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A novel optically transparent RF shielding for fully integrated PET/MRI systems.

C Parl1, A Kolb1, A M Schmid1

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Researchers developed a novel radiofrequency (RF) shielding material for integrated PET-MRI systems. This optically transparent shielding improves PET sensitivity by allowing scintillators closer to the object, enabling simultaneous high-resolution anatomical and molecular imaging.

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Area of Science:

  • Medical Imaging Physics
  • Biomedical Engineering
  • Radiochemistry

Background:

  • Simultaneous acquisition of high-resolution anatomical and molecular data is crucial for preclinical imaging.
  • Existing PET/MRI systems offer functional PET and MRI data but can be optimized for PET sensitivity.
  • Integrating MRI coils into PET systems requires effective radiofrequency (RF) shielding to prevent interference.

Purpose of the Study:

  • To propose and evaluate a system design for fully integrating MRI coils into PET systems to optimize PET sensitivity.
  • To investigate the use of optically transparent RF shielding materials between PET scintillators and light sensors.
  • To assess the performance of different RF shielding materials (ITO foil, 9900 foil, wire mesh) for PET/MRI compatibility.

Main Methods:

  • Designed a PET system with integrated MRI coils, positioning scintillators close to the object.
  • Evaluated two conductive foils (ITO, 9900) and a wire mesh as optically transparent RF shielding materials.
  • Tested PET performance using a dual-layer scintillator (LSO matrices) and SiPM array, measuring energy resolution, peak-to-valley ratio, and RF attenuation.

Main Results:

  • The ITO and 9900 foils showed minimal deterioration in PET energy resolution and peak-to-valley ratio, with 11.0-11.3% scintillation light attenuation.
  • The wire mesh provided better RF attenuation (20 MHz–200 MHz) but significantly impacted PET performance (higher energy resolution FWHM, lower peak-to-valley ratio) and light attenuation (54.3%).
  • An optically transparent RF shielding material that is MRI compatible and minimally affects PET performance was successfully demonstrated.

Conclusions:

  • Optically transparent RF shielding materials, specifically ITO and 9900 foils, are viable for integrated PET-MRI systems.
  • These materials enable the development of fully integrated PET detector and MRI coil assemblies, enhancing preclinical imaging capabilities.
  • The proposed design overcomes interference issues, paving the way for improved simultaneous anatomical and molecular data acquisition.