We developed a 24-channel superconducting quantum interference devices (SQUIDs) biomagnetometer system for the measurement of the evoked magnetic field from stimulated spinal cord and peripheral nerves. Eight composite Low-Tc SQUID gradiometers were used in the system. Each combination sensor was composed of one axial-type gradiometer and two planar-type gradiometers which were located in the direction perpendicular to each other. Therefore the system can observe the three-dimensional components of the magnetic field. We could successfully observe the distribution of the cervical spinal cord evoked magnetic fields (SCEFs) following the electric stimulation at thoracic spine in a small animal by the developed system.
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