Thrust balanced bi-planar gradient set for MRI scanners

Details Thrust balanced bi-planar gradient set for MRI scanners Thrust balanced bi-planar gradient set for MRI scanners

1997-12-10

1999-08-24

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324320, G01V 300

Patent

active

059428988

ABSTRACT:
A magnetic resonance imaging apparatus has a main magnet (20) having opposite first and second poles (22, 24) arranged facing one another to define a subject receiving region (14) therebetween. The main magnet (20) generates a main magnetic field (12) within the subject receiving region (14). The main magnetic field (12) has non-uniformities and radial components at the periphery of the subject receiving region (14). A radio frequency coil (74) is disposed about the subject receiving region (14) to transmit radio frequency signals into the subject receiving region (14) and a receiver receives radio frequency signals therefrom. A shielded thrust balanced bi-planar gradient coil assembly (50) is included. The shielded thrust balanced bi-planar gradient coil assembly (50) has at least one pair of windings for generating substantially linear magnetic gradients across the subject receiving region (14). Each pair of windings includes a first set of windings (52) and a second set of windings (54), and each set of windings includes at least a primary winding (56) and a secondary winding (58). The first and second set of windings (52, 54) are positioned on opposite sides of the subject receiving region (14) near the first and second pole pieces (22, 24). The secondary windings (58) are positioned between their respective primary windings (56) and their associated pole pieces (22, 24). The first and second set of windings (52, 54) are arranged such that the net thrust forces acting thereon generated by interaction between the main magnetic field (12) and electrical current pulses through the windings are substantially zero.

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"Biplanar Gradient Coil for Interventional Open-Concept Superconducting Magnet," Atila Ersahin, R. Scott Hinks, Michael J. Bronskill and R. Mark Henkelman, Society of Magnetic Resonance Third Scientific Meeting.
"Actively Shielded Biplanar Gradient Set for Open Magnet Geometries with Vertically Directed Fields," L.S. Petropoulos, Aug. 19-25, 1995, Society of Magnetic Resonance Third Scientific Meeting.

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