alexa Abstract | A Simple and Light-weight Phantom Designing for the Quality Audit of Radiotherapy Techniques by Megavoltage Linacs

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Research Article Open Access

Abstract

The aim of this study was to design a small phantom and evaluate its functionality for determining the accuracy and performance of megavoltage radiotherapy machines through an external quality audit. A small phantom was designed to check the photon beams at the reference and some non-reference conditions on a linac at three radiotherapy centers in Tehran. LiF TLDs were used for experimental dosimetry. A standard phantom with an ionization chamber and the Monte Carlo code were used to calculate the conversion factor of the doses in the small phantom to the conventional condition. At the reference condition, the amount of deviation between the measured and calculated doses for the radiotherapy center of A, B and C were -1.7, 5.8 and -1.4 percent at 6MV and -5.3, 6.8 and 0.6 percent at 18MV respectively. The deviations obtained at various non reference conditions ranged from 4.3 to 11.9%. The functionality of the simple phantom with the TLDs was confirmed as an appropriate dosimetry system to carry out intercomparison among radiotherapy centers.

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Author(s): Seyed Mostafa G Hosein G

Keywords

Monte Carlo, Plexiglas phantom, Quality audit, Radiotherapy, Reference condition, Biomedical Physics, Computed Tomography, Diagnostic and Interventional, Radiology Physics, Fluoroscopy, Healthcare, Health Physics, Mammography, Medical Physics, Nuclear Medicine Physics, Radiation Oncology, Radiation, Protection, Radiation Safety, Therapeutic Physics, X-Rays

 
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