Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1996-02-20
1996-10-22
Spyrou, Cassandra C.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
324319, 324320, H01F 606, G01V 300
Patent
active
055681026
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 and at least one additional superconductive main coil. A pair of generally annular-shaped permanent magnet arrays is spaced radially inward and apart from the superconductive main coils. The permanent magnet arrays allow the design of a shorter MRI magnet because the permanent magnet arrays 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. 08/457,085, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Cryogenic-Fluid-Cooled Open MRI Magnet with Uniform Magnetic Field".
Pending U.S. Patent Application Ser. No. 08/547,002, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Open MRI Magnet with Homogeneous Imaging Volume".
Pending U.S. Patent Application Ser. No. 08/553,734, filed Oct. 23, 1995, by E. T. Laskaris et al., entitled "Open MRI Magnet with Uniform Imaging Volume".
Pending U.S. Patent Application Ser. No. 08/509,565, filed Jul. 31, 1995, by T. Havens et al., entitled "Open Architecture Magnetic Resonance Imaging superconducting Magnet Assembly".
Pending U.S. Patent Application Ser. No. 08/547,083, filed Oct. 23, 1995, by Bizhan Dorri et al., entitled "Shielded and Open MRI Magnet".
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".
Pending U.S. Patent Application Ser. No. 08/373,996, filed Oct. 17, 1995, by Bizhan Dorri, entitled "Method for Passively Shimming a Magnet".
Concurrently filed U.S. Patent Application RD-24542, by Bizhan Dorri et al., entitled "Closed Superconductive Magnet with Uniform Imaging Volume" Ser. No. 08/603521.
Concurrently filed U.S. Patent Application RD-24845, by Bizhan Dorri et al., entitled "Closed MRI Magnet Having Reduced Length", Ser. No. 08/603522.
Dorri Bizhan
Laskaris Evangelos T.
Ogle Michele D.
Barrera Raymond M.
Erickson Douglas E.
General Electric Company
Snyder Marvin
Spyrou Cassandra C.
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