Abstract #3421

EPI Nyquist Ghost Correction by Iteratively Enforcing Structural Low Rankness

Yilong Liu¹, Mengye Lyu², Yunlin Zhao¹, Linfang Xiao³, and Ed X. Wu^4,5

¹Guangdong-Hongkong-Macau Institute of CNS Regeneration, Key Laboratory of CNS Regeneration (Ministry of Education), Jinan University, Guangzhou, China, ²College of Health Science and Environmental Engineering, Shenzhen Technology University, Shenzhen, China, ³Hangzhou Weiying Medical Technology Co., Ltd, Hangzhou, China, ⁴Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, China, ⁵Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China

Synopsis

Keywords: Artifacts, Artifacts, EPI, Nyquist ghost correctionThis study presents a Nyquist ghost correction method by iteratively enforcing low rankness of the block-wise Hankel matrix and updating the 1D linear model for phase correction. The proposed method was evaluated with multi-shot EPI data at both ultra-high field (7T) and low field (0.3T). Compared with existing SVD-based method, the proposed method requires much fewer iterations to achieve similar performance, provides a computationally efficient and robust solution to EPI Nyquist ghost correction.

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