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Related Experiment Video

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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
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Evaluating a Phase-Specific Approach to Aortic Flow: A 4D Flow MRI Study.

Mitch J F G Ramaekers1,2,3,4, Jos J M Westenberg4, Max F G H M Venner2

  • 1Department of Radiology and Nuclear Medicine, Maastricht University Medical Center+, Maastricht, The Netherlands.

Journal of Magnetic Resonance Imaging : JMRI
|June 13, 2023
PubMed
Summary

Static 4D flow MRI segmentation is comparable to multiphase methods for aortic flow parameters, simplifying analysis. However, multiphase quantification is crucial for accurately assessing peak values of these parameters.

Keywords:
4D flow MRIMRIaortablood flow

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Area of Science:

  • Cardiovascular imaging and fluid dynamics.
  • Medical physics and biomedical engineering.

Background:

  • Quantifying aortic flow parameters using 4D flow MRI is essential.
  • Limited data exist on how analysis methods affect these parameters and their systolic evolution.

Purpose of the Study:

  • To evaluate multiphase segmentation and quantification of flow parameters in aortic 4D flow MRI.
  • To compare static versus phase-specific segmentation methods.

Main Methods:

  • Prospective study involving 40 healthy volunteers and 10 patients with thoracic aortic aneurysm.
  • 4D flow MRI (velocity encoded turbo field echo sequence, 3T) was used.
  • Phase-specific segmentations of the aorta were performed, calculating time to peak, peak, and time-averaged values for various flow parameters.

Main Results:

  • Static and phase-specific segmentations showed comparable results for velocity and vorticity in the aortic root and ascending aorta.
  • Vorticity, helicity, and energy loss peaked later than flow rate in the aorta.
  • Time-averaged velocity and vorticity correlated significantly across all aortic segments.

Conclusions:

  • Static 4D flow MRI segmentation provides comparable results to multiphase segmentation for many flow parameters, reducing analysis time.
  • Multiphase quantification remains necessary for precise assessment of peak flow-related parameters in the aorta.