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
Martinos Center for Biomedical Imaging,
Massachusetts General Hospital, Charlestown, MA, United
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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