Magnet system for magnetic resonance imaging

Details Magnet system for magnetic resonance imaging Magnet system for magnetic resonance imaging

1992-10-06

1995-03-07

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335216, 335296, 335299, 324319, G01V 300

Patent

active

053962087

ABSTRACT:
An extremely efficient magnet system having a comparatively large angle of aperture can be obtained for magnetic resonance imaging by a reduction of fields of all orders in a common approach affecting active and passive as well as positive and negative oriented coil elements. Passive soft-magnetic ring segments are arranged in two pairs and located within a plurality of larger diameter active magnetic coils. The active coils include a central coil and outer coils wherein the outer coils are smaller than the central coil. The coils are in a helium Dewar vessel and arranged such that the system has an aperture of about 90.degree.. The central active coil may have a larger radius than the smaller outer coils.

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patent: 5136273 (1992-08-01), Ohta

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