Abstract:
A superconducting quantum interference device (SQUID) magnetometer has successfully detected magnetic fields emitted from a human brain in a helmet-size superconducting m...Show MoreMetadata
Abstract:
A superconducting quantum interference device (SQUID) magnetometer has successfully detected magnetic fields emitted from a human brain in a helmet-size superconducting magnetic shield of the high-T/sub c/ superconductor Bi-Sr-Ca-Cu-O/sub x /(BSCCO). The sensitivities of the RF-SQUID and the DC-SQUID of quasi-planar Josephson junctions-superconducting weak links are 20 fT/ square root Hz and 4 fT/ square root Hz, respectively. The magnetic shield can reduce a magnetic field to -120 dB or 10/sup -6/ even at as low a frequency as 0.2 Hz. The authors have detected somatosensory evoked magnetic fields stimulating the tibial nerves of the patient by current pulses.<>
Published in: IEEE Transactions on Applied Superconductivity ( Volume: 3, Issue: 1, March 1993)
DOI: 10.1109/77.233577
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