Cryogen-cooled open MRI superconductive magnet

Details Cryogen-cooled open MRI superconductive magnet Cryogen-cooled open MRI superconductive magnet

1995-11-13

1996-10-08

Brown, Brian W.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Superconductive type

62 511, 324318, 505893, H01F 722

Patent

active

055635660

ABSTRACT:
An open magnetic resonance imaging (MRI) magnet having longitudinally spaced-apart superconductive main coils surrounded by a dewar containing a cryogenic liquid (e.g., liquid helium) and boiled-off cryogenic gas (e.g., helium vapor). A condenser is in physical contact with the boiled-off vapor and is in thermal contact with a cold stage of a cryocooler coldhead so as to re-liquefy the vapor. This allows the coils to be surrounded by a single (not double) thermal shield which allows the coils structurally 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: 5381122 (1995-06-01), Laskaris et al.
patent: 5410286 (1995-04-01), Herd et al.
patent: 5410287 (1995-04-01), Laskaris et al.
patent: 5414360 (1995-05-01), Westphal et al.
patent: 5442928 (1995-08-01), Laskaris et al.
patent: 5448214 (1995-09-01), Laskaris
patent: 5485088 (1996-01-01), Westphal et al.
Recently filed U.S. patent application RD-24637, by E. T. Laskaris et al., entitled "Open MRI Superconductive Magnet with Cryogenic Fluid Cooling", Ser. No. 08/547085.
Recently filed U.S. patent application RD-24684, by E. T. Laskaris et al., entitled "Open MRI Superconductive Magnet with Cryogenic Fluid Cooling", Ser. No. 08/553738.

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