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

Stefan Van Der Sar*, Stefan Brunner, Dennis Schaart

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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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.

Original languageEnglish
Number of pages8
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume12031
DOIs
Publication statusPublished - 2022
EventMedical Imaging 2022: Physics of Medical Imaging - Virtual, Online
Duration: 21 Mar 202227 Mar 2022

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • count rate performance
  • energy response
  • scintillator
  • silicon photomultiplier (SiPM)
  • X-ray photon-counting

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