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US 5,179,338 AGranted
Refrigerated superconducting MR magnet with integrated gradient coils
AssigneeGeneral Electric Company
InventorsEvangelos T. Laskaris, Peter B. Roemer, Bizhan Dorri, Mark E. Vermilyea
Life of this patent
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Abstract
The invention relates to refrigerated superconducting MR magnets having integrated gradient coils. In particular, the amount of eddy currents produced by the magnet are substantially reduced while reducing the size and weight, and, therefore, the cost of the superconducting magnet required to produce an MR image.
Claims14
A refrigerated superconducting magnet for reducing eddy currents resulting from a gradient coil pulsation, said magnet is comprised of:
- at least two gradient coil means substantially located at a predetermined distance away from each other;
- a shield means substantially located between said gradient coil means;
- a magnet cartridge means having a coil form means and a coil means wound on said coil form means and substantially located within said shield means;
- a first and second support means substantially located between said magnet cartridge means and said shield means;
- a RF shield means rigidly attached to one of said gradient coil means;
- a vacuum enclosure means rigidly attached to said gradient coil means and enclosing said gradient coil means, said shield means, said cartridge means, and said support means;
- a RF coil means substantially located at a predetermined distance away from said RF shield means;
- and
- a passive shim means substantially located between said RF shield means and said RF coil means.
6 more elements
Dependencies are inferred from the claim text.