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Abstract #1442

MultiPINS: PINS + MultiBand hybrid RF pulse with reduced SAR for SMS Imaging at Ultra High Field Strength

Cornelius Eichner 1,2 , Robert Turner 2 , Lawrence L Wald 1 , and Kawin Setsompop 1

1 Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, 2 Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Saxony, Germany

Simultaneous Multi Slice (SMS) acquisition enables increased temporal resolution and acquisition speed. However, at ultra high field strengths, SAR constraints of SMS RF pulses can enforce slower acquisition speed. We propose a novel MultiPINS RF pulse design that combines PINS and MultiBand pulses to achieve lower SAR. Slice profiles and off-resonance behavior of this pulse were evaluated using Bloch simulations. The MultiPINS pulse achieves similar slice profiles, but significantly reduced energy transmission and peak RF voltage. In-vivo high-resolution Blipped-CAIPI SMS diffusion MRI data with 3x multiband acceleration were acquired at 7T to show the usefulness of this new pulse design.

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