Related Experiment Videos
Contrast settling in cerebral aneurysm angiography
Zhi-Jie Wang1, Kenneth R Hoffmann, Zhou Wang
1Toshiba Stroke Research Center, University at Buffalo, State University of New York, 3435 Main Street, 445 BRB, Buffalo, NY 14214, USA.
Physics in Medicine and Biology
|June 24, 2005
Summary
Contrast settling in cerebral aneurysms is influenced by blood flow dynamics and vessel curvature. Angiography with lateral views is crucial for accurate analysis, especially when using stents.
Area of Science:
- Fluid mechanics
- Biomedical engineering
- Medical imaging
Background:
- Angiography visualizes blood flow using contrast agents denser than blood.
- Contrast settling, where agents separate due to gravity, occurs in complex vasculature like cerebral aneurysms.
- Understanding the fluid mechanics of contrast settling is vital for accurate clinical angiography.
Observation:
- Flow in sidewall aneurysm models with varying parent-vessel curvature was studied using angiography.
- Intravascular stents were deployed in one group of models.
- Lateral view angiography was used to detect contrast settling, complemented by time-intensity curve analysis and computational fluid dynamics.
Findings:
- Contrast settling strongly correlates with local flow dynamics, characterized by the Froude number.
- Higher vessel curvature leads to increased flow, a larger Froude number, and reduced gravitational settling.
- Stent deployment decreases aneurysmal flow, intensifying contrast settling and altering time-intensity curves.
Implications:
- Contrast settling can mimic other flow patterns, necessitating lateral views in addition to standard anteroposterior (AP) views.
- Accurate assessment of blood flow in aneurysms requires ruling out contrast settling.
- This research provides physical principles to evaluate contrast settling in clinical settings.