1Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, 2Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, United States
Two-dimensional (2D) adiabatic pulses based on sampling k-space have previously been developed using amplitude
modulation in one orthogonal direction and frequency modulation in the other2. Here, a new method for designing two and
three-dimensional adiabatic pulses using a sub-pulse approach is introduced.
Namely, a parent adiabatic pulse is divided into sub-pulse elements, each of
which is a 2D selective pulse. Using this approach, selective excitation is
achieved through the 2D pulse while being adiabatically driven by the parent
adiabatic pulse. This can be extended to three-dimensions by applying blips
along the remaining direction between sub-pulses. Simulation and experimental
results are presented, confirming the validity of this approach.