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Facial magnetomyography using an array of optically pumped magnetometers.

Johannes von Fraunberg1, Hongyu Lu2, Haodi Yang2

  • 1Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre, Molecular Physiology of Hearing, University of Tübingen, Tübingen, Germany.

Clinical Neurophysiology Practice
|April 16, 2025
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Summary

Contactless Magnetomyography (MMG) using optically pumped magnetometers (OPM) can visualize facial muscle activity. This technology shows promise for diagnosing and monitoring facial palsy and related disorders.

Keywords:
FaceFacial nerve disordersMMGNeurophysiologyOPMPalsy

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Imaging

Background:

  • Accurate measurement of facial muscle activity is vital for diagnosing facial palsy.
  • Current methods may be invasive or limited in scope.
  • Contactless techniques offer potential for improved assessment.

Purpose of the Study:

  • To investigate the feasibility of using contactless Magnetomyography (MMG) with optically pumped magnetometers (OPM) for visualizing facial muscle activity.
  • To assess the potential of OPM-MMG for clinical applications in facial nerve disorders.

Main Methods:

  • Developed an anatomically shaped mask with eleven OPM sensors.
  • Recorded MMG signals from five healthy subjects performing various facial expressions.
  • Analyzed signal root mean square (RMS) and signal-to-noise ratio (SNR) for individual muscle activity.

Main Results:

  • Successfully measured individual facial muscle activity for different expressions.
  • Achieved a mean RMS of 0.6pT (SD 0.4pT) and a mean SNR of 2.2 (SD 1.2).
  • Demonstrated the capability of OPM-MMG to image facial muscle dynamics.

Conclusions:

  • Contactless MMG with OPM is feasible for imaging facial muscle activity.
  • Optimal sensor positioning is critical for effective measurement.
  • Low signal amplitude and anatomical variability present challenges but do not preclude clinical utility.