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Abstract #4120

Correction of Slice-Specific Nyquist Ghost Artifact for Simultaneous Multi-Slice EPI

Uten Yarach1 and Oliver Speck2

1Department of Radiologic Technology, Chiang Mai University, Chiang Mai, Thailand, 2Department of Biomedical Magnetic Resonance, Otto von Guericke University Magdeburg, Magdeburg, Germany

The slice-specific ghosting artifact has been challenging for SMS-EPI. A standard 1D-based phase correction usually leads to increased residual ghosting artifacts in case of subject motion or eddy current variations at different time points. In this study, we propose a dynamic 2D slice-specific phase correction to address the slice-specific phase error. This correction scheme does not require additional time for acquiring 2D phase difference scans. It is a combination between slice-GRAPPA and model-based framework. The result shows that the ghost-to-signal ratios for MB3Ry2 in human brain obtained by the proposed and vendor-provided reconstruction were 1.37% and 2.66%, respectively.

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