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Abstract

An edge-wound NMR solenoidal sample coil is made by winding at least two turns of flattened wire around a cylindrical coilform such that the major cross-sectional axis of the flat wire is perpendicular to the axis of the solenoid. The space between turns near the center is greater than the space between turns at the ends but less than the major cross-sectional dimension of the flat wire. The flattened wire is magnetically compensated by forming copper tubing around paramagnetic wires. The resulting solenoid has considerably higher .eta..sub.F Q and B.sub.1 homogeneity than prior-art solenoids of comparable size and transverse transparency. Similar principles may be used to improve the segmented, transparent, loop-gap resonator for breast and other imaging applications by using segmented planar ring resonators, tightly coupled by means of balanced transmission lines at the magic angle, with outermost conductive surfaces oriented more in the radial than axial direction. Similar principles may also be used to produce an improved, segmented, conical surface coil.

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First Claim