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http://dx.doi.org/10.17946/JRST.2020.43.6.443

Evaluation of Absorbed Dose for the Right Lung and Surrounding Organs of the Computational Human Phantom in Brachytherapy by Monte Carlo Simulation  

Lee, Jun-Seong (Department of Radiation Oncology, Jeonbuk National University Hospital)
Kim, Yang-Soo (Department of Radiation Oncology, Jeonbuk National University Hospital)
Kim, Min-Gul (Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital)
Kim, Jung-Soo (Department of Radiation Oncology, Institute for Medical Sciences, Jeonbuk National University Medical School)
Lee, Sun-Young (Department of Radiation Oncology, Institute for Medical Sciences, Jeonbuk National University Medical School)
Publication Information
Journal of radiological science and technology / v.43, no.6, 2020 , pp. 443-451 More about this Journal
Abstract
This study is to evaluate absorbed dose from right lung for brachytherapy and to estimate the effects of tissue heterogeneities on dose distribution for Iridium-192 source using Monte Carlo simulation. The study employed Geant4 code as Monte Carlo simulation to calculate the dosimetry parameters. The dose distribution of Iridium-192 source in solid water equivalent phantom including aluminium plate or steel plate inserted was calculated and compared with the measured dose by the ion chamber at various distances. And the simulation was used to evaluate the dose of gamma radiation absorbed in the lung organ and other organs around it. The dose distribution embedded in right lung was calculated due to the presence of heart, thymus, spine, stomach as well as left lung. The geometry of the human body was made up of adult male MIRD type of the computational human phantom. The dosimetric characteristics obtained for aluminium plate inserted were in good agreement with experimental results within 4%. The simulation results of steel plate inserted agreed well with a maximum difference 2.75%. Target organ considered to receive a dose of 100%, the surrounding organs were left the left lung of 3.93%, heart of 10.04%, thymus of 11.19%, spine of 12.64% and stomach of 0.95%. When the statistical error is performed for the computational human phantom, the statistical error of value is under 1%.
Keywords
Monte Carlo simulation; Computational human phantom; Dosimetry; Brachytherapy; Iridium-192 source;
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