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Measuring functional connectivity with wearable MEG.

Elena Boto1, Ryan M Hill1, Molly Rea1

  • 1Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.

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Summary
This summary is machine-generated.

Wearable optically-pumped magnetometers (OPMs) enable magnetoencephalography (MEG) network connectivity measurements. This study demonstrates OPM-MEG

Keywords:
AECAmplitude-envelope correlationFunctional connectivityMEGMagnetoencephalographyNetworkOPMOPM-MEGOptically-pumped magnetometerWearable MEG

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Area of Science:

  • Neuroscience and Biomedical Engineering
  • Advanced sensor technology for brain imaging

Background:

  • Magnetoencephalography (MEG) is crucial for studying brain networks, but traditional cryogenic systems are costly and immobile.
  • Optically-pumped magnetometers (OPMs) offer a promising alternative for wearable, high-quality MEG.
  • Characterizing brain networks is vital for understanding neurological disorders.

Purpose of the Study:

  • To demonstrate that a wearable 50-channel OPM-MEG system can effectively characterize the electrophysiological connectome.
  • To validate OPM-MEG's capability by comparing its network measurements with a state-of-the-art cryogenic MEG system.

Main Methods:

  • Utilized a 50-channel wearable OPM-MEG system.
  • Recorded brain activity during resting-state and a visuo-motor task.
  • Compared connectivity data with a 275-channel cryogenic MEG device.

Main Results:

  • OPM-MEG resting-state connectome matrices showed high similarity (>70% correlation) to cryogenic MEG data.
  • Individual connectivity differences during a task were consistently observed between OPM-MEG and cryogenic MEG.
  • This marks the first demonstration of network connectivity measurements using OPM-MEG.

Conclusions:

  • Wearable OPM-MEG systems are capable of accurately characterizing brain network connectivity.
  • OPM-MEG demonstrates high fidelity comparable to cryogenic systems.
  • OPM technology shows potential to supersede cryogenic sensors for future MEG applications.