Patent ID: 6064290
Filing Date: 2000-05-16
Classification: G01R

Abstract:
An electromagnet for providing a homogeneous magnetic field in a field of view, comprising:a) at least two circular coils having centers contained within a first hollow cylindrical region disposed coaxial with an axis, wherein the first region has an inner radius R1a in the range of 45-60 centimeters, an outer radius R1b in the range of 60-80 centimeters, and a length L1 in the range of 40-100 centimeters;b) at least two circular coils having centers contained within a second cylindrical region disposed coaxial with the axis, wherein the second region has an inner radius R2a in the range of 22.5-42 centimeters, an outer radius R2b in the range of 45-60 centimeters, and a length L2 in the range of 20-40 centimeters;wherein the outer radius R2b of the second region is shorter than the inner radius R1a of the first region; andwherein there are no coils outside the first region and the second region that reinforce a magnetic field in the field of view.