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Visualization of electrical activity in the cervical spinal cord and nerve roots after ulnar nerve stimulation using magnetospinography |
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| Institution: | 1. Healthcare Business Group, RICOH Company, Ltd., 2-3-10 Kandasurugadai Chiyoda-ku, Tokyo 101-0062, Japan;2. Department of Advanced Technology in Medicine, Graduate School of Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan;3. Respiratory and Nervous System Science, Biomedical Laboratory Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan;4. Department of Orthopaedic Surgery, Tokyo Medical and Dental University,1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan;5. Applied Electronics Laboratory, Kanazawa Institute of Technology, Kanazawa-shi, Ishikawa 920-1331, Japan |
| Abstract: | ObjectiveTo establish a method for magnetospinography (MSG) measurement after ulnar nerve stimulation and to clarify its characteristics.MethodsUsing a 132-channel magnetoneurography system with a superconducting quantum interference device, cervical MSG measurements were obtained for 10 healthy volunteers after stimulation of the ulnar nerve at the elbow and the wrist, and neural current distribution was calculated and superimposed on the cervical X-ray images.ResultsNeuromagnetic signals were obtained in all participants after applying the stimulus artifact removal algorithm. The measured magnetic field intensity after elbow stimulation was about twice that after wrist stimulation. Calculated neural currents flowed into the intervertebral foramina at C6/7 to T1/2 and propagated cranially along the spinal canal. The conduction velocity from the peak latency of inward currents at C5-C7 was 73.4 ± 19.6 m/s.ConclusionsWe successfully obtained MSG measurements after ulnar nerve stimulation. The neural currents flowed into the spinal canal from more caudal segments after ulnar nerve stimulation compared with median nerve stimulation, and these MSG measurements were effective in examining the spinal tracts at C5/6/7.SignificanceThis is the first report on the use of MSG to visualize electrical activity in the cervical spinal cord and nerve root after ulnar nerve stimulation. |
| Keywords: | Magnetoneurography Magnetospinography Evoked magnetic field Somatosensory evoked potential Ulnar nerve CSP"} {"#name":"keyword" "$":{"id":"k0035"} "$$":[{"#name":"text" "_":"common-mode subspace projection DSSP"} {"#name":"keyword" "$":{"id":"k0045"} "$$":[{"#name":"text" "_":"dual signal subspace projection MSG"} {"#name":"keyword" "$":{"id":"k0055"} "$$":[{"#name":"text" "_":"magnetospinography SEP"} {"#name":"keyword" "$":{"id":"k0065"} "$$":[{"#name":"text" "_":"somatosensory evoked potentials SQUID"} {"#name":"keyword" "$":{"id":"k0075"} "$$":[{"#name":"text" "_":"superconducting quantum interference device UGRENS"} {"#name":"keyword" "$":{"id":"k0085"} "$$":[{"#name":"text" "_":"unit gain constraint recursively applied null-steering spatial filtering |
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