Yudong Zhu1, Cem Deniz1, Leeor Alon1, Hans-Peter Fautz2, Daniel Sodickson1
The efficiency of a conventional transmit coil is commonly evaluated based on amplitude of the created B1 field or spin flip angle given a certain input power. However it is not yet clear how the efficiency of a transmit array could be evaluated. This may be attributed to the shear number of possible weighting configurations (induced statically by B1 shimming coefficients or dynamically by parallel RF pulses) in driving individual Tx channels or ports. We hereby present an efficiency metric that is an extension of the conventional efficiency metric, and is as practical to quantify as is the conventional metric.