2012·Physics in Medicine and Biology·G A GodwinK V Mugabe
Feb 11, 2014·Medical Physics·Liyun ChangPang-Yu Chen
Nov 10, 2018·Journal of Applied Clinical Medical Physics·Klaus BratengeierSonja Wegener
May 16, 2012·Journal of Applied Clinical Medical Physics·Jinkoo KimSamuel Ryu
Aug 19, 2010·Journal of Applied Clinical Medical Physics·Vladimir FaygelmanGeoffrey Zhang
Apr 1, 2015·Physics in Medicine and Biology·A BöhlerH Deutschmann
Sep 30, 2016·Journal of Applied Clinical Medical Physics·Elsa Y León MarroquinOlivia A García-Garduño
Nov 22, 2013·Journal of Applied Clinical Medical Physics·Karina P Esparza-MorenoMiguel A Celis-Lopez
Sep 30, 2020·Medical Physics·Azam Niroomand-RadMaria F Chan
Nov 7, 2020·Journal of Applied Clinical Medical Physics·Spencer M RobinsonMagdalena Bazalova-Carter

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Methods Mentioned

BETA
light scattering

Software Mentioned

ImageJ
FileScan

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