Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1989-09-08
1991-06-18
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
050252178
ABSTRACT:
In a magnetic resonance apparatus eddy current effects are compensated by measurement of the eddy current behaviour in a comparatively large measurement object on the basis of resonance signals generated therein, for example briefly after de-activation of a gradient field control signal. From these measurements a series of exponentially decreasing signals is calculated. These correction signals are generated by appropriate switching circuits which are preferably adjustable as regards decay time and amplitude. The correction can be performed for the gradient field symmetry corresponding to the switched gradient field transition as well as for eddy currents, if any, having a field symmetry which deviates therefrom.
REFERENCES:
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patent: 4703275 (1987-11-01), Holland
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patent: 4761612 (1988-08-01), Holland et al.
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Y. S. Kim and Z. H. Cho, "Eddy-Current-Compensated Field-Inhomogeneity Mapping in NMR Imaging," Journal of Magnetic Resonance, vol. 78 (1988), pp. 459-471.
Squire William
Tokar Michael J.
U.S. Philips Corporation
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