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Real-time beam monitoring for error detection in IMRT plans and impact on dose-volume histograms

Real-time beam monitoring for error detection in IMRT plans and impact on dose-volume histograms Purpose This study aimed to test the sensitivity of a transmission detector for online dose monitoring of intensity-modu- lated radiation therapy (IMRT) for detecting small delivery errors. Furthermore, the correlation of changes in detector output induced by small delivery errors with other metrics commonly employed to quantify the deviations between calculated and delivered dose distributions was investigated. Methods Transmission detector measurements were performed at three institutions. Seven types of errors were induced in nine clinical step-and-shoot (S&S) IMRT plans by modifying the number of monitor units (MU) and introducing small deviations in leaf positions. Signal reproducibility was investigated for short- and long-term stability. Calculated dose distributions were compared in terms of γ passing rates and dose–volume histogram (DVH) metrics (e.g., D ,D ,V ). mean x% x% The correlation between detector signal variations, γ passing rates, and DVH parameters was investigated. Results Both short- and long-term reproducibility was within 1%. Dose variations down to 1 MU (signal 1.1 ± 0.4%) as well as changes in field size and positions down to 1 mm (signal 2.6 ± 1.0%) were detected, thus indicating high error-detection sensitivity. A moderate correlation of detector signal was observed with γ passing rates (R = 0.57–0.70), http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strahlentherapie und Onkologie Springer Journals

Real-time beam monitoring for error detection in IMRT plans and impact on dose-volume histograms

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References (10)

Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Medicine & Public Health; Radiotherapy; Oncology
ISSN
0179-7158
eISSN
1439-099X
DOI
10.1007/s00066-017-1245-3
pmid
29255923
Publisher site
See Article on Publisher Site

Abstract

Purpose This study aimed to test the sensitivity of a transmission detector for online dose monitoring of intensity-modu- lated radiation therapy (IMRT) for detecting small delivery errors. Furthermore, the correlation of changes in detector output induced by small delivery errors with other metrics commonly employed to quantify the deviations between calculated and delivered dose distributions was investigated. Methods Transmission detector measurements were performed at three institutions. Seven types of errors were induced in nine clinical step-and-shoot (S&S) IMRT plans by modifying the number of monitor units (MU) and introducing small deviations in leaf positions. Signal reproducibility was investigated for short- and long-term stability. Calculated dose distributions were compared in terms of γ passing rates and dose–volume histogram (DVH) metrics (e.g., D ,D ,V ). mean x% x% The correlation between detector signal variations, γ passing rates, and DVH parameters was investigated. Results Both short- and long-term reproducibility was within 1%. Dose variations down to 1 MU (signal 1.1 ± 0.4%) as well as changes in field size and positions down to 1 mm (signal 2.6 ± 1.0%) were detected, thus indicating high error-detection sensitivity. A moderate correlation of detector signal was observed with γ passing rates (R = 0.57–0.70),

Journal

Strahlentherapie und Onkologie – Springer Journals

Published: Dec 18, 2017

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