Abstract #2931
Correction of Artifacts Caused by Transient Eddy Currents In Simultaneous Multi-Slice dMRI
Rafael O'Halloran 1 , Chen Yang 1 , and Junqian Xu 1
1
Radiology, Icahn School of Medicine at Mt
Sinai, New York, NY, United States
In Simultaneous multi-slice (SMS) middle slices are
inevitably acquired at the beginning of each
diffusion-encoded volume, making SMS more sensitive to
artifacts due to transient eddy currents than
conventional diffusion-weighted MRI (dMRI). In
conventional dMRI slices affected by transient eddy
currents are often at the edge of the slice group and
can be safely ignored. In SMS, however, the majority of
the simultaneously excited slices are in the middle of
the slice group and transient eddy currents cause the
slices in the initial a few excitations to have
different geometric distortions than the slices in the
later excitations, when eddy currents have achieved
steady state. In this work the artifact is explained and
demonstrated in scans of a phantom and human brain. A
simple post-processing correction is proposed and
demonstrated to be effective in correcting the artifact.
The importance of realizing and addressing this artifact
is heightened by the number of studies using SMS dMRI.
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