Gradient coils with reduced eddy currents

Details Gradient coils with reduced eddy currents Gradient coils with reduced eddy currents

1997-01-29

1998-09-08

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01V 300

Patent

active

058049681

ABSTRACT:
A magnetic resonance imaging apparatus includes a main field magnet (12) for generating a temporally constant magnetic field through an examination region. A radio frequency transmitter (84) excites and manipulates magnetic resonance in selected dipoles in the examination region. A receiver (90) demodulates magnetic resonance signals received from the examination region, a processor (74) reconstructs the demodulated resonance signals into an image representation. A plurality of fingerprint gradient magnetic field coils (24, 26) induce gradient magnetic fields across the temporally constant magnetic field. Each of the fingerprint gradient coils (24, 26) includes a generally spiral winding (32A-32D) having a first crossectional dimension (H) perpendicular to the temporally constant magnetic field which is at least twice a second crossectional dimension (W) in a direction parallel to the temporally constant magnetic field.

REFERENCES:
patent: 4840700 (1989-06-01), Edelstein et al.
patent: 5177442 (1993-01-01), Roemer
patent: 5424643 (1995-06-01), Morich et al.
patent: 5488299 (1996-01-01), Kondo et al.
patent: 5568051 (1996-10-01), Yamagata
patent: 5642049 (1997-06-01), Harada et al.
Serial No. 08/529,360, Issue Fee paid on Dec. 4, 1996, assigned to Assignee of present invention.

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