Motion artifact reduction technique for dual-contrast FSE imaging

There is considerable similarity between proton density-weighted (PDw) and T2-weighted (T2w) images acquired by dual-contrast fast spin-echo (FSE) sequences. The similarity manifests itself in image space as consistency between the phases of PDw and T2w images and in k-space as correspondence betwee...

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Bibliographic Details
Published in:Magnetic resonance imaging 2002-07, Vol.20 (6), p.455-462
Main Authors: Kholmovski, Eugene G., Samsonov, Alexei A., Parker, Dennis L.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Brain - anatomy & histology
Dual-contrast fast spin-echo
Humans
Image Processing, Computer-Assisted
Investigative techniques, diagnostic techniques (general aspects)
Magnetic resonance imaging
Magnetic Resonance Imaging - methods
Medical sciences
Motion
Motion artifact
Nervous system
Phantoms, Imaging
Phase encoding scheme
POCS
Radiodiagnosis. Nmr imagery. Nmr spectrometry
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Summary:There is considerable similarity between proton density-weighted (PDw) and T2-weighted (T2w) images acquired by dual-contrast fast spin-echo (FSE) sequences. The similarity manifests itself in image space as consistency between the phases of PDw and T2w images and in k-space as correspondence between PDw and T2w k-space data. A method for motion artifact reduction for dual-contrast FSE imaging has been developed. The method uses projection onto convex sets (POCS) formalism and is based on image space phase consistency and the k-space similarity between PDw and T2w images. When coupled with a modified dual-contrast FSE phase encoding scheme the method can yield considerable artifact reduction, as long as less than half of the acquired data is corrupted by motion. The feasibility and efficiency of the developed method were demonstrated using phantom and human MRI data.
ISSN:0730-725X
1873-5894
DOI:10.1016/S0730-725X(02)00526-X