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Evaluation and clinical implementation of in vivo dosimetry for kV radiotherapy using radiochromic film and micro-silica bead thermoluminescent detectors

Palmer, A, Jafari, Shakardokht, Mone, I and Muscat, S (2017) Evaluation and clinical implementation of in vivo dosimetry for kV radiotherapy using radiochromic film and micro-silica bead thermoluminescent detectors Physica Medica, 42. pp. 47-54.

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Abstract

Purpose: kV radiotherapy treatment calculations are based on flat, homogenous, full-scatter reference conditions. However, clinical treatments often include surface irregularities and inhomogeneities, causing uncertainty. Therefore, confirmation of actual delivered doses in vivo is valuable. The current study evaluates, and implements, radiochromic film and micro silica bead TLD for in vivo kV dosimetry. Methods: The kV energy and dose response of EBT3 film and silica bead TLD was established and uncertainty budgets determined. In vivo dosimetry measurements were made for a consecutive series of 30 patients using the two dosimetry systems. Results: Energy dependent calibration factors were required for both dosimetry systems. The standard uncertainty estimate for in vivo measurement with film was 1.7% and for beads was 1.5%. The mean measured dose was �2.1% for film and �2.6% for beads compared to prescription. Deviations up to �9% were found in cases of large surface irregularity, or with underlying air cavities or bone. Dose shielding by beads could be clinically relevant at low kV energies and superficial depths. Conclusions: Both film and beads may be used to provide in vivo verification of delivered doses in kV radiotherapy, particularly for complex situations that are not well represented by standard reference condition calculations

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences
Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Palmer, A
Jafari, Shakardokhtshakardokht.jafari@surrey.ac.uk
Mone, I
Muscat, S
Date : 4 September 2017
DOI : 10.1016/j.ejmp.2017.08.009
Copyright Disclaimer : Copyright 2017 Associazione Italiana di Fisica Medica
Uncontrolled Keywords : kV; In vivo; Film; Silica bead
Depositing User : Diane Maxfield
Date Deposited : 24 May 2018 09:04
Last Modified : 16 Jan 2019 19:10
URI: http://epubs.surrey.ac.uk/id/eprint/846499

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