Priti Balchandani1, John Pauly2, Daniel Spielman1
1Radiology, Stanford University, Stanford, CA, United States; 2Electrical Engineering, Stanford University, Stanford, CA, United States
Adiabatic 180 pulses may be used to replace conventional 180 pulses in spin echo sequences to provide greater immunity to the inhomogeneous B1-field at 7T. However, because the spectral profile of an adiabatic 180 pulse has non-linear phase, pairs of these pulses are used for refocusing, resulting in increased SAR and longer minimum echo times. We have used the adiabatic SLR method to generate a matched-phase 90 for an adiabatic 180 pulse to obviate the need for a second 180 pulse. The pulse pair was combined into a single self-refocused pulse to achieve the minimum echo time, and phantom and in vivo experiments were performed to validate pulse performance.