Novel high resolution I brachytherapy source dosimetry using Ge-doped optical fibres

Issa, F, Nisbet, A, Bradley, DA and Hugtenburg, RP (2013) Novel high resolution I brachytherapy source dosimetry using Ge-doped optical fibres Radiation Physics and Chemistry, 92. pp. 48-53.

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Abstract

The steep dose gradients close to brachytherapy sources limit the ability to obtain accurate measurements of dose. Here we use a novel high spatial resolution dosimeter to measure dose around a I source and compare against simulations. Ge-doped optical fibres, used as thermoluminescent dosimeters, offer sub-mm spatial resolution, linear response from 10cGy to >1kGy and dose-rate independence. For a I brachytherapy seed in a PMMA phantom, doses were obtained for source-dosimeter separations from 0.1cm up to several cm, supported by EGSnrc/DOSRZznrc Monte Carlo simulations and treatment planning system data. The measurements agree with simulations to within 2.3%±0.3% along the transverse and perpendicular axes and within 3.0%±0.5% for measurements investigating anisotropy in angular dose distribution. Measured and Veriseed™ brachytherapy treatment planning system (TPS) values agreed to within 2.7%±0.5%.Ge-doped optical fibre dosimeters allow detailed dose mapping around brachytherapy sources, not least in situations of high dose gradient. © 2013 Elsevier Ltd.

Item Type:	Article
Authors :	Name Email ORCID Issa, F Nisbet, A Bradley, DA Hugtenburg, RP
Date :	November 2013
DOI :	10.1016/j.radphyschem.2013.06.005
Depositing User :	Symplectic Elements
Date Deposited :	28 Mar 2017 13:23
Last Modified :	31 Oct 2017 16:21
URI:	http://epubs.surrey.ac.uk/id/eprint/804004

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