Yudong Zhu1, Cem Deniz1, Leeor
Alon1, Hans-Peter Fautz2, Daniel Sodickson1
1New
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.