Open MRI superconductive magnet with cryogenic-fluid cooling

Details Open MRI superconductive magnet with cryogenic-fluid cooling Open MRI superconductive magnet with cryogenic-fluid cooling

1995-10-23

1996-10-22

Brown, Brian W.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

62 511, 324318, F25B 1900, G01V 300

Patent

active

055681042

ABSTRACT:
An open magnetic resonance imaging (MRI) magnet having first and second spaced-apart superconductive coil assemblies each including a toroidal-shaped coil housing containing a superconductive main coil in thermal contact with a cryogenic fluid contained in a dewar. Preferably, each main coil is located outside of and in solid-conduction thermal contact with its corresponding dewar (instead of inside the dewar). Preferably, a surrounding single (not double) thermal shield is cooled by liquid cryogen boil-off or by a cryocooler coldhead. All this allows the main coil to be located closer to the magnet's open space which reduces magnet cost by reducing the amount of coil needed for the same-strength magnetic field.

REFERENCES:
patent: 5291169 (1994-03-01), Ige et al.
patent: 5410287 (1995-04-01), Laskaris et al.
patent: 5414360 (1995-05-01), Westphal et al.
patent: 5448214 (1995-09-01), Laskaris
patent: 5485088 (1996-01-01), Westphal et al.
Pending U.S. Patent Application Serial No. 08/418,229, filed Apr. 6, 1995, by K. G. Herd et al., entitled "Cryogenic Cooling System", US Patent 5,513,498.
Pending U.S. patent application Ser. No. 08/228,178, filed Aug. 10, 1994, by K. G. Herd, entitled "Remote Cooling System for a Superconducting Magnet".
Concurrently filed U.S. Patent Application RD-24637, by Bizhan Dorri et al, entitled "Cryogenic-Fluid-Cooled Open MRI Magnet with Uniform Magnetic Field", Ser. No. 08/547085, filed Oct. 23, 1995.

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