In this work, we investigated the performance differences between a flexible single-gap coaxial coil operated far above self-resonance and a double-gap coaxial coil operated on self-resonance at 7T. Based on electromagnetic simulations and MRI results it is demonstrated that in the single-gap design the current distribution on the outside of the coaxial shield is strongly inhomogeneous. This leads to a strong dependence of the Tx performance on the coil orientation relative to B0. In contrast, the double-gap design results in homogeneous current distribution and orientation-independent Tx performance.
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