Apparatus for measuring weak, location-dependent and time-depend

Details Apparatus for measuring weak, location-dependent and time-depend Apparatus for measuring weak, location-dependent and time-depend

1992-07-06

1993-11-30

Smith, Ruth S.

Surgery

Truss

Pad

324248, 324262, A61B 505

Patent

active

052656110

ABSTRACT:
An apparatus for measuring weak, location-dependent and time-dependent magnetic fields emitted from a source situated in an examination subject includes a sensor arrangement having at least ten gradiometers of the first order, each gradiometer being inductively coupled to a DC-SQUID. The sensor arrangement and the examination subject are disposed in a room which shields the examination subject and the sensor arrangement from magnetic fields. The room has a shielding factor of at least 10 for magnetic alternating fields having a frequency of 0.5 Hz, the shielding factor increasing with increasing frequency. A method for operating the apparatus is also disclosed.

REFERENCES:
patent: 4736751 (1988-04-01), Gevins et al.
Kelha et al, "Design, Construction, and Performance of a Large-Volume Magnetic Shield", IEEE Transactions on Magnetics, vol. MAG-18, No. 1, Jan. 1982, pp. 260-270.
Knuutila et al, "Large-area low-noise seven-channel dc SQUID magnetometer for brain research", Review of Scientific Instruments, vol. 58, No. 11, Nov. 1987, pp. 2145-2156.
Erne et al, "Biomagnetism", Proceedings Third International Workshop on Biomagnetism, Berlin (West), May 1980.
Hamalainen et al, "Characterization of Brain Noise with a 7-Channel SQUID Magnetometer", Proceedings of the 18th International Conference on Low Temperature Physics, Japanese Journal of Applied Physics, vol. 26, Supplement 26-3 (1987), pp. 1569-1560.

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