SENSITIVITY ANALYSIS OF COMPUTATIONAL STRUCTURAL DYNAMICS IN A CEREBRAL ANEURYSM MODEL TO WALL THICKNESS AND MODEL

2012 ◽  
Vol 12 (03) ◽  
pp. 1250054 ◽  
Author(s):  
ALVARO VALENCIA ◽  
MAXIMILIANO ROJO ◽  
RODRIGO RIVERA ◽  
EDUARDO BRAVO
Keyword(s):  
Cerebral Aneurysm ◽  
Structural Dynamics ◽  
Wall Thickness ◽  
Three Dimensional ◽  
Image Data ◽  
Realistic Model ◽  
Aneurysm Wall ◽  
Computational Structural Dynamics ◽  
Different Thickness ◽  
Aneurysm Model

Intracranial saccular aneurysms tend to be thin walled and stiffer compared with a normal artery. The current work describes computational structural dynamics (CSD) in an anatomically realistic model of a cerebral aneurysm located in the ophthalmic region, using different wall thickness, model data for the artery and aneurysm, and geometry size. The model was obtained from three-dimensional rotational angiography image data. The wall was assumed three-dimensional hyperelastic solid with different thickness in the artery and in the aneurysm regions. The effects of carotid siphon length are reported. The CSD was solved with the finite elements package ADINA. The predictions of stress and strain on the aneurysm wall were compared.

Evaluation of cerebral aneurysm wall thickness in experimental aneurysms: Comparison of 3T-MR imaging with direct microscopic measurements

2013 ◽  
Vol 156 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Camillo Sherif ◽  
Günther Kleinpeter ◽  
Georg Mach ◽  
Michel Loyoddin ◽  
Thomas Haider ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Cerebral Aneurysm ◽  
Wall Thickness ◽  
Aneurysm Wall ◽  
3T Mr

scholarly journals Overestimation of cerebral aneurysm wall thickness by black blood MRI?

2010 ◽  
Vol 31 (3) ◽  
pp. 766-766 ◽  
Author(s):  
David A. Steinman ◽  
Luca Antiga ◽  
Bruce A. Wasserman
Keyword(s):  
Cerebral Aneurysm ◽  
Wall Thickness ◽  
Black Blood ◽  
Aneurysm Wall ◽  
Black Blood Mri

scholarly journals Study of Extracted Geometry Effect on Patient-Specific Cerebral Aneurysm Model with Different Threshold Coefficient (Cthres)

CFD letters ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 1-14
Author(s):  
Lim Sheh Hong ◽  
Mohd Azrul Hisham Mohd Adib ◽  
Mohd Shafie Abdullah ◽  
Nur Hartini Mohd Taib ◽  
Radhiana Hassan ◽  
...  
Keyword(s):  
Cerebral Aneurysm ◽  
Cfd Simulation ◽  
Medical Images ◽  
Three Dimensional ◽  
Threshold Value ◽  
Physiological Effect ◽  
Patient Specific ◽  
High Threshold ◽  
Real Patient ◽  
Aneurysm Model

The recent diagnostic assessment of cerebrovascular disease makes use of computational fluid dynamics (CFD) to quantify blood flow and determine the hemodynamics factors contributing to the disease from patient-specific models. However, compliant and anatomical patient-specific geometries are generally reconstructed from the medical images with different threshold values subjectively. Therefore, this paper tends to present the effect of extracted geometry with different threshold coefficient, Cthres by using a patient-specific cerebral aneurysm model. A set of medical images, digital subtraction angiography (DSA) images from the real patient diagnosed with internal carotid artery (ICA) aneurysm was obtained. The threshold value used to extract the patient-specific cerebral aneurysm geometry was calculated by using a simple threshold determination method. Several threshold coefficients, Cthres such as 0.2, 0.3, 0.4, 0.5 and 0.6 were employed in the image segmentation creating three-dimensional (3D) realistic arterial geometries that were then used for CFD simulation. As a result, we obtained that the volume of patient-specific cerebral aneurysm geometry decreases as the threshold coefficient, Cthres increases. There is dislocation of artery attached to the ICA aneurysm geometry occurred at a high threshold coefficient, Cthres. Besides, the physical changes also bring remarkable physiological effect on the wall shear stress (WSS) distribution and velocity flow field at patient-specific cerebral aneurysm geometry reconstructed with different threshold coefficient, Cthres.

MODELING OF ABDOMINAL AORTA ANEURYSM AND STUDY OF THE PATHOLOGY USING COMPUTATIONAL FLUID DYNAMICS METHOD

2011 ◽  
Vol 23 (04) ◽  
pp. 295-305 ◽  
Author(s):  
Raya Majdani Shabestari ◽  
Kamran Hassani ◽  
Farhad Izadi
Keyword(s):  
Abdominal Aorta ◽  
Three Dimensional ◽  
Aortic Aneurysms ◽  
Rupture Risk ◽  
Abdominal Aorta Aneurysm ◽  
Aorta Aneurysm ◽  
Aneurysm Wall ◽  
Aneurysm Diameter ◽  
Aneurysm Model ◽  
Dynamics Method

In this paper, we have constructed a three-dimensional abdominal aorta aneurysm model based on the CT-scan/angiography images. The inlet velocity is pulsatile and the simulation was done by means of finite volume analysis. The velocity and pressure contours were obtained for four different aneurysm sizes in three sections. The results indicate that the velocity decreases in aneurysm wall but pressure increases in that area. Furthermore, the increase of the aneurysm diameter increases the rupture risk due to high pressure in the wall. The shear stress is high in the start point and end of the aneurysm's curvature. Our study indicates that the aneurysm diameter is directly related to the pressure. High blood pressure could be a risk factor in artery rapture. Our model can serve as a useful tool for the study of the aortic aneurysms.

scholarly journals Improvement in the Fabrication of a Three-dimensional Cerebral Aneurysm Model for Surgical Simulation

2020 ◽  
Vol 48 (5) ◽  
pp. 346-352
Author(s):  
Toshihiro MASHIKO ◽  
Takashi KOBARI ◽  
Hirofumi OGUMA ◽  
Takehiko KONNO ◽  
Naoki KANEKO ◽  
...  
Keyword(s):  
Cerebral Aneurysm ◽  
Surgical Simulation ◽  
Three Dimensional ◽  
Aneurysm Model

scholarly journals Fluid Structural Analysis of Human Cerebral Aneurysm Using Their Own Wall Mechanical Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-18 ◽  
Author(s):  
Alvaro Valencia ◽  
Patricio Burdiles ◽  
Miguel Ignat ◽  
Jorge Mura ◽  
Eduardo Bravo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Internal Pressure ◽  
Cerebral Aneurysm ◽  
Variable Thickness ◽  
Solid Mechanics ◽  
Cfd Simulation ◽  
Realistic Model ◽  
Normal Variable ◽  
Computational Structural Dynamics ◽  
The One

Computational Structural Dynamics (CSD) simulations, Computational Fluid Dynamics (CFD) simulation, and Fluid Structure Interaction (FSI) simulations were carried out in an anatomically realistic model of a saccular cerebral aneurysm with the objective of quantifying the effects of type of simulation on principal fluid and solid mechanics results. Eight CSD simulations, one CFD simulation, and four FSI simulations were made. The results allowed the study of the influence of the type of material elements in the solid, the aneurism’s wall thickness, and the type of simulation on the modeling of a human cerebral aneurysm. The simulations use their own wall mechanical properties of the aneurysm. The more complex simulation was the FSI simulation completely coupled with hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness. The FSI simulation coupled in one direction using hyperelastic Mooney-Rivlin material, normal internal pressure, and normal variable thickness is the one that presents the most similar results with respect to the more complex FSI simulation, requiring one-fourth of the calculation time.

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