Journal
ACTA RADIOLOGICA
Volume 48, Issue 7, Pages 788-797Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1080/02841850701408236
Keywords
arteries; CNS; computer applications; hemodynamics/ flow dynamics; MR angiography; vascular
Ask authors/readers for more resources
Background: A longstanding hypothesis that correlates fluid dynamic forces and atherosclerotic disease has led to numerous analytical, numerical, and experimental studies over the years because it is very difficult to measure the hemodynamic variables of blood in vivo. Purpose: To investigate the technique of visualization and quantitation of hemodynamic variables at carotid artery bifurcation in vivo by combining computational fluid dynamics ( CFD) and vascular imaging. Material and Methods: Twenty- six healthy volunteers underwent magnetic resonance ( MR) angiography of the bilateral carotid artery by a 3.0T whole- body scanner. Hemodynamic variables at these carotid bifurcations were calculated and visualized by combining vascular imaging post- processing and CFD. Results: The average velocity of the carotid bifurcation in the systolic phase and the diastolic phase was 0.46 +/- 0.24 m/ s and 0.23 +/- 0.05 m/ s, respectively. Eddy current and back flows were observed at bifurcation and the lateral part of the proximal internal carotid arteries ( ICA) and external carotid arteries ( ECA), and the shapes of them changed with phases of the cardiac cycle, which were significant at the middle of the systolic phase and faded out quickly downstream of the ICA and ECA. The average range of wall shear stress ( WSS) at the bifurcation was 4.36 +/- 1.32 Pa, and the maximum WSS was 18.02 +/- 4.11 Pa. The WSS map revealed a large region of low WSS at the carotid bulb and extended to the outer wall in the proximal end of the ICA ( the lowest value was below 0.5 Pa), and there was also a small region of low WSS at the outer wall in the proximal end of the ECA. Conclusion: CFD combined with vascular imaging can calculate and visualize hemodynamic variables at carotid bifurcation in vivo individually.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available