A quality assurance tool for high-dose-rate brachytherapy

Medical Physics
Daniel W RickeyJeff Bews

Abstract

The purpose of this work was to develop a quality assurance (QA) tool for high-dose-rate (HDR) brachytherapy that would quickly and easily verify both source positioning (dwell positions) and durations (dwell times). The authors constructed a QA tool that combined radiochromic film to verify position with four photodiode detectors to verify dwell times. To characterize the temporal accuracy of the tool, a function generator powered four red light-emitting diodes that were optically coupled to the four photodiode detectors. The QA tool was used to verify the dwell positions and times of a commercial brachytherapy afterloader. Measurements of dwell time were independently verified by a one-dimensional optical camera that acquired 1000 lines/s. The temporal accuracy of the QA tool was found to be about 1 ms. For visual assessment, the source position could be located within about 0.5 mm. Evaluating the accuracy and precision of an HDR brachytherapy afterloader, the authors found that the bias in dwell time can exceed 60 ms and the dwell time associated with the first dwell position had an unexpectedly large standard deviation of 30 ms. They found that the source locations were much easier to locate on the film if a plastic cathete...Continue Reading

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Citations

Mar 24, 2016·Nihon Hoshasen Gijutsu Gakkai zasshi·Asako HiroseTeruki Teshima
Dec 5, 2013·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Christian KirisitsFrank-André Siebert
Feb 9, 2018·Journal of Applied Clinical Medical Physics·Normand Frenière
Feb 29, 2020·Scientific Reports·Katsunori YogoKazushige Hayakawa
Feb 19, 2011·Journal of Applied Clinical Medical Physics·Abdul Qadir JangdaZaka Rehman
Sep 30, 2020·Medical Physics·Azam Niroomand-RadMaria F Chan
Nov 3, 2020·Journal of Applied Clinical Medical Physics·Yu KumazakiShingo Kato
Nov 18, 2020·Physics in Medicine and Biology·Mengyu JiaBenjamin P Fahimian

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