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AUTEURS ››Benhalouche S, Sandrine Edel, Visvikis D, Pradier O, Boussion N
Titre ›› GATE Monte Carlo Simulation of a 6 MV SIEMENS Oncor™ Linear Accelerator Photon Beam : Feasibility and Preliminary Dosimetric Study
DANS ››2011 JOINT AAPM/COMP MEETING PROGRAM
PUBLIE EN ››2011
VOLUME ››38
TYPE PUBLI ››Abstract
LANGUE ››GB
Mots clés ››Monte Carlo, GATE, Dosimetry, LINAC
RESUME ››Purpose: This work is in the context of Monte Carlo simulation in radiotherapy. The objective was to study the modelling of a Siemens OncorTM linear accelerator on the GATE (Geant4 Application for Tomographic Emission) platform. A dosimetric study on water phantom was used to evaluate the reliability and the accuracy of the simulation.
Methods: The study had two different objectives: (a) the modelling of the accelerator on the GATE v6.0 platform, and (b) a preliminary dosimetric assessment.
Computations were performed in a 70×70×70 cm3 water phantom, with a 100 cm source-to-axis distance. The accelerator’s components and their geometrical and physical characteristics were defined according to the constructor specifications. The output data were obtained for a dosel (dose scoring voxel, Sarrut & Guigues 2008) of size 2.5×2.5×2.5 mm3 leading to a sensitive volume of 0.015 cm3. A comparative study of the absorbed dose in water calculated by simulation and measured was performed for the following criteria :
Photon beam quality TPR (20, 10), i.e the dose ratio at 20 cm and 10 cm in water for a 100 cm source-detector distance.
Depth dose and dose profiles.
Output factors for different field sizes.
Simulations were performed using a cluster of 26 nodes, 100 CPUs, 194 GB RAM in total.
Results: The user interface, based on macros and graphics, facilitates the modelling of different parts of the accelerator. The simulations results obtained with GATE showed a good agreement with actual measurement in water. For example, the photon beam quality obtained by simulation was 0.6725 while the measured one was 0.673.
Conclusions: These preliminary results showed good agreement with real measurements. They also are a relevant illustration of the usefulness of GATE v6.0 in the field of radiotherapy. More complex modelling involving the dynamic 160 MLC leaves movements are underway (IMRT).

INSERM :
Benhalouche S, Sandrine Edel, Visvikis D, Pradier O, Boussion N: GATE Monte Carlo Simulation of a 6 MV SIEMENS Oncor™ Linear Accelerator Photon Beam : Feasibility and Preliminary Dosimetric Study.. 2011 JOINT AAPM/COMP MEETING PROGRAM , 2011,38,3655-0,A,M,GB.]


BibTex :
@inproceedings{LaTIM-1671
author = {Benhalouche S AND Sandrine Edel AND Visvikis D AND Pradier O AND Boussion N}
title = { GATE Monte Carlo Simulation of a 6 MV SIEMENS Oncor™ Linear Accelerator Photon Beam : Feasibility and Preliminary Dosimetric Study}
booktitle = {2011 JOINT AAPM/COMP MEETING PROGRAM }
year = {2011}
volume = {38}
}

Mise à jour le Mercredi, 04 Février 2009 12:36