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Related Experiment Video

Updated: Jun 7, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera

Published on: January 30, 2020

An enhanced high-resolution EMCCD-based gamma camera using SiPM side detection.

J W T Heemskerk1, M A N Korevaar, J Huizenga

  • 1Department of Nuclear Medicine, Image Sciences Institute, University Medical Center Utrecht, Universiteitsweg 100, 3584 CG, Utrecht, The Netherlands.

Physics in Medicine and Biology
|October 30, 2010
PubMed
Summary
This summary is machine-generated.

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This study introduces a hybrid gamma camera using silicon photon-multipliers (SiPMs) and electron-multiplying charge-coupled devices (EMCCDs) to reduce noise and improve imaging. The novel system enhances gamma ray detection and image quality for medical applications.

Area of Science:

  • Medical Imaging
  • Nuclear Physics
  • Photon Detection

Background:

  • Electron-multiplying charge-coupled devices (EMCCDs) with scintillation crystals offer high-resolution gamma ray imaging.
  • EMCCD noise introduces false events, degrading spatial/energy resolution and image quality.
  • Escaping scintillation photons are typically neglected, missing valuable detection information.

Purpose of the Study:

  • To improve the performance of EMCCD-based gamma cameras by incorporating silicon photon-multipliers (SiPMs).
  • To utilize detected escaping photons for a priori knowledge of gamma interactions.
  • To develop a hybrid SiPM-EMCCD system for enhanced gamma camera capabilities.

Main Methods:

  • A gamma camera with a back-illuminated EMCCD and a monolithic CsI:Tl crystal was used.

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Last Updated: Jun 7, 2026

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  • Arrays of twelve SiPMs were mounted on the sides of the CsI:Tl crystal.
  • SiPM data was used as an additional criterion to select valid scintillation events in the EMCCD images.

    • Main Results:

    • Using SiPM information reduced the background noise level for (99m)Tc by a factor of 2.
    • The hybrid system enabled the detection of (125)I scintillations.
    • Improved event selection criteria led to a cleaner reconstructed image.

    Conclusions:

    • Hybrid SiPM-EMCCD gamma cameras significantly reduce background noise and improve event detection.
    • This technology enhances spatial and energy resolution in gamma imaging.
    • The system shows great potential for in vivo imaging of gamma emitters in medical diagnostics.