Hai
Zheng1, Tiejun Zhao2, Tamer Ibrahim1,
Fernando Emilio Boada1
1MR Research Center, University of
Pittsburgh, Pittsburgh, PA, United States; 2Siemens Medical
Systems, Malvern, PA, United States
High-performance
RF coils for high or ultra high field MRI often require the use of RF shields
that are in close proximity to the imaged volume. These shields can sometimes
generate Eddy-currents that are not adequately compensated for using the
pre-emphasis algorithm of the scanner and lead to severe distortions in the
desired excitation pattern. In this work, we introduce a simple yet effective
method for designing eddy-current-compensated parallel transmit RF pulses and
demonstrate its effectiveness using simulations as well as experimental data
at 7T.