Closed MRI magnet having reduced length

Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type

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324319, H01F 606, G01V 300

Patent

active

055681107

ABSTRACT:
A closed magnetic resonance imaging (MRI) magnet has a single superconductive coil assembly including a toroidal-shaped coil housing containing a pair of superconductive main coils. A pair of generally annular-shaped bucking coils, carrying electric current in a direction opposite to that of the superconductive main coils, is spaced radially inward and apart from the superconductive main coils. The bucking coils allow the design of a shorter MRI magnet because the bucking coils overcome the gross magnetic field distortions in the imaging volume of the magnet (created by removing some of the additional longitudinally-outermost superconductive main coils, otherwise used in the magnet, to make the magnet shorter) to produce a magnetic field of high uniformity within the imaging volume.

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Pending U.S. patent application Ser. No. 08/373,995, filed Oct. 17, 1995, by Bizhan Dorri, entitled "Method For Passively Shimming an Open Magnet".
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Concurrently filed U.S. patent application RD-24542, by Bizhan Dorri et al, entitled "Closed Superconductive Magnet With Uniform Imaging Volume", Ser. No. 08/603,521.
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