Motion-robust reconstruction of multishot diffusion-weighted images without phase estimation through locally low-rank regularization.

Motion-robust reconstruction of multishot diffusion-weighted images without phase estimation through locally low-rank regularization.
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DOI:
10.1002/mrm.27488
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发表时间:
2019-03
影响因子:
3.3
通讯作者:
Hargreaves BL
Hargreaves BL
中科院分区:
医学3区
文献类型:
--
作者:
Hu Y;Levine EG;Tian Q;Moran CJ;Wang X;Taviani V;Vasanawala SS;McNab JA;Daniel BA;Hargreaves BL

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The goal of this work is to propose a motion robust reconstruction method for diffusion-weighted MRI that resolves shot-to-shot phase mismatches without using phase estimation. Assuming shot-to-shot phase variations are slowly varying, spatial-shot matrices can be formed using a local group of pixels to form columns, where each column is from a different shot (excitation). A convex model with a locally low-rank constraint on the spatial-shot matrices is proposed. In-vivo brain and breast experiments were performed to evaluate the performance of the proposed method. The proposed method shows significant benefits when the motion is severe, e.g. for breast imaging. Further, the resulting images can be used for reliable phase estimation in the context of phase-estimation-based methods to achieve even higher image quality. We introduced shot-LLR, a reconstruction method for multi-shot diffusion-weighted MRI without explicit phase estimation. In addition, its motion robustness can be beneficial to neuroimaging and body imaging.
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