Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1991-10-16
1993-05-25
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324300, G01R 3320
Patent
active
052143830
ABSTRACT:
External field compensation is provided for MRI apparatus which is in a magnetically noisy environment such as that caused by nearby subway trains. By means of a magnetometer type sensor, the external field fluctuation is sensed and after being adjusted for the filtering effect of the magnet structure of the MRI device itself, the master oscillator of the MRI device is adjusted to compensate for the external field fluctuation. Alternatively the current of the magnet coil is adjusted.
REFERENCES:
patent: 3609519 (1971-09-01), Seki et al.
patent: 3774103 (1973-11-01), Laukien
patent: 3873909 (1975-03-01), Ernst
"Development of MRI System with Permanent Magnet" by Yanaka et al, based on 3rd Japanese-French Biomedical Technologies Symposium, May 5-7, 1989 in Himeji, Japan.
Preprint of Paper entitled "A Superconductive Solenoid System which Cancels Fluctuations in the Ambient Magnetic Field" in the name of Gabrielse et al, submitted to the Journal of Magnetic Resonance.
Moberly John
Motamedi Rick
Perlmutter Robert J.
Wilfley Brian P.
Resonex, Inc.
Tokar Michael J.
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