Application of time-optimal Simultaneous Multi-Slice refocusing to TSE/RARE
Christoph Stefan Aigner1, Armin Rund2,3, Berkin Bilgic4,5, Borjan Gagoski6, Kawin Setsompop4,5, Karl Kunisch2, and Rudolf Stollberger1
1Institute of Medical Engineering, Graz University of Technology, Graz, Austria, 2Institute for Mathematics and Scientific Computing, University of Graz, Graz, Austria, 3BioTechMed Graz, Graz, Austria, 4Massachusetts General Hospital, Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 5Harvard Medical School, Boston, MA, United States, 6Department of Radiology, Boston Children's Hospital, Boston, MA, United States
RF pulses for Simultaneous Multi-Slice imaging (SMS) are still limited by hardware and safety requirements leading to lengthy pulse durations. In this work we apply a bi-level time-optimal control method to design a minimum time SMS refocusing pulse for a multiband factor of 15 with 1mm slice thickness resulting in a refocusing duration of 4.58ms, which is 1.7x shorter than the state of the art MultiPINS pulse. The optimized RF pulse and the corresponding shaped slice selective gradient are tested in-vivo in a T2-TSE SMS wave-CAIPI scan of the whole head in 70s.
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