Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1998-03-30
2000-11-28
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, 324309, 324307, G01R 3320, G01V 300
Patent
active
061540307
ABSTRACT:
Eddy current compensation for magnetic field transients arising from electric current transients is obtained by digital computation of the time dependence of the eddy current magnetic effect, reversing the sense thereof to obtain a corrective signal portion, converting both the corrective portion and the basic signal profile to analogue form, summing same and directing the pre-compensated electric current through an inductive element.
REFERENCES:
patent: 4292589 (1981-09-01), Bonner
patent: 4698591 (1987-10-01), Glover et al.
patent: 4743851 (1988-05-01), Lim et al.
Article by Jehenson et al., entitled "Analytical Method for the Compensation of Eddy-Current Effects Induced by Pulsed Magnetic Field Gradients in NMR Systems," published in Journal of Magnetic Resonance in 1990, in vol. 90, pp. 264-278.
Article by van Vaals et al., entitled "Optimization of Eddy-Current Compensation," published in Journal of Magnetic Resonance 1990, in vol. 90, pp. 52-70.
Article by Morich et al., entitled "Exact Temporal Eddy Current Compensation in Magnetic Resonance Imaging Systems," published in IEEE Transactions on Medical Imaging in 1988, in vol. 7, No. 3, pp. 247-254.
Article by van Vaals et al., entitled "Optimization of Eddy-Current Compensation", published in Journal of Magnetic Resonance 90 on Oct. 15, 1990, No. 1, pp. 50-70.
Article by Majors et al., entitled "Eddy current Compensation by Direct Field Detection and Digital Gradient Modification", published in Journal of Magnetic Resonance 87 on May 1990, No. 3, pp. 548-553.
Berkowitz Edward H.
Fetzner Tiffany A.
Oda Christine K.
Varian Inc.
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