Patent ID: 6892440

Claim:
A method of forming a b-zero coil ( 40 , 42 , 44 , 46 , 48 and 50 ) about a superconducting main ( 20 , 22 , 24 26 , 28 and 30 ) coil for use in magnetic resonance imaging comprising the steps of providing a superconducting magnet coil ( 60 ); overlaying the superconducting magnet coil ( 60 ) with a layer of insulation material ( 62 ); winding a b-zero coil wire ( 70 ) into at least one layer about said insulation layer ( 62 ) to form a b-zero superconducing coil ( 40 , 42 , 44 , 46 , 48 and 50 ); co-winding with said b-zero coil wire ( 70 ) a second wire ( 80 ); wherein adjacent windings of such second wire ( 80 ) form a cavity ( 72 ) therebetween; and wherein adjacent windings of b-zero coil wire ( 70 ) lie within such cavity ( 72 ).