A Paired Phase and Magnitude Reconstruction for Advanced Diffusion-Weighted Imaging.
IEEE Trans Biomed Eng
; 70(12): 3425-3435, 2023 Dec.
Article
in En
| MEDLINE
| ID: mdl-37339044
ABSTRACT
OBJECTIVE:
Multi-shot interleaved echo planer imaging (Ms-iEPI) can obtain diffusion-weighted images (DWI) with high spatial resolution and low distortion, but suffers from ghost artifacts introduced by phase variations between shots. In this work, we aim at solving the ms-iEPI DWI reconstructions under inter-shot motions and ultra-high b-values.METHODS:
An iteratively joint estimation model with paired phase and magnitude priors is proposed to regularize the reconstruction (PAIR). The former prior is low-rankness in the k-space domain. The latter explores similar edges among multi-b-value and multi-direction DWI with weighted total variation in the image domain. The weighted total variation transfers edge information from the high SNR images (b-value = 0) to DWI reconstructions, achieving simultaneously noise suppression and image edges preservation.RESULTS:
Results on simulated and in vivo data show that PAIR can remove inter-shot motion artifacts very well (8 shots) and suppress the noise under the ultra-high b-value (4000 s/mm2) significantly.CONCLUSION:
The joint estimation model PAIR with complementary priors has a good performance on challenging reconstructions under inter-shot motions and a low signal-to-noise ratio.SIGNIFICANCE:
PAIR has potential in advanced clinical DWI applications and microstructure research.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Brain
/
Echo-Planar Imaging
Language:
En
Journal:
IEEE Trans Biomed Eng
Year:
2023
Document type:
Article