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Journal Article

Real-time flow MRI of the aorta at a resolution of 40 msec.

MPS-Authors
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Joseph,  A.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Merboldt,  K. D.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Voit,  D.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Schätz,  S.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Zhang,  S.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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Frahm,  J.
Biomedical NMR Research GmbH, MPI for biophysical chemistry, Max Planck Society;

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2034421.pdf
(Publisher version), 526KB

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2034421-Suppl-1.doc
(Supplementary material), 19KB

2034421-Suppl-2.avi
(Supplementary material), 7MB

Citation

Joseph, A., Kowallick, J. T., Merboldt, K. D., Voit, D., Schätz, S., Zhang, S., et al. (2014). Real-time flow MRI of the aorta at a resolution of 40 msec. Journal of Magnetic Resonance Imaging, 40(1), 206-213. doi:10.1002/jmri.24328.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-CDDB-1
Abstract
PURPOSE: To evaluate a novel real-time phase-contrast magnetic resonance imaging (MRI) technique for the assessment of through-plane flow in the ascending aorta. MATERIALS AND METHODS: Real-time MRI was based on a radial fast low-angle shot (FLASH) sequence with about 30-fold undersampling and image reconstruction by regularized nonlinear inversion. Phase-contrast maps were obtained from two (interleaved or sequential) acquisitions with and without a bipolar velocity-encoding gradient. Blood flow in the ascending aorta was studied in 10 healthy volunteers at 3 T by both real-time MRI (15 sec during free breathing) and electrocardiogram (ECG)-synchronized cine MRI (with and without breath holding). Flow velocities and stroke volumes were evaluated using standard postprocessing software. RESULTS: The total acquisition time for a pair of phase-contrast images was 40.0 msec (TR/TE=2.86/1.93 msec, 10° flip angle, 7 spokes per image) for a nominal in-plane resolution of 1.3 mm and a section thickness of 6 mm. Quantitative evaluations of spatially averaged flow velocities and stroke volumes were comparable for real-time and cine methods when real-time MRI data were averaged across heartbeats. For individual heartbeats real-time phase-contrast MRI resulted in higher peak velocities for values above 120 cm s(-1) . CONCLUSION: Real-time phase-contrast MRI of blood flow in the human aorta yields functional parameters for individual heartbeats. When averaged across heartbeats real-time flow velocities and stroke volumes are comparable to values obtained by conventional cine MRI.