Effect of photon energy spectrum on dosimetric parameters of brachytherapy sources

Ghorbani, M. and Mehrpouyan, M. and Davenport, D. and Ahmadi Moghaddas, T. (2016) Effect of photon energy spectrum on dosimetric parameters of brachytherapy sources. Radiology and Oncology, 50 (2). pp. 238-246.

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The aim of this study is to quantify the influence of the photon energy spectrum of brachytherapy sources on task group No. 43 (TG-43) dosimetric parameters. Different photon spectra are used for a specific radionuclide in Monte Carlo simulations of brachytherapy sources. MCNPX code was used to simulate 125I, 103Pd, 169Yb, and 192Ir brachytherapy sources. Air kerma strength per activity, dose rate constant, radial dose function, and two dimensional (2D) anisotropy functions were calculated and isodose curves were plotted for three different photon energy spectra. The references for photon energy spectra were: published papers, Lawrence Berkeley National Laboratory (LBNL), and National Nuclear Data Center (NNDC). The data calculated by these photon energy spectra were compared. Dose rate constant values showed a maximum difference of 24.07 for 103Pd source with different photon energy spectra. Radial dose function values based on different spectra were relatively the same. 2D anisotropy function values showed minor differences in most of distances and angles. There was not any detectable difference between the isodose contours. Dosimetric parameters obtained with different photon spectra were relatively the same, however it is suggested that more accurate and updated photon energy spectra be used in Monte Carlo simulations. This would allow for calculation of reliable dosimetric data for source modeling and calculation in brachytherapy treatment planning systems. © 2016 Radiol Oncol.

Item Type: Article
Additional Information: Cited By :2 Export Date: 16 February 2020 CODEN: RONCE Correspondence Address: Mehrpouyan, M.; Bioinformatics Research Center, Sabzevar University of Medical SciencesIran; email: mehrpouyan.mohammad@gmail.com
Uncontrolled Keywords: brachytherapy dose distribution photon energy spectrum TG-43 dosimetric parameters iodine 125 iridium 192 palladium 103 radioisotope unclassified drug ytterbium 169 anisotropy Article controlled study dosimetry energy energy absorption Monte Carlo method photon radioisotope therapy rate constant
Subjects: WN Radiology . Diagnostic Imaging
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib4 lib4
Date Deposited: 02 Mar 2020 07:50
Last Modified: 02 Mar 2020 07:50
URI: http://eprints.mums.ac.ir/id/eprint/13009

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