δείτε την πρωτότυπη σελίδα τεκμηρίου στον ιστότοπο του αποθετηρίου του φορέα για περισσότερες πληροφορίες και για να δείτε όλα τα ψηφιακά αρχεία του τεκμηρίου*
Application of the Monte Carlo integration (MCI) method for calculation of the anisotropy of 192Ir brachytherapy sources
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Kolotas, C
(EN)
Giannouli, S
(EN)
Baltas, D
(EN)
Garbi, A
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Ioannidis, GT
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Diakonos, F
(EN)
Geramani, K
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Tsalpatouros, A
(EN)
Zamboglou, N
(EN)
Uzunoglu, N
(EN)
Source anisotropy is a very important factor in the brachytherapy quality assurance of high-dose rate (HDR) Ir-192 afterloading stepping sources. If anisotropy is not taken into account then doses received by a brachytherapy patient in certain directions can be in error by a clinically significant amount. Experimental measurements of anisotropy are very labour intensive. We have shown that within acceptable limits of accuracy, Monte Carlo integration (MCI) of a modified Sievert integral (3D generalization) can provide the necessary data within a much shorter time scale than can experiments. Hence MCI can be used for routine quality assurance schedules whenever a new design of HDR or PDR Ir-192 is used for brachytherapy afterloading. Our MCI calculation results are compared with published experimental data and Monte Carlo simulation data for microSelectron and VariSource Ir-192 sources. We have shown not only that MCI offers advantages over alternative numerical integration methods, but also that treating filtration coefficients as radial distance-dependent functions improves Sievert integral accuracy at low energies. This paper also provides anisotropy data for three new Ir-192 sources, one for the microSelectron-HDR and two for the microSelectron-PDR, for which data are currently not available. The information we have obtained in this study can be incorporated into clinical practice.
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journalArticle
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Models, Theoretical
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Radiotherapy Dosage
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dosimetry
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Engineering, Biomedical
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Humans
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anisotropy
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iridium 192
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mathematical analysis
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Biophysics
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Iridium Radioisotopes
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article
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Neoplasms
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system analysis
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Algorithms
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Radiology, Nuclear Medicine & Medical Imaging
(EN)
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.
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