Verification measurements of an eMC algorithm using a 2D ion chamber array.
The aim of this study was to assess the suitability of the Im'RT MatriXX 2D ion chamber array for performing verification measurements on the Varian Eclipse electron Monte Carlo (eMC) algorithm for a range of clinical energies (6, 12, and 20 MeV) on a Varian 2100iX linear accelerator. Firstly, the suitability of the MatriXX for measuring percentage depth doses (PDD) in water was assessed, including characterization of the inherent buildup found in the MatriXX. Secondly the suitability of the MatriXX for measuring dose distributions in homogeneous and heterogeneous phantoms was assessed using gamma analysis at 3%/3 mm. It was found that after adjusting the PDD curves for the inherent buildup, that the position of R50,D measured using the MatriXX agreed to within 1 mm to the PDDs generated using the eMC algorithm for all energies used in this study. Gamma analysis at 3%/3mm showed very good agreement (> 95%) for all cases in both homogeneous and heterogeneous phantoms. It was concluded that the Im'RT MatriXX is a suitable device for performing eMC verification and could potentially be used for routine energy checks of electron beams.
Guy's & St. Thomas' NHS Foundation Trust. mark.wanklyn@nhs.net.
Mark D
MD
Wanklyn
Ghirmay
G
Kidane
Liz
L
Crees
D000465:Algorithms; D004583:Electrons; D006801:Humans; D009010:Monte Carlo Method; D010315:Particle Accelerators / Q000295:instrumentation*; D019047:Phantoms, Imaging; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods; D014867:Water / Q000737:chemistry*
D014867:Water
J Appl Clin Med Phys. 2013 Mar 04;14(2):4062
23470937
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22088999
Phys Med Biol. 2001 Feb;46(2):269-86
11229714
Med Phys. 2008 Mar;35(3):1028-38
18404938
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18716583
Phys Med Biol. 2006 Jun 7;51(11):2781-99
16723766
J Appl Clin Med Phys. 2009 Jul 09;10(3):2834
19692969
Phys Med Biol. 1995 Apr;40(4):543-74
7610114
Med Phys. 2006 Jun;33(6):1540-51
16872061
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25674999
Med Phys. 1998 Nov;25(11):2093-115
9829234