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Shielded and open MRI magnet

  • US 5,565,831 A
  • Filed: 10/23/1995
  • Issued: 10/15/1996
  • Est. Priority Date: 10/23/1995
  • Status: Expired due to Fees
First Claim
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1. An open magnetic resonance imaging magnet comprising:

  • a) a first superconductive coil assembly including;

    (1) a generally toroidal-shaped first coil housing surrounding a first bore and having a generally longitudinal first axis;

    (2) a generally annular-shaped first superconductive main coil generally coaxially aligned with said first axis, disposed within said first coil housing, and carrying a first main electric current in a first direction; and

    (3) a generally annular-shaped first superconductive shielding coil generally coaxially aligned with said first axis, disposed within said first coil housing, and carrying a first shielding electric current in a direction opposite to said first direction, wherein said first superconductive shielding coil is spaced radially outward and radially apart from said first superconductive main coil; and

    b) a second superconductive coil assembly including;

    (1) a generally toroidal-shaped second coil housing longitudinally spaced apart from said first coil housing, surrounding a second bore, and having a generally longitudinal second axis generally coaxially aligned with said first axis;

    (2) a generally annular-shaped second superconductive main coil generally coaxially aligned with said second axis, disposed within said second coil housing, and carrying a second main electric current in said first direction; and

    (3) a generally annular-shaped second superconductive shielding coil generally coaxially aligned with said second axis, disposed within said second coil housing, and carrying a second shielding electric current in said opposite direction, wherein said second superconductive shielding coil is spaced radially outward and radially apart from said second superconductive main coil.

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