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Novel functional imaging technique for the brachial plexus based on magnetoneurography.

Taishi Watanabe¹, Shigenori Kawabata², Yuko Hoshino²

¹Department of Orthopedic Surgery, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; Healthcare Business Groupe, RICOH Company, Ltd., 2-3-10 Kandasurugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology

|September 23, 2019

Summary

Magnetoneurography (MNG) visualizes neural activity in the brachial plexus. This novel imaging technique differentiates conduction pathways for median and ulnar nerves, showing promise for functional imaging.

Keywords:

Brachial plexus Conduction velocity Evoked magnetic field Magnetoneurography Median nerve Ulnar nerve

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Area of Science:

Neuroscience
Biophysics
Medical Imaging

Background:

The brachial plexus is crucial for upper limb function.
Accurate visualization of neural activity within the brachial plexus is challenging.
Magnetoneurography (MNG) offers a potential non-invasive method.

Purpose of the Study:

To visualize neural activity in the brachial plexus using magnetoneurography (MNG).
To assess MNG's capability in differentiating neural pathways of specific nerves.

Main Methods:

Utilized a 124- or 132-channel biomagnetometer system.
Recorded neuromagnetic fields in response to electrical stimulation of median and ulnar nerves.
Reconstructed and visualized equivalent currents from neuromagnetic fields.

Main Results:

Neuromagnetic fields were successfully recorded in all subjects.
Reconstructed equivalent currents showed distinct propagation patterns for median and ulnar nerves.
High linear correlation was found between inward current peaks and compound nerve action potentials.

Conclusions:

Magnetoneurography (MNG) effectively visualizes neural activity in the brachial plexus.
MNG can differentiate conduction pathways of median and ulnar nerves.
MNG visualizes intra-axonal currents and inward currents at the depolarization site.