Measurement of Somatosensory Evoked Magnetic Fields Using Adjustable Magnetoresistive Sensor Array

• DOI: 10.36227/techrxiv.22850834.v1
• Publication Date: 2023-05-19T20:38:29Z
• Authors: Tetsuro Tatsuoka; Shigenori Kawabata; Jun Hashimoto; Yuko Hoshino; Tomohiko Shibuya; Yoshiaki Adachi; Atsushi Okawa
• Keywords: Magnetoencephalography; Somatosensory evoked potential

<p>An adjustable helmet-style magnetoresistive (MR) sensor array, a room-temperature magnetic flux sensor, was developed to demonstrate simultaneous multipoint measurement of the somatosensory evoked field (SEF). The SEF measured in three healthy subjects using an array 30-channel MR sensors placed on left hemisphere head with median nerve stimulation right wrist and averaged over 8,000 measurements. An M20 component (maximum amplitude 725 ± 257 fT, peak latency 20.5 0.45 ms), considered originate from primary cortex, observed at approximate 20 ms waveform all cases. phase inversion around C3 corresponded palmar area cortex contour map peak. relatively inexpensive easy-to-use that does not require zero-field environment, successfully used for measurements humans may be promising option realize reasonable magnetoencephalography application device. </p>