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A time-based single transmission-line readout with position multiplexing.

Minseok Yi1,2,3, Jae Sung Lee1,2,3,4,5

  • 1Interdisciplinary Program in Bioengineering, Seoul National University College of Engineering, Seoul, 03080 South Korea.

Biomedical Engineering Letters
|February 21, 2022
PubMed
Summary
This summary is machine-generated.

A new time-based readout method for time-of-flight positron emission tomography (PET) detectors encodes 2D position using pulse widths. This significantly reduces data acquisition channels, improving PET system efficiency.

Keywords:
Depth-of-interactionPosition multiplexingSiPM (silicon photomultiplier)TOF-PET

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Area of Science:

  • Medical Imaging
  • Nuclear Physics
  • Detector Technology

Background:

  • Traditional Positron Emission Tomography (PET) systems face challenges with complex data acquisition due to the high number of detector channels.
  • Existing position-sensitive detector readout methods, like charge-sharing, can be resource-intensive.
  • Improving detector channel efficiency is crucial for advancing PET technology.

Purpose of the Study:

  • To develop a novel time-based single-transmission-line readout method for PET detectors.
  • To enable 3D gamma ray interaction position decoding through a single-channel readout.
  • To reduce the number of data acquisition channels in PET systems.

Main Methods:

  • A time-based single-transmission-line readout was developed for time-of-flight PET detectors.
  • A 4x4 array of LSO crystals coupled to a 4x4 silicon photomultiplier (SiPM) array was used.
  • 2D position was encoded using pulse widths of an L-shaped tag pulse, with signals summed and analyzed via timestamps.

Main Results:

  • The method successfully separated all 16 crystals on a positioning map.
  • Average energy resolution was 15.0 ± 1.1% and coincidence time resolution was 288.7 ± 29.3 ps.
  • Demonstrated 3D position decoding capability in a phoswich PET detector setup (LSO and LGSO).

Conclusions:

  • The developed method allows for time-based single-channel readout with 3D gamma ray interaction position decoding.
  • Scintillation signals are well-preserved, enabling effective discrimination in phoswich detectors.
  • This approach reduces data acquisition channels by 4-5 times, significantly decreasing the burden on PET systems.