Abstract
A new mathematical treatment and algorithm for the design of |B1+|-selective RF excitation pulses is presented and validated. The algorithm is based on a rotated Shinnar–Le Roux pulse design algorithm, wherein the pulse’s frequency modulation waveform is directly designed by the algorithm, and its amplitude and sign modulation waveform takes the place of the gradient field. A new pulse configuration is described that enables excitation of large tip-angle slice-selective profiles. Experiments were performed to validate the pulses, and simulations were performed to characterize the pulses’ sensitivity to off-resonance, and to compare them to adiabatic (BIR-4) pulses.
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