Compressed sensing for chemical shift-based water-fat separation

Multi echo chemical shift‐based water–fat separation methods allow for uniform fat suppression in the presence of main field inhomogeneities. However, these methods require additional scan time for chemical shift encoding. This work presents a method for water–fat separation from undersampled data (...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2010-12, Vol.64 (6), p.1749-1759
Main Authors: Doneva, Mariya, Börnert, Peter, Eggers, Holger, Mertins, Alfred, Pauly, John, Lustig, Michael
Format: Article
Language:English
Subjects:
3D imaging
Abdomen - anatomy & histology
Adipose Tissue - anatomy & histology
Algorithms
Body Water
compressed sensing
Humans
Image Enhancement - methods
Image Processing, Computer-Assisted
Imaging, Three-Dimensional
Knee - anatomy & histology
Least-Squares Analysis
Magnetic Resonance Imaging - methods
MR imaging
Poisson Distribution
Retrospective Studies
water-fat separation
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Summary:Multi echo chemical shift‐based water–fat separation methods allow for uniform fat suppression in the presence of main field inhomogeneities. However, these methods require additional scan time for chemical shift encoding. This work presents a method for water–fat separation from undersampled data (CS‐WF), which combines compressed sensing and chemical shift‐based water–fat separation. Undersampling was applied in the k‐space and in the chemical shift encoding dimension to reduce the total scanning time. The method can reconstruct high quality water and fat images in 2D and 3D applications from undersampled data. As an extension, multipeak fat spectral models were incorporated into the CS‐WF reconstruction to improve the water–fat separation quality. In 3D MRI, reduction factors of above three can be achieved, thus fully compensating the additional time needed in three‐echo water–fat imaging. The method is demonstrated on knee and abdominal in vivo data. Magn Reson Med, 2010. © 2010 Wiley‐Liss, Inc.
ISSN:0740-3194
1522-2594
1522-2594
DOI:10.1002/mrm.22563