open access

Vol 19, No 5 (2014)
Original research articles
Published online: 2014-09-01
Submitted: 2012-04-04
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A Monte Carlo evaluation for effects of probable dimensional uncertainties of low dose rate brachytherapy seeds on dose

Berkay Camgöz, Mehmet N. Kumru
DOI: 10.1016/j.rpor.2014.01.001
·
Rep Pract Oncol Radiother 2014;19(5):301-309.

open access

Vol 19, No 5 (2014)
Original research articles
Published online: 2014-09-01
Submitted: 2012-04-04

Abstract

The aim of this study is to determine effects of size deviations of brachytherapy seeds on two dimensional dose distributions around the seed. Although many uncertainties are well known, the uncertainties which stem from geometric features of radiation sources are weakly considered and predicted. Neither TG-43 report which is not completely in common consensus, nor individual scientific MC and experimental studies include sufficient data for geometric uncertainties. Sizes of seed and its components can vary in a manufacturing deviation. This causes geometrical uncertainties, too. In this study, three seeds which have different geometrical properties were modeled using EGSnrc-Code Packages. Seeds were designed with all their details using the geometry package. 5% deviations of seed sizes were assumed. Modified seeds were derived from original seed by changing sizes by 5%. Normalizations of doses which were calculated from three kinds of brachytherapy seed and their derivations were found to be about 3%–20%. It was shown that manufacturing differences of brachytherapy seed cause considerable changes in dose distribution.

Abstract

The aim of this study is to determine effects of size deviations of brachytherapy seeds on two dimensional dose distributions around the seed. Although many uncertainties are well known, the uncertainties which stem from geometric features of radiation sources are weakly considered and predicted. Neither TG-43 report which is not completely in common consensus, nor individual scientific MC and experimental studies include sufficient data for geometric uncertainties. Sizes of seed and its components can vary in a manufacturing deviation. This causes geometrical uncertainties, too. In this study, three seeds which have different geometrical properties were modeled using EGSnrc-Code Packages. Seeds were designed with all their details using the geometry package. 5% deviations of seed sizes were assumed. Modified seeds were derived from original seed by changing sizes by 5%. Normalizations of doses which were calculated from three kinds of brachytherapy seed and their derivations were found to be about 3%–20%. It was shown that manufacturing differences of brachytherapy seed cause considerable changes in dose distribution.

Get Citation

Keywords

Brachytherapy; Dose; TG-43 report; Monte Carlo; EGSnrc

About this article
Title

A Monte Carlo evaluation for effects of probable dimensional uncertainties of low dose rate brachytherapy seeds on dose

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 19, No 5 (2014)

Pages

301-309

Published online

2014-09-01

DOI

10.1016/j.rpor.2014.01.001

Bibliographic record

Rep Pract Oncol Radiother 2014;19(5):301-309.

Keywords

Brachytherapy
Dose
TG-43 report
Monte Carlo
EGSnrc

Authors

Berkay Camgöz
Mehmet N. Kumru

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