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RF shielding materials for highly-integrated PET/MRI systems.

Laiyin Yin1, Franziska Schrank1, Nicolas Gross-Weege1

  • 1Department of Physics of Molecular Imaging Systems, Institute for Experimental Molecular Imaging, RWTH Aachen University, Aachen, Germany.

Physics in Medicine and Biology
|April 8, 2021
PubMed
Summary
This summary is machine-generated.

Researchers evaluated radio frequency (RF) shielding materials for simultaneous positron emission tomography (PET) and magnetic resonance imaging (MRI) systems. Coated foils like HS 9400 offer a good balance of shielding effectiveness and minimal impact on PET and MRI performance.

Keywords:
PET/MRIRF shieldingRF shielding materialintegrated PET/MRIintegrated RF shieldingpreclinical PET/MRI

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Area of Science:

  • Medical Imaging Physics
  • Materials Science for Medical Devices
  • Radio Frequency Engineering

Background:

  • Simultaneous PET/MRI systems require novel radio frequency (RF) shielding solutions to mitigate interference.
  • Conventional PET detector housings limit integration possibilities; excluding components like scintillators offers advantages but necessitates RF shielding interfaces.
  • Selecting appropriate RF shielding materials is critical for maintaining both PET and MRI performance.

Purpose of the Study:

  • To evaluate the shielding effectiveness (SE) and impact on positron emission tomography (PET) performance of various RF shielding materials.
  • To assess the magnetic resonance imaging (MRI) compatibility of these materials by analyzing their effect on magnetic field homogeneity.
  • To identify optimal RF shielding materials for integrated PET/MRI systems.

Main Methods:

  • Examined 10 different RF shielding materials, including coated glasses, coated foils, and meshes.
  • Measured shielding effectiveness (SE) at 100 and 300 MHz.
  • Assessed PET performance by measuring photon attenuation (PA), energy resolution (dE/E), and coincidence resolving time (CRT).
  • Evaluated MRI compatibility by analyzing the impact on B0 field homogeneity.

Main Results:

  • Coated glasses and foils achieved SEs up to 25 dB at 300 MHz with low photon attenuation (<23%) and minimal impact on PET performance (dE/E, CRT) and B0 homogeneity.
  • Meshes offered higher SEs (up to 56 dB) but resulted in significantly higher photon attenuation (>58%) and greater degradation of PET performance metrics.
  • Coated foil HS 9400 demonstrated excellent performance with SE = 25 dB, PA = 22%, dE/E = 12%, and CRT = 274 ps, with no measurable impact on B0 homogeneity.

Conclusions:

  • Coated foils and glasses are promising candidates for RF shielding interfaces in integrated PET/MRI systems due to their balance of shielding capability and minimal performance impact.
  • Meshes provide superior shielding but their high photon attenuation and impact on PET performance limit their suitability for this application.
  • The coated foil HS 9400 is recommended for PET/MRI integration concepts, offering a robust solution for effective RF shielding without compromising image quality or system compatibility.