Title :
Whole cortex, 64 channel SQUID biomagnetometer system
Author :
Vrba, J. ; Betts, K. ; Burbank, M. ; Cheung, T. ; Fife, A.A. ; Haid, G. ; Kubik, P.R. ; Lee, S. ; McCubbin, J. ; McKay, J. ; McKenzie, D. ; Spear, P. ; Taylor, B. ; Tillotson, M. ; Cheyne, D. ; Weinberg, H.
Author_Institution :
CTF Systems Inc., Port Coquitlam, BC, Canada
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors report on the development and testing of a novel, whole cortex, 64-channel superconducting quantum interference device (SQUID) biomagnetometer system operating in an unshielded environment. The essential features of this instrument, including the cryogenics system, the room-temperature digital electronics, and signal processing capabilities, are described. A noise cancellation scheme is incorporated which allows extraction of biomagnetic signals over the surface of the cortex while operating in the presence of large background magnetic interference. A system description and the results of preliminary magneto-encephalographic measurements are presented. Measurements of noise performance and human auditory evoked response in an unshielded industrial environment have largely validated the noise cancellation methods incorporated in the instrument.<>
Keywords :
SQUIDs; biomagnetism; biomedical equipment; biomedical measurement; brain; interference suppression; magnetometers; medical signal processing; 64 channel SQUID biomagnetometer system; biomagnetic signal extraction; cryogenics system; human auditory evoked response; large background magnetic interference; magneto-encephalographic measurements; noise cancellation scheme; noise performance; room-temperature digital electronics; signal processing; testing; unshielded industrial environment; whole cortex system; Cryogenics; Digital signal processing; Instruments; Interference; Noise cancellation; SQUIDs; Superconducting device noise; Superconducting devices; Superconducting magnets; System testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
