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Related Experiment Video

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Simultaneous fMRI and Electrophysiology in the Rodent Brain
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PETcoil: first results from a second-generation RF-penetrable TOF-PET brain insert for simultaneous PET/MRI.

Qian Dong1, Muhammad Nasir Ullah1, Derek Innes1

  • 1Molecular Imaging Instrumentation Laboratory, Department of Radiology, Stanford University, Stanford, CA, United States of America.

Physics in Medicine and Biology
|August 21, 2024
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Summary

This study introduces a new MR-compatible PET insert with improved spatial resolution and sensitivity. Initial performance tests show stable operation and enhanced image quality with time-of-flight reconstruction.

Keywords:
MR-compatiblePET insertRF-penetrableTOFsimultaneous PET/MRI

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Area of Science:

  • Medical Imaging
  • Physics
  • Engineering

Background:

  • Simultaneous Positron Emission Tomography (PET)/Magnetic Resonance Imaging (MRI) offers integrated anatomical, functional, and molecular insights for disease diagnosis.
  • Advancements in PET/MRI technology are crucial for improving diagnostic capabilities.

Purpose of the Study:

  • To report the initial system performance of a novel, second-generation, MR-compatible, radiofrequency-penetrable Time-of-Flight PET insert.
  • To evaluate the spatial resolution, sensitivity, and stability of the full-ring PET insert.

Main Methods:

  • Developed a full-ring PET insert with smaller scintillation crystals and ring diameter for enhanced resolution and sensitivity.
  • Utilized 12,288 LYSO-SiPM channels with a crystal size of 3.2 × 3.2 × 20 mm³.
  • Conducted stability tests over ten hours and resolution phantom studies (2.8 mm rods).
  • Performed initial MR compatibility studies with the unpowered PET ring.

Main Results:

  • Preserved global photopeak energy resolution (11.74 ± 0.03 % FWHM) and coincidence time resolution (238.1 ± 0.5 ps FWHM).
  • Achieved successful resolution of 2.8 mm rods in phantom studies, with VPR of 0.28 ± 0.08 (no TOF) and 0.24 ± 0.07 (TOF).
  • Demonstrated stable system performance (<1% change over 10 hours) and enhanced image quality with TOF.
  • No observable MR artifacts detected during initial unpowered MR compatibility tests, though SNR degradation (~30%) occurred with the body coil.

Conclusions:

  • The developed MR-compatible TOF-PET insert demonstrates promising performance with high spatial resolution and sensitivity.
  • The system exhibits stable operation and potential for improved image quality through TOF reconstruction.
  • Further development is needed for a dedicated receive-only MR coil to mitigate SNR degradation.