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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
Published on: February 25, 2022
Clinical applications of 4D flow magnetic resonance imaging in hepatic vascular disorders: practical biomarkers,
Hanxiang Liu1, Lingyun Xu1, Jing Yang2
1School of Medical Imaging, Xuzhou Medical University, Xuzhou, China.
Insights
Four-dimensional flow MRI offers comprehensive hemodynamic assessment for hepatic vascular disorders, overcoming limitations of traditional imaging methods. This advanced technique provides detailed flow and pressure data, improving diagnosis and management of complex liver conditions.
Area of Science:
- Medical Imaging
- Cardiovascular Imaging
- Hepatology
Background:
- Hepatic vascular disorders encompass conditions like portal hypertension and Budd-Chiari syndrome.
- Current imaging modalities (Doppler ultrasound, CTA, DSA) have limitations in comprehensive hemodynamic assessment.
- Accurate hemodynamic evaluation is crucial for understanding disease progression and treatment efficacy.
Purpose of the Study:
- To review the technical foundations, processing steps, and clinical applications of 4D flow MRI in hepatic vascular disorders.
- To highlight the advantages of 4D flow MRI over conventional imaging techniques for hemodynamic assessment.
- To discuss the practical barriers and future directions for the clinical translation of 4D flow MRI.
Main Methods:
- Four-dimensional flow MRI (4D flow MRI) is a time-resolved 3D phase-contrast MRI technique.
- It utilizes three-directional velocity encoding (VENC) to capture volumetric flow and multidirectional velocity data.
- Advanced analysis allows for measurement of flow volume, velocity, retrograde fraction, and pressure gradients.
Main Results:
- 4D flow MRI provides accurate volumetric flow and detailed hemodynamic metrics, including peak/mean velocity and shear-related parameters.
- It enables flexible retrospective analysis and network-level assessment of hepatic vasculature.
- Pressure-gradient estimation is feasible when combined with physics-based modeling.
Conclusions:
- 4D flow MRI represents a significant advancement for assessing hepatic vascular disorders, offering superior hemodynamic insights.
- Despite challenges like VENC tradeoffs and motion artifacts, automated analysis can mitigate workflow limitations.
- Standardized protocols and further validation are essential for widespread clinical adoption.
Abstract:
Hepatic vascular disorders include portal hypertension in cirrhosis, Budd-Chiari syndrome (BCS), hepatic vascular malformations, and vascular complications after liver transplantation. These diseases depend on blood-flow direction, flow redistribution, and pressure transmission, and not only on gross vessel shape. Doppler ultrasound, computed tomography angiography (CTA), and digital subtraction angiography (DSA) are widely used in current clinical practice, but each has distinct limits for full hemodynamic assessment, and repeated follow-up can be difficult to implement effectively in daily clinical work. Four-dimensional flow magnetic resonance imaging (4D flow MRI) is a time-resolved three-dimensional (3D) phase-contrast MRI method with three-directional velocity encoding (VENC). It provides volumetric flow and multidirectional velocity data across the cardiac cycle, and it allows flexible retrospective plane placement and comprehensive network-level analysis. It can accurately measure flow volume, peak and mean velocity, retrograde fraction, fractional flow change, and shear-related metrics. It also supports pressure-gradient estimation when combined with physics-based modeling in selected clinical settings. Hepatic imaging still faces multiple major constraints, including VENC tradeoffs, respiratory motion, limited small-vessel resolution, and the need for unified standardized acquisition and analysis. Workflow limits from segmentation and plane placement can be greatly reduced by modern automated analysis. This review systematically summarizes technical foundations, processing steps, disease-focused applications, and practical barriers for clinical translation.
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