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Feasibility Study of Source Position Verification in HDR Brachytherapy Using a Scintillating Fiber

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S Moon

S Moon1, E Jeang2 , Y Lim2 , D Shin2 , M Yoon1* , (1) Korea University, Seoul, Korea, (2) National Cancer Center, Goyang-si, Korea,


SU-I-GPD-T-12 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: Position verification of radiation source is a critical factor determining the therapeutic efficiency in brachytherapy. Currently, films are used to verify the source position, but this method is encumbered by the time requirement from scanning to analysis, which makes real-time position verification difficult. Source position accuracy is usually tested in a monthly quality assurance check. This study investigates the feasibility of real-time position verification in high-dose-rate (HDR) brachytherapy using scintillating fibers.

Methods: To this end, we built a system consisting of scintillating fibers and SiPM, optimized the dosimetric software setup and radiation system characteristics to obtain maximum measurement accuracy, and determined the relative ratio of the measured signals dependent upon the position of the scintillating fiber.

Results: According to the dosimetric results based on a treatment plan, in which the dwell time was set at 30 and 60 seconds from two dwell positions, the number of the signals was 31.5 and 83, respectively. In other words, the signal rate doubled in proportion to the dwell time. The source position could also be confirmed at the same time.

Conclusion: If spatial resolution and scintillating fiber array can be improved in the future, source position will be able to be verified in real-time in clinical settings, using a scintillating fiber-based system.

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