Keywords: RF Arrays & Systems, RF Arrays & Systems
Motivation: Literature does not provide a comprehensive comparison of different Tx coils' voxel-wise power and SAR efficiency as well as RF-shimming performance for 7T head imaging using a large diameter Tx coil.
Goal(s): For nine Tx coils, voxel-wise power and SAR efficiency and RF-shimming performance were investigated to find a optimal Tx coil type for 7T head imaging.
Approach: For each coil, the power and SAR efficiency were calculated and compared voxel-by-voxel. L-curves were calculated to evaluate the RF-shimming performance.
Results: It was shown that loop-based coils were superior in power and SAR efficiency. The RF-shimming performance was slightly better for dipole-based Tx arrays.
Impact: This work demonstrates the potential of different large diameter Tx coil arrays and should help other researchers who want to build a large diameter Tx coil to decide on a suitable coil type.
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