4D flow MRI
Pronunciation: four-D flow M-R-I
Time-resolved three-dimensional phase-contrast MRI technique that measures blood flow velocities in all spatial directions throughout the cardiac cycle.
Full Definition
4D flow MRI is an advanced cardiac imaging technique that provides comprehensive assessment of blood flow dynamics within the heart and great vessels. The method combines three-dimensional spatial encoding with time resolution (the fourth dimension) to measure velocity vectors in all three spatial directions throughout the cardiac cycle. This technique can quantify complex flow patterns, measure regurgitant volumes, assess wall shear stress, and visualize flow streamlines and vortices. 4D flow MRI is particularly valuable for evaluating congenital heart disease, valvular disorders, and aortic pathology where complex flow patterns are clinically relevant.
Usage
Usage note: Write as '4D flow MRI' not 'four-dimensional flow MRI' in technical contexts.
In Context
- "4D flow MRI demonstrated abnormal helical flow patterns in the ascending aorta." — Aortic flow assessment
- "The 4D flow sequence quantified mitral regurgitant volume at 45 mL per beat." — Valvular disease evaluation