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An alternative preprocessing workflow for four-dimensional flow MRI (4D flow MRI) significantly improved data consistency and segmentation quality. This method enhances flow quantification and mass conservation in abdominal imaging.

Keywords:
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Area of Science:

  • Medical Imaging
  • Cardiovascular Imaging
  • Magnetic Resonance Imaging

Background:

  • Four-dimensional flow MRI (4D flow MRI) is crucial for assessing cardiovascular hemodynamics.
  • Data consistency in 4D flow MRI is vital for accurate flow quantification.
  • Conventional preprocessing workflows may introduce inconsistencies in abdominal 4D flow MRI data.

Purpose of the Study:

  • To evaluate the impact of an alternative preprocessing workflow on abdominal 4D flow MRI data consistency.
  • To compare the efficacy of a novel workflow against a conventional one for noncontrast- and contrast-enhanced scans.
  • To optimize vessel segmentation and flow quantification in patients with cirrhosis and portal hypertension.

Main Methods:

  • Twenty patients with cirrhosis and portal hypertension underwent 3.0T 4D flow MRI before and after contrast administration.
  • Data were preprocessed using a conventional workflow (noise filters first) and an alternative workflow (eddy current correction first).
  • Vessel segmentation quality, flow quantification, and conservation of mass were assessed and compared between workflows.

Main Results:

  • The alternative workflow (workflow 2) demonstrated significantly higher vessel segmentation quality (P < 0.05) with excellent interobserver agreement (κ = 0.92).
  • Workflow 2 yielded larger flow values (P < 0.05) and improved conservation of mass (7.3% vs. 27.7% for portal, P < 0.001).
  • Noncontrast acquisitions with the alternative workflow also showed improved mass conservation (5.8% vs. 8.7% for portal, P = 0.05).

Conclusions:

  • Applying eddy current correction before other manipulations, cautious noise masking, and anti-aliasing optimizes abdominal 4D flow MRI data consistency.
  • The alternative preprocessing workflow significantly enhances segmentation quality and flow quantification accuracy.
  • Noncontrast acquisitions, when preprocessed with the improved workflow, offer superior mass conservation in abdominal 4D flow MRI.