Abstract #0208

The Effects of Navigator Distortion Level on Interleaved EPI DWI Reconstruction: A Comparison between Image and K-space Based Method

Erpeng Dai¹, Xiaodong Ma¹, Zhe Zhang¹, Chun Yuan^1,2, and Hua Guo¹

¹Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China, People's Republic of, ²Vascular Imaging Laboratory, Department of Radiology, University of Washington, Seattle, WA, United States

One of the challenges for interleaved EPI (iEPI) DWI is the phase inconsistency among different shots. Several methods, performed either in the image or k-space domain, have been proposed to solve this problem with extra acquired navigator data. However, the navigator is usually acquired with a lower bandwidth in the phase encoding direction than the image echo, which can cause different distortion levels. In this study, the effects of such distortion for the image or k-space based reconstruction are investigated. It has been shown that the k-space based method is more tolerant to the navigator distortion.

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