Patent ID: 6060882
Filing Date: 2000-05-09
Classification: G01R

Abstract:
A litz coil formed on the surface of a substantially elliptical coilform for use in a main polarizing magnetic field B.sub.Z for magnetic resonance for the purpose of generating or detecting rf B.sub.1 transverse to the axis of said coilform in, for example, the y-direction inside an external rf shield, said litz coil comprising:a litz group comprising multiple, parallel, conductor foils having interwoven sub-routes from a first node to a second node and insulated crossovers such that at least two well-defined flux sub-windows are formed,a first litz semi-coil on the +y side of said coilform comprising at least one litz group and a series-parallel combination of conductors forming axial and azimuthal conductor elements around a central flux window centered on the +y axis,a second substantially equivalent litz semi-coil on the -y side of said coilform with electrical coupling means to said first litz semi-coil,said first litz semi-coil further characterized as having leads for connecting to a tuning capacitor,said sub-routes positioned such that when said litz coil is driven by rf current at a predetermined frequency the total rf magnetic flux through said central flux window is less than 50% of the total rf magnetic flux through the y=0 plane.