Intracardiac Flow at 4D CT: Comparison with 4D Flow MRI

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Biomedical Engineering

Background:

• Four-dimensional (4D) flow MRI is the reference standard for assessing intracardiac blood flow.
• Developing advanced CT techniques for similar assessments is crucial for broader clinical application.

Purpose of the Study:

• To compare the accuracy of four-dimensional (4D) flow CT with 4D flow MRI in evaluating intracardiac blood flow patterns.
• To determine the quantitative and qualitative similarities between the two imaging modalities.

Main Methods:

• Prospective study of 12 participants comparing 4D flow CT and 4D flow MRI data.
• Quantification of flow patterns, rates, stroke volume, kinetic energy, and flow components for both techniques.
• Comparison using linear regression and statistical analysis for correlation and variability.

Main Results:

• 4D flow CT demonstrated qualitatively similar cardiac flow patterns to 4D flow MRI, confirmed by observer grading.
• High correlations were found for peak flow rate (r=0.98), stroke volume (r=0.81), and kinetic energy at peak systole (r=0.95).
• Significant correlations were also observed for direct (r=0.93) and residual (r=0.87) flow components.

Conclusions:

• Four-dimensional flow CT provides a reliable assessment of intracardiac blood flow patterns.
• The quantitative and qualitative results from 4D flow CT are comparable to the established 4D flow MRI standard.
• 4D flow CT presents a promising alternative for detailed intracardiac hemodynamics evaluation.