Nuclear magnetic resonance imaging with improved image quality a

Details Nuclear magnetic resonance imaging with improved image quality a Nuclear magnetic resonance imaging with improved image quality a

1993-03-12

1996-01-30

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

054882990

ABSTRACT:
A nuclear magnetic resonance imaging with improved image quality and operation efficiency. It uses an active shield coil with an outer shielding coil having at least two coil turns which are provided on a plurality of separate layers and mutually connected electrically, in order to reduce the heat generation. The eddy current in the shielding coil is reduced by providing a slit portion thereon. The eddy current compensation is achieved by using an appropriate eddy current compensation pulse to minimize a residual eddy current magnetic field within a desired field of view according to a model of a general expression of the residual eddy current magnetic field after the eddy current compensation. The optimum setting of the system parameters for various imaging pulse sequences is achieved for the undetermined gradient coil configuration as well as for the predetermined gradient coil configuration, according to a mathematical model analysis of various imaging pulse sequences.

REFERENCES:
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patent: 5077524 (1991-12-01), Hurd et al.
patent: 5177441 (1993-01-01), Morich et al.
Van Vaals, J. J. et al., "Optimization of Eddy-Current Compensation", Journal of Magnetic Resonance 90, pp. 52-70 (1990). Mo. of pub. unknown.
Boesch, Ch. et al., "Temporal and Spatial Analysis of Fields Generated by Eddy Currents in Superconducting Magnets: Optimization of Corrections and Quantitative Characterization of Magnet/Gradient Systems", Magnetic Resonance in Medicine 20, pp. 268-284 (1991). Mo. of pub. unknown.

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