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A prototype MR insertable brain PET using tileable GAPD arrays.

Key Jo Hong1, Yong Choi, Jin Ho Jung

  • 1Department of Electronic Engineering, Sogang University, 1 Shinsu-Dong, Mapo-Gu, Seoul 121-742, South Korea.

Medical Physics
|April 6, 2013
PubMed
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This study developed an MR-compatible PET scanner for simultaneous brain imaging. Initial results show feasible simultaneous PET/MR imaging with good phantom resolution and minimal image artifacts.

Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Biophysics

Background:

  • Simultaneous positron emission tomography (PET) and magnetic resonance imaging (MRI) offers complementary molecular and anatomical information.
  • Integrating PET detectors within an MRI environment presents significant technical challenges due to electromagnetic interference and space constraints.

Purpose of the Study:

  • To develop and evaluate a prototype MR-compatible PET system insertable into a 3-Tesla MRI scanner for simultaneous brain imaging.
  • To assess the performance of novel Geiger-mode avalanche photodiode (GAPD)-based PET detectors within an MRI environment.

Main Methods:

  • A ring of 72 PET detector modules, each with lutetium yttrium orthosilicate (LYSO) crystals and GAPD detectors, was constructed and installed within a 3-T MRI.
  • Long flexible flat cables and a high-multiplexing ratio decoder circuit were used to position electronics outside the MR bore.

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  • Detector performance and MR image quality were evaluated both inside and outside the MRI scanner.

    • Main Results:

    • PET detector performance showed no significant degradation in energy resolution or count rates within the MRI environment; timing resolution slightly increased from 4.2 to 4.6 ns.
    • Simultaneous PET/MR imaging of phantoms demonstrated resolution of 3.5 mm rods and accurate mapping of white and gray matter activity.
    • Simultaneously acquired MR images showed phantoms without noticeable artifacts, though image quality requires further optimization.

    Conclusions:

    • The developed MR-compatible PET system enables feasible simultaneous PET and MRI acquisition of the brain.
    • This technology holds promise for advancing multimodal neuroimaging research and clinical applications.