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Improved Edge Pixel Resolution in Modular PET Detectors with Partly Segmented Light Guides.

Henry Maa-Hacquoil1, Harutyun Poladyan1, Brandon Baldassi2

  • 1Department of Physics, Lakehead University, Thunder Bay, ON P7B 5E1, Canada.

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|November 27, 2025
PubMed
Summary
This summary is machine-generated.

Partly segmented light guides significantly improve Positron Emission Tomography (PET) sensor accuracy by reducing optical photon spread, mitigating the "edge effect" for better image quality.

Keywords:
detectorslight guideorgan-targeted PETpartly segmented light guide

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Area of Science:

  • Medical Imaging Physics
  • Instrumentation Science

Background:

  • Positron Emission Tomography (PET) sensor modules exhibit an "edge effect" due to asymmetric optical photon distribution near module edges.
  • This effect causes errors in scintillation event coordinate reconstruction using center-of-gravity (CoG) algorithms, leading to overlapping signatures and image artifacts.

Purpose of the Study:

  • To mitigate the PET "edge effect" and improve coordinate reconstruction accuracy.
  • To evaluate the efficacy of partly segmented light guides in addressing photon spread.

Main Methods:

  • Utilized partly segmented borosilicate light guides filled with barium sulfate to confine optical photons.
  • Performed data acquisition using single PET sensor modules in coincidence with single and multiplexed channel readout.
  • Employed center-of-gravity (CoG) and truncated center-of-gravity (TCoG) methods for coordinate reconstruction.

Main Results:

  • Partly segmented light guides enabled distinguishing 24 × 24 crystal arrays, compared to 22 × 22 with solid guides.
  • Truncated center-of-gravity (TCoG) further enhanced pixel resolution at flood map edges and corners.
  • Improved coordinate reconstruction accuracy and crystal flood map quality were observed.

Conclusions:

  • Partly segmented light guides substantially enhance coordinate reconstruction accuracy at PET sensor module edges.
  • This method can be combined with other techniques like TCoG for synergistic improvements in accuracy and flood map quality.