Monte Carlo Simulation of a 18 MV Medical Linac Photon Beam Using GATE/GEANT4

In radiotherapy applications, Monte Carlo (MC) simulation for dose calculations is well acknowledged for its accuracy in predicting dose deposition in the patient. The full modeling of a high-energy photon beam from Varian Clinac 2100C 18 MV medical linear accelerator is presented here by using the...

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Bibliographic Details
Published in:Moscow University physics bulletin 2021, Vol.76 (1), p.15-21
Main Authors: Fiak, M., Fathi, A., Inchaouh, J., Khouaja, A., Benider, A., Krim, M., Harakat, N., Housni, Z., Bouhssa, M. L., Mouadil, M., Elabssaoui, Y., Jdair, O.
Format: Article
Language:English
Subjects:
Acceptance criteria
Indicators
Mathematical and Computational Physics
Monte Carlo simulation
Photon beams
Photons
Physics
Physics and Astronomy
Radiation therapy
Simulation
Theoretical
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Summary:In radiotherapy applications, Monte Carlo (MC) simulation for dose calculations is well acknowledged for its accuracy in predicting dose deposition in the patient. The full modeling of a high-energy photon beam from Varian Clinac 2100C 18 MV medical linear accelerator is presented here by using the GATE/GEANT4 Monte Carlo codes. To evaluate dose distributions associated with the simulated linac head model, dosimetric quantities including the Percentage Depth Dose (PDD), transverse dose profiles, and a set of beam-quality indicators were measured and calculated in a water phantom for square field sizes of cm and cm . Simulations accuracy was validated through Gamma Index analysis using different acceptance criteria within 2 2 mm, 3 2 mm, 2 3 mm, and 3 3 mm. In terms of Gamma Index comparison, good agreements were found between the calculated and measured dose distributions for all field sizes. The differences between simulation and measurement of beam quality indicators were smaller than 2 .
ISSN:0027-1349
1934-8460
DOI:10.3103/S0027134921010069