NDLI: Preliminary study of hemodynamic distribution in patient-specific stenotic carotid bifurcation by image-based computational fluid dynamics.

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Preliminary study of hemodynamic distribution in patient-specific stenotic carotid bifurcation by image-based computational fluid dynamics.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Xue, Y-J Gao, P-Y Duan, Q. Lin, Y. Dai, C-B
Description	Country affiliation: China Author Affiliation: Xue YJ ( Department of Radiology, Affiliated Union Hospital of Fujian Medical University, Fuzhou, Fujian, China. xueyunjing@126.com)
Abstract	BACKGROUND: Regions prone to atherosclerosis, such as bends and bifurcations, tend to exhibit a certain degree of non-planarity or curvature, and these geometric features are known to strongly influence local flow patterns. Recently, computational fluid dynamics (CFD) has been used as a means of enhancing understanding of the mechanisms involved in atherosclerotic plaque formation and development. PURPOSE: To analyze flow patterns and hemodynamic distribution in stenotic carotid bifurcation in vivo by combining CFD with magnetic resonance angiography (MRA). MATERIAL AND METHODS: Twenty-one patients with carotid atherosclerosis proved by digital subtraction angiography (DSA) and/or Doppler ultrasound underwent contrast-enhanced MR angiography of the carotid bifurcation by a 3.0T MR scanner. Hemodynamic variables and flow patterns of the carotid bifurcation were calculated and visualized by combining vascular imaging postprocessing with CFD. RESULTS: In mild stenotic cases, there was much more streamlined flow in the bulbs, with reduced or disappeared areas of weakly turbulent flow. Also, the corresponding areas of low wall shear stress (WSS) were reduced or even disappeared. As the extent of stenosis increased, stronger blood jets formed at the portion of narrowing, and more prominent eddy flows and slow back flows were noted in the lee of the stenosis. Regions of elevated WSS were predicted at the portion of stenosis and in the path of the downstream jet. Areas of low WSS were predicted on the leeward side of the stenosis, corresponding with the location of slowly turbulent flows. CONCLUSION: CFD combined with MRA can simulate flow patterns and calculate hemodynamic variables in stenotic carotid bifurcations as well as normal ones. It provides a new method to investigate the relationship of vascular geometry and flow condition with atherosclerotic pathological changes.
File Format	HTM / HTML
ISSN	02841851
Issue Number	5
Volume Number	49
e-ISSN	16000455
Journal	Acta Radiologica
Language	English
Publisher	Sage Publications
Publisher Date	2008-06-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Radiology Carotid Stenosis Diagnosis Hemodynamics Aged Blood Flow Velocity Carotid Arteries Pathology Contrast Media Administration & Dosage Female Gadolinium Dtpa Hemorheology Methods Humans Image Enhancement Image Processing, Computer-assisted Imaging, Three-dimensional Magnetic Resonance Angiography Instrumentation Male Middle Aged Regional Blood Flow Vascular Resistance Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Radiology, Nuclear Medicine and Imaging Radiological and Ultrasound Technology

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Preliminary study of hemodynamic distribution in patient-specific stenotic carotid bifurcation by image-based computational fluid dynamics.