Nonlinear-Phase Multiband 90-180 RF Pair With Reduced Peak Power

Multiband RF pulses are central to the signal excitation in simultaneous multislice acquisitions. The peak amplitude has been a limiting factor in multiband RF design, especially in multiband spin-echo pulse design. In this work, nonlinear-phase multiband pulses, which have reduced peak power compared to linear-phase pulses, are designed. A pair of 90-180 nonlinear-phase multiband pulses are applied to generate a linear-phase echo. An additional reference phase is applied to each individual excited band to further reduce the peak power of the multiband pulse.

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