Abstract #0442
Artifact-free T2* mapping without post hoc corrections
Pippa Storey 1 , Yvonne W. Lui 1 , and Dmitry S. Novikov 1
1
Radiology Department, New York University
School of Medicine, New York, NY, United States
Macroscopic susceptibility differences are a frequent
source of artifacts in T2* mapping, and post hoc
correction methods are often cumbersome or inaccurate.
We demonstrate that Fourier encoding is largely
insensitive to macroscopic phase gradients up to a
threshold determined by the Nyquist limit. Accurate T2*
maps can thus be obtained without post hoc correction
simply by acquiring data in 3D mode and truncating the
echo train where the local phase gradient exceeds the
threshold. This approach produces uniform T2* maps in
phantoms despite the presence of a ferromagnetic object,
and artifact-free T2* maps of the brain even near the
sinuses.
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