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Abstract #4125

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

Zhenda Xu1,2, Mengye Lyu1,2, Yilong Liu1,2, Markus Barth3, and Ed X. Wu1,2

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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