Wall shear stress calculations based on 3D cine phase contrast MRI and computational fluid dynamics: a comparison study in healthy carotid arteries

2014 ◽  
Vol 27 (7) ◽  
pp. 826-834 ◽  
Author(s):  
Merih Cibis ◽  
Wouter V. Potters ◽  
Frank J. H. Gijsen ◽  
Henk Marquering ◽  
Ed vanBavel ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Phase Contrast ◽  
Carotid Arteries ◽  
Comparison Study ◽  
Phase Contrast Mri ◽  
Wall Shear ◽  
Cine Phase Contrast

Volumetric arterial wall shear stress calculation based on cine phase contrast MRI

2014 ◽  
Vol 41 (2) ◽  
pp. 505-516 ◽  
Author(s):  
Wouter V. Potters ◽  
Pim van Ooij ◽  
Henk Marquering ◽  
Ed vanBavel ◽  
Aart J. Nederveen
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Phase Contrast ◽  
Arterial Wall ◽  
Phase Contrast Mri ◽  
Stress Calculation ◽  
Wall Shear ◽  
Cine Phase Contrast

scholarly journals The Effect of Spatial and Temporal Resolution of Cine Phase Contrast MRI on Wall Shear Stress and Oscillatory Shear Index Assessment

PLoS ONE ◽  
2016 ◽  
Vol 11 (9) ◽  
pp. e0163316 ◽  
Author(s):  
Merih Cibis ◽  
Wouter V. Potters ◽  
Frank J. Gijsen ◽  
Henk Marquering ◽  
Pim van Ooij ◽  
...  
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Temporal Resolution ◽  
Phase Contrast ◽  
Oscillatory Shear ◽  
Oscillatory Shear Index ◽  
Phase Contrast Mri ◽  
Wall Shear ◽  
Cine Phase Contrast

Comparison of morphological and rheological conditions between conventional and eversion carotid endarterectomy using computational fluid dynamics – a pilot study

Vascular ◽  
2014 ◽  
Vol 23 (5) ◽  
pp. 474-482 ◽  
Author(s):  
S Demirel ◽  
D Chen ◽  
Y Mei ◽  
S Partovi ◽  
H von Tengg-Kobligk ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Carotid Endarterectomy ◽  
Patient Specific ◽  
Specific Data ◽  
Computational Fluid Dynamics Analysis ◽  
Carotid Bulb ◽  
Wall Shear

Purpose: To compare postoperative morphological and rheological conditions after eversion carotid endarterectomy versus conventional carotid endarterectomy using computational fluid dynamics. Basic methods: Hemodynamic metrics (velocity, wall shear stress, time-averaged wall shear stress and temporal gradient wall shear stress) in the carotid arteries were simulated in one patient after conventional carotid endarterectomy and one patient after eversion carotid endarterectomy by computational fluid dynamics analysis based on patient specific data. Principal findings: Systolic peak of the eversion carotid endarterectomy model showed a gradually decreased pressure along the stream path, the conventional carotid endarterectomy model revealed high pressure (about 180 Pa) at the carotid bulb. Regions of low wall shear stress in the conventional carotid endarterectomy model were much larger than that in the eversion carotid endarterectomy model and with lower time-averaged wall shear stress values (conventional carotid endarterectomy: 0.03–5.46 Pa vs. eversion carotid endarterectomy: 0.12–5.22 Pa). Conclusions: Computational fluid dynamics after conventional carotid endarterectomy and eversion carotid endarterectomy disclosed differences in hemodynamic patterns. Larger studies are necessary to assess whether these differences are consistent and might explain different rates of restenosis in both techniques.

NUMERICAL SIMULATION OF HEMODYNAMICS IN PORTAL VEIN WITH THROMBOSIS BY COMPUTATIONAL FLUID DYNAMICS

2014 ◽  
Vol 14 (06) ◽  
pp. 1440006 ◽  
Author(s):  
XINKAI WANG ◽  
GUOJIE LI ◽  
BIN CHEN ◽  
YANSONG PU ◽  
PENG NIE ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Portal Vein ◽  
Mechanical Damage ◽  
Maximum Velocity ◽  
Vein System ◽  
Vein Thrombosis ◽  
Wall Shear

Portal vein thrombosis (PVT) is an important complication that is associated with cirrhotic portal hypertension. The etiology is as yet unclear but could be closely related to the hemodynamics of the portal vein system. This paper investigated the hemodynamics in the portal vein model, both with and without thrombosis, as well as the effect of obstructions on the hemodynamics of the portal vein system using the computational fluid dynamics (CFD) method. PVT can probably develop in the inlets of the portal vein as well as the left/right branches of the portal vein because the distribution of wall shear stress satisfies the conditions for PVT formation based upon the simulation of the hemodynamics in the normal portal vein model. According to the above results, geometric models for a portal vein with a thrombus were constructed and the influence of different degrees (26%, 39%, 53% and 64%) of obstructions was studied. In the model with the maximum obstruction (64% blocked), the maximum velocity of portal vein (PV) increased up to twice than in the model without thrombosis, and the maximum wall shear stress of PV in the model with thrombosis (64% blocked) increased up to 9.4 Pa, whereas it was only 1.9 Pa in the model without thrombosis (nearly one fifth of the maximum wall shear stress). Excessive wall shear stress may cause mechanical damage to the blood vessels and induce physiological changes.

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