Fig. 4.

Interdigitated capacitor probe array: coronal (left) and sagittal (right) (a) simulated $\mid {\mathrm{B}}_1^{+}\mid$ efficiency, (b) measured GRE images, and (c) measured $\mid {\mathrm{B}}_1^{+}\mid$ efficiency inside of cylindrical phantom. 60° incremental phasing with equal magnitude excitation on the interdigitated capacitor probes. Geometric distortions (barreling aspect) of $\mid {\mathrm{B}}_1^{+}\mid$ are due to uncorrected non-linearity of the gradient coils.