Characterization of coupling in planar array coils with arbitrary element geometries

Abstract

A method is presented which rapidly characterizes the mutual impedance between elements in array coils for MR imaging as a function of offset distances between elements, These "coupling surfaces" allow the designer to quickly determine the overlap distances which minimize coupling between array elements.The method allows arbitrary element geometries and a layered, planar media. Additionally, because the Green's functions and current distributions are stored in Fourier space, the transverse fleld distributions are easily obtained, allowing the weighting coefficients form image combination to be determined.

Theory and application of array coils in MR spectroscopy

“…Two sets of calculated results are included, one set computed using the quasistatic approximations above, and the other using a somewhat more complete full-wave approach which uses the proper Green's function for the lossy medium. 71 All data was computed at 63 MHz, where this is a relatively large coil nearly a tenth of a free space wavelength in total conductor length. The current on the square loops was assumed to be constant in both methods.…”