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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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Vacuum formed coils for MRI.

Karthik Gopalan1, Julian Maravilla1, Jaren Mendelsohn1

  • 1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California, USA.

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|December 8, 2022
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Summary
This summary is machine-generated.

Researchers developed a novel digital fabrication method for custom Magnetic Resonance Imaging (MRI) receive coils using vacuum forming and electroless copper plating. This technique enables the creation of intricate, body-conforming coils for advanced MRI applications.

Keywords:
MRIRFcoilcopper platingvacuum forming

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Medical Imaging

Background:

  • Custom MRI receive coils are crucial for optimizing signal-to-noise ratio (SNR) and spatial resolution.
  • Traditional fabrication methods can be complex and limit the ability to create coils conforming to specific anatomies.

Purpose of the Study:

  • To describe a novel digital fabrication method for custom MRI receive coils.
  • To utilize vacuum forming and electroless copper plating for creating intricate coil geometries on curved surfaces.

Main Methods:

  • A 3D scan of the anatomy is used to design coil elements, with predistortion accounting for vacuum forming effects.
  • Coil patterns are transferred to polycarbonate sheets via sandblasting, followed by catalysis and vacuum forming.
  • Electroless copper plating is applied to the formed parts, and electronic components are added to create resonant coils.

Main Results:

  • The fabricated coils demonstrated quality factor ratios greater than three, indicating body noise dominance.
  • The 8-channel visual cortex coil array achieved high SNR near the periphery of a head phantom.
  • In vivo imaging in a human volunteer achieved high spatial resolution.

Conclusions:

  • This study presents the first vacuum-formed coils fabricated with direct electroless copper plating.
  • The method allows for coil arrays in close proximity to the body, enhancing SNR.
  • This technique may facilitate rapid development of custom MRI coils for longitudinal fMRI and MR-guided therapies.