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Development of brain PET using GAPD arrays.

Jin Ho Jung1, Yong Choi, Key Jo Hong

  • 1Department of Electronic Engineering, Sogang University, Mapo-Gu, Seoul, Korea.

Medical Physics
|March 3, 2012
PubMed
Summary
This summary is machine-generated.

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This study developed a novel positron emission tomography (PET) system using Geiger-mode avalanche photodiodes (GAPDs) for brain imaging. The new PET system demonstrates high-quality imaging capabilities, paving the way for advanced diagnostic tools.

Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Detector Physics

Background:

  • Geiger-mode avalanche photodiodes (GAPDs) offer advantages like high gain and magnetic field insensitivity for PET detectors.
  • Traditional PET systems face limitations that novel detector technologies aim to overcome.

Purpose of the Study:

  • To develop a novel positron emission tomography (PET) system specifically for brain imaging.
  • To leverage the benefits of Geiger-mode avalanche photodiodes (GAPDs) in a PET system design.

Main Methods:

  • Constructed a PET system with 72 detector modules, each featuring cerium-doped lutetium yttrium orthosilicate (LYSO) crystals coupled with a 4x4 GAPD array.
  • Utilized a position decoder circuit (PDC) and field-programmable gate array (FPGA)-embedded data acquisition (DAQ) boards for signal processing.

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  • Digitized analog signals to calculate arrival time and energy for stored data.

    • Main Results:

    • Achieved energy resolution of 18.4 ± 3.1% and coincidence timing resolution of 2.6 ns for 511 keV gamma rays.
    • Demonstrated a transaxial spatial resolution of 3.1 mm and sensitivity of 0.32% cps/Bq at the center of the field of view.
    • Successfully resolved 2.5 mm rods in phantom imaging and visualized activity distribution in a Hoffman brain phantom.

    Conclusions:

    • Experimental results confirm the feasibility of developing a PET system using GAPD arrays.
    • The developed GAPD-based PET system is capable of producing high-quality PET images.