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Abstract #4727

Multi-shot multi-b-value diffusion-weighted imaging using EPI with keyhole and locally low-rank reconstruction

Xin Tang1 and Chenxi Hu1
1The Institute of Medical Imaging Technology, School of Biomedical Engineering, Shanghai Jiao Tong University (SJTU), Shanghai, China


A multi-b-value DWI imaging method based on multi-shot EPIK with continuously changing b values and Locally Low-Rank (LLR) constraint is proposed. The multi-shot EPIK acquisition improves resolution of multi-b-value DWI, and acquisition of the central k-space in every b-value bypasses the need for careful initialization. The LLR constrained problem is solved by a newly developed ADMM algorithm with robust performance. Preliminary data in healthy subjects showed that the proposed method outperforms LLR-POCS and SPA-LLR for reconstruction at high undersampling rates.

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