Biomagnetometer with whole head coverage of a seated reclined su

Details Biomagnetometer with whole head coverage of a seated reclined su Biomagnetometer with whole head coverage of a seated reclined su

1995-05-30

1998-02-03

Smith, Ruth S.

Surgery

Truss

Pad

324248, A61B 505

Patent

active

057133549

ABSTRACT:
A biomagnetometer includes a dewar vessel having a helmet-shaped recess at the lower end of its body. The recess is angled at about 45 degrees to the dewar body axis of the dewar vessel. Biomagnetic sensors are positioned within the interior of the dewar vessel body around the periphery of the recess. The angled recess permits the biomagnetometer to be used with subjects whose heads are inclined from 0 to 90 degrees to the horizontal by pivoting the dewar vessel over an angle of from -45 degrees to +45 degrees to the vertical, without spilling the cryogenic fluid within the dewar or causing excessive evaporation of the cryogenic fluid.

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T. Ryhanen et al., "SQUID Magnetometers for Low-Frequency Applications", J. Low Temperature Physics, vol. 76, Nos. 5/6, pp. 287-290 and 363-369 (1989).
International Standards Organization, "Headforms for use in the testing of protective helmets", ISO Standard 6220 (1983).
Jukka Knuutila et al., "Large-area low-noise seven channel dc SQUID magnetometer for brain research", Rev. Sci. Instrum., vol. 58(11), pp. 2145-2156 (1987).

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