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Abstract #1388

Characterization of k-space trajectory error using time delay correction for EPI

Yi-Cheng Hsu1,2, Ying-Hua Chu1,2, Maxim Zaitsev2, and Fa-Hsuan Lin1,3

1Institute of Biomedical Engineering, National Taiwan University, Taipei, Taiwan, 2Medical Physics, Department of Radiology, University Medical Center Freiburg, Freiburg, Germany, 3Department of Neuroscience and Biomedical Engineering, Aalto University, Espoo, Finland

The ghosting artifacts in echo-planar imaging can be greatly reduced by aligning the k-space coordinates between odd and even lines based on their relative time delay. However, we found this approach is limited in artifact reduction. Specifically, we found that the image still has prominent artifacts and high spatial frequency k-space coordinates for even and odd lines still differ from each other significantly after time delay correction. This result suggested the origin of the ghosting artifact is beyond the time delays between neighboring readouts. The image artifact, however, can be greatly reduced using trajectory correction.

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