X-ray photon-counting using silicon photomultiplier-based scintillation detectors at high x-ray tube currents

Journal article (2022)

Authors

S.J. van der Sar RST/Medical Physics & Technology - AS
Stefan Brunner Broadcom Inc., Regensburg
Dennis Schaart RST/Medical Physics & Technology - AS , HollandPTC
Research Group
RST/Medical Physics & Technology (AS) (TU Delft)
Copyright: © 2022 S.J. van der Sar, Stefan Brunner, D.R. Schaart
DOI: https://doi.org/10.1117/12.2611365
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Published Date

2022

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Medical Physics & Technology

Abstract

We investigate X-ray photon-counting scintillation detectors with silicon photomultiplier (SiPM) readout. These circumvent some drawbacks of direct-conversion detectors. We measured observed count rate (OCR) versus X-ray tube current for single-pixel detectors consisting of LYSO:Ce and YAP:Ce scintillators coupled to ultrafast SiPMs. For a 30 keV threshold, the maximum OCRs equal 4.5 Mcps/pixel (LYSO:Ce) and 5.5 Mcps/pixel (YAP:Ce) for paralyzable-like counting and 10 Mcps/pixel (LYSO:Ce) and 12.5 Mcps/pixel (YAP:Ce) for nonparalyzable-like counting. We estimate that the twice as fast LaBr3:Ce scintillator yields OCRs approaching those of CdTe/CZT-based photon-counting CT detectors. We also show energy response data and discuss dose-efficient pixel miniaturization.

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