Biomagnetic measurement system for supine subjects with expanded sensor array and real-time noise reduction.

A biomagnetic measurement system was developed, suitable for the detection of magnetospinogram (MSG) and magnetocardiogram (MCG) signals from the dorsal surface of supine subjects. It is effective for noninvasively observing the electric activity of the spinal cord and/or heart. These biomagnetic signals are extremely weak, and magnetic flux sensors based on superconducting quantum interference devices (SQUIDs) are necessary to detect them.