Dosimetric performance of a multipoint plastic scintillator dosimeter as a tool for real-time source tracking in high dose rate
HDR brachytherapy
in vivo dosimetry
multipoint plastic scintillator detector
plastic scintillator
source tracking
Journal
Medical physics
ISSN: 2473-4209
Titre abrégé: Med Phys
Pays: United States
ID NLM: 0425746
Informations de publication
Date de publication:
Sep 2020
Sep 2020
Historique:
received:
25
10
2019
revised:
03
04
2020
accepted:
11
05
2020
pubmed:
23
5
2020
medline:
15
5
2021
entrez:
23
5
2020
Statut:
ppublish
Résumé
This study aims to present the performance of a multipoint plastic scintillation detector (mPSD) as a tool for real-time dose measurements (covering three orders of magnitude in dose rate), source-position triangulation, and dwell time assessment in high dose rate (HDR) brachytherapy. A previously characterized and optimized three-point sensor system was used for HDR brachytherapy measurements. The detector was composed of three scintillators: BCF60, BCF12, and BCF10. Scintillation light was transmitted through a single 1-mm-diameter clear optical fiber and read by a compact assembly of photomultiplier tubes (PMTs). Each component was numerically optimized to allow for signal deconvolution using a multispectral approach, taking care of the Cerenkov stem effect as well as extracting the dose from each scintillator. The PMTs were read simultaneously using a data acquisition board at a rate of 100 KHz and controlled with in-house software based on Python. An As expected, the positioning uncertainty dominated close to the source, whereas the measurement uncertainty dominated at larger distances. A maximum measurement uncertainty of 17 % was observed for the BCF60 scintillator at 10 cm from the source. Based on the uncertainty chain, the best compromises between positioning and measurement uncertainties were reached at 17.2, 17.4, and 17.5 mm for the BCF10, BCF12, and BCF60 scintillators, respectively, which also corresponded to the recommended optimal distances to the source for calibration purposes. The detector further exhibited no angular dependence. All dose values were found to be within 2% of the dose value at Real-time HDR brachytherapy measurements were performed with an optimized mPSD system. The performance of the system demonstrated that it could be used for simultaneous, in vivo, real-time reporting of dose, dwell time, and source position during HDR brachytherapy.
Substances chimiques
Plastics
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
4477-4490Subventions
Organisme : National Sciences and Engineering Research Council of Canada
Organisme : NSERC-Elekta Industrial Research Chair
ID : 484144-15
Organisme : NSERC-Elekta Industrial Research Chair
ID : RGPIN-2019-05038
Organisme : Canadian Foundation for Innovation
Organisme : JR Evans Leader Funds
ID : 35633
Organisme : Fonds de Recherche du Quebec - Nature et Technologies
Organisme : CREATE Medical Physics Research Training Network
Organisme : Natural Sciences and Engineering Research Council of Canada
ID : 432290
Informations de copyright
© 2020 American Association of Physicists in Medicine.
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