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MRI Safety Considerations for Permanent Magnet Implants in Muscle.

Cameron R Taylor1,2, Eric D Anttila3, Steven J Charlebois3

  • 1K. Lisa Yang Center for Bionics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Journal of Magnetic Resonance Imaging : JMRI
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PubMed
Summary
This summary is machine-generated.

Permanent magnet implants for prosthetic control showed no migration and minimal demagnetization in MRI up to 1.5T. These findings suggest patients with these implants can safely undergo MRI scans.

Keywords:
MRI conditionalityintramuscular implantsmagnetic implantspermanent magnet implants

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Radiology

Background:

  • Permanent magnet implants are utilized in various medical devices, including cochlear implants and prosthetic controls.
  • Their use necessitates caution due to potential interactions with Magnetic Resonance Imaging (MRI).
  • Previous research assessed magnet stability and image artifacts, but intramuscular magnets for prosthetics require further MRI conditionality evaluation.

Purpose of the Study:

  • To evaluate the position and magnetization stability of 3-mm-diameter spherical permanent magnets implanted in muscle.
  • To assess image artifacts generated by these implants under MRI conditions.

Main Methods:

  • A prospective longitudinal study was conducted using porcine models with magnets implanted in eight muscles.
  • Histological examination assessed implant migration and fibrotic response, complemented by CT imaging for secondary analysis.
  • Benchtop studies quantified worst-case demagnetization and MRI image artifact sizes.

Main Results:

  • Histological analysis revealed intact fibrotic capsules around both magnet and control sites, indicating no significant migration.
  • MRI exposure at 0.55-T and 1.5-T did not affect implant migration (p > 0.96).
  • Maximum demagnetization was 13.5% at 1.5-T, and image artifacts extended up to 71 mm.

Conclusions:

  • The studied permanent magnet implants demonstrated resistance to migration and substantial demagnetization under 0.55-T and 1.5-T MRI.
  • Negligible image artifacts were observed, suggesting these implants do not contraindicate MRI up to 1.5T.
  • Patients with these intramuscular permanent magnet implants can likely undergo MR imaging safely.