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A Time-Walk and Timing-Shift Correction Method for Dual-Ended Readout TOF-DOI PET Detectors.

Haibo Wang1, Jiahao Xie1, Jinyi Qi1

  • 1Department of Biomedical Engineering, University of California at Davis, Davis, CA 95616 USA.

IEEE Transactions on Radiation and Plasma Medical Sciences
|October 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel correction method for time-walk and timing-shift in dual-ended readout Positron Emission Tomography (PET) detectors. The technique significantly improves coincidence time resolution, enhancing PET imaging performance.

Keywords:
DOIDual-Ended ReadoutPETTime-Walk CorrectionTiming-Shift Correction

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Area of Science:

  • Medical Imaging
  • Nuclear Physics
  • Instrumentation

Background:

  • Positron Emission Tomography (PET) detectors face timing inaccuracies like time-walk and timing-shift.
  • These issues stem from leading-edge discriminators and depth-of-interaction (DOI) effects in thick crystals.
  • Accurate timing is crucial for high-resolution PET imaging.

Purpose of the Study:

  • To develop and evaluate a combined correction method for time-walk and timing-shift in dual-ended readout PET detectors.
  • To improve the coincidence time resolution (CTR) of PET systems.
  • To enhance the overall performance and image quality of PET scanners.

Main Methods:

  • A novel combined time-walk and timing-shift correction algorithm was proposed.
  • Dual-ended readout PET detectors were constructed using silicon photomultiplier (SiPM) arrays and LYSO crystals.
  • The relationship between event energies and detected time differences was utilized for correction.
  • An energy window (400-650 keV) was applied to select valid events.

Main Results:

  • The proposed method effectively corrected for time-walk and timing-shift.
  • Coincidence time resolution improved from 260.7 ± 1.0 ps to 229.4 ± 1.0 ps.
  • The results demonstrate a significant enhancement in timing accuracy for the PET detectors.

Conclusions:

  • The developed correction method is effective for dual-ended readout PET detectors.
  • This technique offers a viable solution to improve timing resolution in PET imaging.
  • The findings contribute to the advancement of high-performance PET scanner technology.