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A Preliminary Study on a Real-time Dose Monitoring System Based on Scintillating Fibers for Brachytherapy

Authors
 Juhye Kim  ;  Jihye Koo  ;  Sang Hyoun Choi  ;  Soon Sung Lee  ;  Dong Wook Kim 
Citation
 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT , Vol.929 : 50-56, 2019 
Journal Title
 NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 
ISSN
 0168-9002 
Issue Date
2019
Keywords
Scintillating fibers ; Brachytherapy ; Real-time monitoring ; In-vivo dosimetry
Abstract
Purpose: We developed and evaluated a preliminary scintillating fiber-based real-time dose monitoring system (SRDMS) for brachytherapy. Materials and methods: The SRDMS consisted of a detector section with 10 scintillating fibers (BCF-12, Saint Gobain Inc., S.A. France) inserted into a long barrel cylinder and a readout system comprising a photo-multiplier tube (PMT H12428-203 MOD, Hamamatsu Photonics, Shizuoka, Japan) and National Instrument Measurement & Automation Explorer (NI MAX, National Instruments, TX, USA). Basic system performance was estimated by measuring the dwell position and time for various patterns of source motion. Signal output response with data sampling, linearity, and reproducibility was also evaluated. In addition, dwell position and time measurement via the SRDMS were compared across three treatment plans, which were applied to a silicone-based human phantom to evaluate the system’s response to more complex and realistic situations. Results: The difference between the measured source dwell position and plan was -0.52 ± 0.53 mm. The difference between the measured dwell time and plan was 7 ± 5 ms. For signal output verification, the signal-to-SD ratio was less than 1.5%. The signal output linearity was maintained at -0.43 ± 0.50%, and reproducibility was 1.35 ± 1.44%. Conclusions: In this study, we demonstrated that the SRDMS can accurately detect relative dwell positions and dwell times. In further studies, we plan to verify the accuracy of relative source strength, and update the SRDMS with real-time monitoring. The SRDMS could be used for real-time dose monitoring during brachytherapy.
Full Text
https://www.sciencedirect.com/science/article/pii/S0168900219303390
DOI
10.1016/j.nima.2019.03.031
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Kim, Dong Wook(김동욱) ORCID logo https://orcid.org/0000-0002-5819-9783
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/169541
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