Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1995-10-23
1996-10-15
Brown, Brian W.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
335301, 324318, 324319, G01V 300
Patent
active
055658318
ABSTRACT:
A shielded and open magnetic resonance imaging (MRI) magnet having two spaced-apart, generally toroidal-shaped superconductive coil assemblies. Each coil assembly has a coil housing containing a generally annular-shaped superconductive main and a radially-outwardly spaced-apart shielding coil carrying electric currents in opposing directions. Preferably, supplemental shielding is provided with the addition of: a generally annular permanent magnet configuration internal to, or external of, the coil housings; a generally-non-permanently-magnetized external ferromagnetic shield having at least a portion positioned longitudinally between the coil housings, an external resistive coil; or combinations thereof.
REFERENCES:
patent: 4724412 (1988-02-01), Kalafala
patent: 4924198 (1990-05-01), Laskaris
patent: 5237300 (1993-08-01), Ige et al.
patent: 5291169 (1994-03-01), Ige et al.
patent: 5309106 (1994-05-01), Miyajima et al.
patent: 5389909 (1995-02-01), Havens
patent: 5410287 (1995-04-01), Laskaris et al.
patent: 5448214 (1995-09-01), Laskaris
patent: 5463364 (1995-10-01), Miller
Pending U.S. Patent No. 5,517,169 filed Oct. 17, 1994, by E. T. Laskaris et al., entitled "Superconducting Magnet with Magnet Shielding".
Pending U.S. Patent No. 5,517,168, filed Oct. 17, 1994, by E. T. Laskaris et al., entitled "Superconducting Magnet with Magnet Shielding".
Concurrently filled U.S. Patent Application RD-24637, by Bizhan Dorri et al., entitled "Cryogenic-Fluid-Cooled Open MRI Magnet with Uniform Magnetic Field", Serial No. 08/547085.
Concurrently filed U.S. Patent Application RD-24648, by Bizhan Dorri et al., entitled "Open MRI Magnet with Homogeneous Imaging Volume", Serial No. 08/547002.
Dorri Bizhan
Havens Timothy J.
Laskaris Evangelos T.
Ogle Michele D.
Barrera Raymond M.
Brown Brian W.
Erickson Douglas E.
General Electric Company
Snyder Marvin
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