Magnetic resonance imaging method and apparatus capable of compe

Details Magnetic resonance imaging method and apparatus capable of compe Magnetic resonance imaging method and apparatus capable of compe

1992-09-18

1994-07-26

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

053329694

ABSTRACT:
In an MR (magnetic resonance) imaging method, not only eddy current field is compensated, but also a gradient field vibrated by a mechanical vibration caused by the eddy current is compensated. The method for imaging a biological body under medical examination by utilizing a magnetic resonance phenomenon under influence of a static magnetic field and a gradient magnetic field to acquire an MR image of a preselected slice portion within the biological body, comprising the steps of: producing a first drive current on which an eddy current field compensating current has been superimposed: producing a vibrating-field compensating current for compensating a gradient field vibrated by the eddy current; and superimposing the vibrating-field compensating current on the first drive current to obtain a second drive current. The second drive current is supplied to a gradient coil assembly for generating a gradient field whose vibrating field component has been compensated.

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P. Jehenson, M. Westphal, N. Schuff, "Analytical Method for the Compensation of Eddy-Current Effects Induced by Pulsed Magnetic Field Gradient in NMR Systems", Jour. of Magnetic Resonance, vol. 90, No. 2, Nov. 1, 1990, pp. 264-278.
J. J. Van Vaals, et al., "Optimization of Eddy-Current Compensation", Journal of Magnetic Resonance, vol. 90, No. 1, Oct. 15, 1990, pp. 52-90.

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