Performance Optimization of a Multi-Channel Transmit Coil with Significant Coupling Between Elements

Mikhail Kozlov¹, Robert Turner¹

We present an analysis of a commercial available 7T 8-ch coil. Despite significant coupling (Sxy≈7 dB) between neighboring elements, the coil can be tuned either to prevent power splitting, or to achieve minimum reflected power. The latter tuning condition corresponds to the best coil performance regarding achievable B1+ magnitude for a given coil input power.