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Electrical delay line multiplexing for pulsed mode radiation detectors.

Ruud Vinke1, Jung Yeol Yeom, Craig S Levin

  • 1Department of Radiology, Stanford University, Stanford, CA 94305, USA.

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|March 14, 2015
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Summary

This study introduces an electrical delay line multiplexing scheme to reduce data acquisition channels in medical imaging systems like Positron Emission Tomography (PET). The method effectively identifies individual crystals while minimally impacting timing resolution, reducing cost and complexity.

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Area of Science:

  • Medical Physics
  • Instrumentation
  • Nuclear Medicine

Background:

  • Medical imaging systems, particularly Positron Emission Tomography (PET), utilize numerous position-sensitive radiation detectors.
  • Reducing the number of data acquisition channels is crucial for lowering system cost and complexity in PET scanners.

Purpose of the Study:

  • To present an electrical delay line multiplexing scheme for reducing readout channels in PET systems.
  • To evaluate the scheme's effectiveness in preserving signal integrity and timing resolution.

Main Methods:

  • Experimentation with 4x4 LYSO crystal arrays (3x3x5 mm and 3x3x20 mm) coupled to 16 Silicon Photomultiplier (SiPM) elements.
  • Implementation of an electrical delay line multiplexing to combine multiple SiPM signals into a single channel.
  • Measurement of coincidence timing resolution before and after multiplexing.

Main Results:

  • Accurate identification of individual crystals was achieved, despite scintillation light sharing and inter-crystal Compton scatter.
  • A slight degradation in coincidence timing resolution was observed, from ~243 ps FWHM to ~272 ps FWHM for the 3x3x20 mm array.
  • The multiplexing scheme demonstrated flexibility and scalability for various detector configurations.

Conclusions:

  • The electrical delay line multiplexing scheme significantly reduces data acquisition channels in PET systems.
  • The method maintains signal integrity, enabling accurate crystal identification with minimal impact on timing resolution.
  • This approach offers a cost-effective and scalable solution for advanced medical imaging detector systems.