Martin Haas1, Jeff Snyder1, Peter Ullmann2, Jrgen Hennig1, Maxim Zaitsev1
1Department of Radiology
Multi-dimensionally selective RF excitation suffers from artifacts related to the typically long pulse duration. In particular, applications in MR spectroscopy would significantly benefit from shorter pulses due to increased bandwidth. Previous approaches to mitigate this problem using segmented selective excitation across several repetitions have been limited to small tip angles. In this work, a segmented RF design algorithm for large tip angle pulses, with additional parallel transmit acceleration, is described for multi-dimensionally selective excitation and demonstrated in simulations and a phantom. The method is based on a segment-wise optimal control optimization and not limited to 2D or a particular segmentation.