NDLI: Characterization of a Low-Cost Plastic Fiber Array Detector for Proton Beam Dosimetry

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Characterization of a Low-Cost Plastic Fiber Array Detector for Proton Beam Dosimetry

Content Provider	MDPI
Author	Loch, Cigdem Ozkan Eichenberger, Michael Alexander Togno, Michele Zinsli, Simon Pascal Egloff, Martina Papa, Angela Ischebeck, Rasmus Lomax, Antony John Peier, Peter Safai, Sairos
Copyright Year	2020
Description	The Pencil Beam Scanning (PBS) technique in proton therapy uses fast magnets to scan the tumor volume rapidly. Changing the proton energy allows changing to layers in the third dimension, hence scanning the same volume several times. The PBS approach permits adapting the speed and/or current to modulate the delivered dose. We built a simple prototype that measures the dose distribution in a single step. The active detection material consists of a single layer of scintillating fibers (i.e., 1D) with an active length of 100 mm, a width of 18.25 mm, and an insignificant space (20 $μ$ m) between them. A commercial CMOS-based camera detects the scintillation light. Short exposure times allow running the camera at high frame rates, thus, monitoring the beam motion. A simple image processing method extracts the dose information from each fiber of the array. The prototype would allow scaling the concept to multiple layers read out by the same camera, such that the costs do not scale with the dimensions of the fiber array. Presented here are the characteristics of the prototype, studied under two modalities: spatial resolution, linearity, and energy dependence, characterized at the Center for Proton Therapy (Paul Scherrer Institute); the dose rate response, measured at an electron accelerator (Swiss Federal Institute of Metrology).
Starting Page	5727
e-ISSN	14248220
DOI	10.3390/s20205727
Journal	Sensors
Issue Number	20
Volume Number	20
Language	English
Publisher	MDPI
Publisher Date	2020-10-09
Access Restriction	Open
Subject Keyword	Sensors Nuclear Energy and Engineering Scintillator Fiber Protons Electrons Beam Monitoring Dosimeter
Content Type	Text
Resource Type	Article

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