Patent ID: 6130537
Filing Date: 2000-10-10
Classification: G01R

Abstract:
An NMR probe for use in an external field B.sub.0 in the z direction, said probe comprising:a cylindrical dielectric coilform not aligned with the z axis,an rf coil wrapped around said coilform capable of producing B.sub.1 perpendicular to the plane defined by the axis of said coilform and the z axis,said coil further characterized as comprising two substantially equivalent half-turn semicoils on opposite sides of said coilform,said half-turn semicoil characterized in that a major fraction of the total current around the B.sub.1 axis in said semicoil is interrupted by series capacitances of comparable magnitude at exactly two locations in its path around the B.sub.1 axis,said series capacitances each comprising two effectively paralleled capacitors wherein the rf voltage phase at said effectively paralleled tuning capacitors is substantially equal at the intended frequency of operation,said paralleled capacitors positioned individually at substantially equal axial and radial positions near each end of said semicoil,said rf coil further characterized in that the mean subtended azimuthal angle between said paralleled capacitors is greater than 50.degree. and less than 100.degree..