Abstract #0912
Hyperbolic Secant RF Pulses for Simultaneous Multi-Slice Excitation with Reduced Susceptibility Artifacts
Mehran Baboli 1 , Bastien Guerin 2 , Lawrence Wald 2 , and V. Andrew Stenger 1
1
Medicine, University of Hawaii, Honolulu,
Hawaii, United States,
2
Radiology,
Massachusetts General Hospital, Massachusetts, United
States
Hyperbolic Secant (HS) RF pulses can be used to generate
a quadratic phase in the slice-select direction to
reduce susceptibility induced signal dropout in regions
including the frontal lobe of brain and are useful for
applications such as fMRI. Recently simultaneous
multi-slice (SMS) imaging techniques have been shown to
provide speed increases by factors up to 12 in fMRI
applications. Typically SMS excitation is accomplished
by using a modulated sinc RF pulse. Additionally the
Power Independent Number of Slices (PINS) pulse design
has been proposed for low power SMS excitation using a
series of non-selective pulses separated by z-gradient
blips. This study demonstrates both modulated sinc and
PINS SMS excitations weighted by an HS envelope to
reduce susceptibility artifacts in the brain at 3T.
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