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  Advances in real-time phase-contrast flow MRI using asymmetric radial gradient echoes.

Untenberger, M., Tan, Z., Voit, D., Joseph, A. A., Roeloffs, V. B., Merboldt, K. D., et al. (2016). Advances in real-time phase-contrast flow MRI using asymmetric radial gradient echoes. Magnetic Resonance in Medicine, 75(5), 1901-1908. doi:10.1002/mrm.25696.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CE5E-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-81C0-C
Genre: Journal Article

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 Creators:
Untenberger, M.1, Author              
Tan, Z., Author
Voit, D.1, Author              
Joseph, A. A.1, Author              
Roeloffs, V. B.1, Author              
Merboldt, K. D.1, Author              
Schätz, S.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: asymmetric echo; nonlinear inverse reconstruc- tion; cardiovascular blood flow; phase-contrast flow MRI; radial MRI; real-time MRI
 Abstract: Purpose: To provide multidimensional velocity compensation for real-time phase-contrast flow MRI. Methods: The proposed method introduces asymmetric gradi- ent echoes for highly undersampled radial FLASH MRI with phase-sensitive image reconstruction by regularized nonlinear inversion (NLINV). Using an adapted gradient delay correction the resulting image quality was analyzed by simulations and experimentally validated at 3 Tesla. For real-time flow MRI the reduced gradient-echo timing allowed for the incorporation of velocity-compensating waveforms for all imaging gradients at even shorter repetition times. Results: The results reveal a usable degree of 20% asymme- try. Real-time flow MRI with full velocity compensation elimi- nated signal void in a flow phantom, confirmed flow parameters in healthy subjects and demonstrated signal recovery and phase conservation in a patient with aortic valve insufficiency and stenosis. Exemplary protocols at 1.4–1.5 mm resolution and 6 mm slice thickness achieved total acquisition times of 33.3–35.7 ms for two images (7 spokes each) with and without flow-encoding gradient. Conclusion: Asymmetric gradient echoes were successfully implemented for highly undersampled radial trajectories. The resulting temporal gain offers full velocity compensation for real-time phase-contrast flow MRI which minimizes false- positive contributions from complex flow and further enhances the temporal resolution compared with acquisitions with symmetric echoes.

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Language(s): eng - English
 Dates: 2015-06-222016-05
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.25696
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 75 (5) Sequence Number: - Start / End Page: 1901 - 1908 Identifier: -