Abstract #3843

Application of time-optimal Simultaneous Multi-Slice refocusing to TSE/RARE

Christoph Stefan Aigner¹, Armin Rund^2,3, Berkin Bilgic^4,5, Borjan Gagoski⁶, Kawin Setsompop^4,5, 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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