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http://dx.doi.org/10.17946/JRST.2016.39.4.12

Monte Carlo Simulation of a Varian 21EX Clinac 6 MV Photon Beam Characteristics Using GATE6  

An, Jung-Su (Korea Atomic Energy Research Institute,Nonproliferation System Research Division)
Lee, Chang-Lae (Center for Radiological Environment & Health Science)
Baek, Cheol-Ha (Department of Radiological Science, College of Health Science, Yonsei University)
Publication Information
Journal of radiological science and technology / v.39, no.4, 2016 , pp. 571-575 More about this Journal
Abstract
Monte Carlo simulations are widely used as the most accurate technique for dose calculation in radiation therapy. In this paper, the GATE6(Geant4 Application for Tomographic Emission ver.6) code was employed to calculate the dosimetric performance of the photon beams from a linear accelerator(LINAC). The treatment head of a Varian 21EX Clinac was modeled including the major geometric structures within the beam path such as a target, a primary collimator, a flattening filter, a ion chamber, and jaws. The 6 MV photon spectra were characterized in a standard $10{\times}10cm^2$ field at 100 cm source-to-surface distance(SSD) and subsequent dose estimations were made in a water phantom. The measurements of percentage depth dose and dose profiles were performed with 3D water phantom and the simulated data was compared to measured reference data. The simulated results agreed very well with the measured data. It has been found that the GATE6 code is an effective tool for dose optimization in radiotherapy applications.
Keywords
Radiation Therapy; GATE; Linear accelerator; PDD;
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