Abstract #4125

Robust Virtual Coil SAKE with Automatic Rank Thresholding for Removal of EPI Ghost Artifacts

Zhenda Xu^1,2, Mengye Lyu^1,2, Yilong Liu^1,2, Markus Barth³, and Ed X. Wu^1,2

¹Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, China, ²Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China, ³Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia

Ghost artifacts in EPI can arise from phase error between positive- and negative-echo and inter-shot phase error. Virtual coil SAKE (VC-SAKE) can be used to eliminate these phase errors simultaneously, but its performance relies on selection of parameters. In particular, proper rank thresholding is extremely important. In this study, we proposed to automatically determine the optimal rank threshold by minimizing the image entropy, and evaluated its performance with various datasets from different scanner systems.

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