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  Spatiotemporal phase unwrapping for real-time phase-contrast flow MRI

Untenberger, M., Hüllebrand, M., Tautz, L., Joseph, A. A., Voit, D., Merboldt, K. D., et al. (2015). Spatiotemporal phase unwrapping for real-time phase-contrast flow MRI. Magnetic Resonance in Medicine, 74(4), 964-970. doi:10.1002/mrm.25471.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CD83-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-22EB-0
Genre: Journal Article

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2154986.pdf (Publisher version), 747KB
 
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 Creators:
Untenberger, M.1, Author              
Hüllebrand, M., Author
Tautz, L., Author
Joseph, A. A.1, Author              
Voit, D.1, Author              
Merboldt, K. D.1, Author              
Frahm, J.1, Author              
Affiliations:
1Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society, ou_578634              

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Free keywords: flow MRI; real-time MRI; velocity-encoded MRI; phase-contrast MRI; phase unwrapping
 Abstract: Purpose: To develop and evaluate a practical phase unwrapping method for real-time phase-contrast flow MRI using temporal and spatial continuity. Methods: Real-time phase-contrast MRI of through-plane flow was performed using highly undersampled radial FLASH with phase-sensitive reconstructions by regularized nonlinear inversion. Experiments involved flow in a phantom and the human aorta (10 healthy subjects) with and without phase wrapping for velocity encodings of 100 cms1 and 200 cms1. Phase unwrapping was performed for each individual cardiac cycle and restricted to a region of interest automatically propagated to all time frames. The algorithm exploited temporal continuity in forward and backward direction for all pixels with a “continuous” representation of blood throughout the entire cardiac cycle (inner vessel lumen). Phase inconsistencies were corrected by a comparison with values from direct spatial neighbors. The latter approach was also applied to pixels exhibiting a discontinuous signal intensity time course due to movement-induced spatial displacements (peripheral vessel zone). Results: Phantom and human flow MRI data were successfully unwrapped. When halving the velocity encoding, the velocity-to-noise ratio (VNR) increased by a factor of two. Conclusion: The proposed phase unwrapping method for real-time flow MRI allows for measurements with reduced velocity encoding and increased VNR.

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Language(s): eng - English
 Dates: 2014-10-102015-10
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.25471
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 74 (4) Sequence Number: - Start / End Page: 964 - 970 Identifier: -