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Magnetoneurography as a novel functional imaging technique for cervical myelopathy
Shigenori Kawabata1, Yuko Hoshino2, Yoshiaki Adachi3
1Department of Advanced Technology in Medicine, Institute of Biomedical Engineering, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan; Department of Orthopedic Surgery, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.
Magnetoneurography (MNG) effectively visualizes neural currents in degenerative cervical myelopathy, potentially detecting electrophysiological changes below spinal cord compression sites. This novel imaging technique offers new neurological insights.
Area of Science:
- Neuroscience
- Medical Imaging
- Electrophysiology
Background:
- Degenerative cervical myelopathy (DCM) presents diagnostic challenges.
- Conventional electrophysiological methods struggle to visualize neural current dynamics.
Purpose of the Study:
- To assess the efficacy of magnetoneurography (MNG) for examining neurological conditions in DCM.
- To explore MNG's potential in identifying electrophysiological changes in the spinal cord.
Main Methods:
- Electrical stimulation of median and ulnar nerves in healthy participants and DCM patients.
- Recording evoked magnetic fields using a 132-channel SQUID biomagnetometer.
- Evaluating spatiotemporal changes in reconstructed action currents and comparing MNG/MRI diagnoses with clinical findings.
Main Results:
- Magnetoneurography successfully recorded evoked magnetic fields in all subjects.
- MNG and MRI findings were consistent in 16 out of 21 patients.
- In five cases, MNG identified lesions at a lower spinal cord level than MRI.
Conclusions:
- MNG visualizes the spatiotemporal course of neural currents, a feat difficult for conventional techniques.
- MNG may detect electrophysiological changes below the compression site, complementing MRI findings.
- Magnetoneurography shows promise as a valuable imaging technique for novel neurological discoveries in DCM.
