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Analog signal multiplexing for PSAPD-based PET detectors: simulation and experimental validation.

Frances W Y Lau1, Arne Vandenbroucke, Paul D Reynolds

  • 1Department of Electrical Engineering, Stanford University, Stanford, CA, USA.

Physics in Medicine and Biology
|November 18, 2010
PubMed
Summary

A new detector multiplexing technique for positron emission tomography (PET) systems was developed. This method simplifies electronics and reduces board density without significantly impacting key performance metrics like energy and time resolution.

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Area of Science:

  • Medical Imaging
  • Nuclear Instrumentation
  • Detector Physics

Background:

  • Clinical positron emission tomography (PET) systems require high resolution for accurate imaging.
  • Developing compact and efficient detector electronics is crucial for advanced PET system design.
  • Position-sensitive avalanche photodiodes (PSAPDs) are key components in modern PET detectors.

Purpose of the Study:

  • To introduce and validate a detector multiplexing technique for a 1 mm³ resolution clinical PET system.
  • To assess the impact of multiplexing on readout electronics density and circuit board design.
  • To evaluate the performance of PSAPD-based detectors with and without the proposed multiplexing scheme.

Main Methods:

  • Development of a detector multiplexing technique for 4608 PSAPDs.

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  • Validation using a simulation framework modeling PSAPDs and front-end multiplexing circuits.
  • Experimental measurements of energy resolution, time resolution, crystal identification, and count rate with and without multiplexing.

    • Main Results:

    • The multiplexing technique successfully simplified readout electronics and reduced circuit board density.
    • No significant degradation in energy resolution, time resolution, or count rate was observed with multiplexing.
    • A minor degradation (6.9-9.4%) in crystal identification ability was noted in flood histogram analysis.

    Conclusions:

    • The proposed detector multiplexing technique is a viable approach for clinical PET systems.
    • This technique offers advantages in electronic simplification and board design without compromising major performance parameters.
    • Further optimization may be needed to fully mitigate the observed minor degradation in crystal identification.