Abstract #3775
Artifact Associated with Fat Suppression in Spin-Echo EPI
Yasha Khatamian 1 and J. Jean Chen 1
1
Rotman Research Institute, Toronto, Ontario,
Canada
This study investigated a fat-related artifact that
occurs when spectral-fat saturation is used with
spin-echo EPI. This artifact was detected in humans and
phantoms for a variety of imaging parameter settings,
was significant compared to task associated signal
changes, diminished with longer TR as well as fewer
slices, and exhibited a power spectrum with a single
broad peak at 0.133/TR Hz. This finding is relevant for
all spin-echo EPI experiments, including fMRI and DTI.
While further investigation is required to understand
the mechanisms causing this artifact, water excitation
is recommended for acquiring fat-free images with
spin-echo EPI.
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