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Pulse flow of liquid in flexible tube
Komoráš, Miroslav ; Šedivý, Dominik (referee) ; Klas, Roman (advisor)
This master’s thesis is dealing with analysis of fluid flow pulse in a flexible tube representing e.g. an artery in a human body. In ANSYS program, 3D simulations were performed, and these are so-called interrelated FSI analysis. In Maple software, 1D simulations of fluid flow in the tube were performed for various thin-walled and thick-walled variants. The aim is using these programs to determine the flow rates and pressures in the tube, its wall deformation and stress. Therefore, the theoretical part deals mainly with basic equations of flow dynamics, linear and nonlinear models and rotationally symmetric vessels. In the computational part are described individual procedures in the mentioned programs.
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Stress-strain analysis of a sclerotic artery during angioplasty
Trtík, Adam ; Fuis, Vladimír (referee) ; Burša, Jiří (advisor)
This bachelor thesis focuses on an analytical calculation of maximum stress and deformation in arterial wall suffering from atherosclerosis during angioplasty and compares this value to the stress in wall of both healthy and sclerotic artery loaded by normal systolic pressure. Finally, the results are compared with corresponding model using the finite element method. In the theoretical part, the histology of arteries, their biomechanical properties and pathogenesis of atherosclerosis itself are briefly described.
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Stress-strain analysis of artery with atheroma
Maša, Marek ; Návrat, Tomáš (referee) ; Burša, Jiří (advisor)
The main goal of this diploma thesis was the stress-strain analysis of iliac artery with atheroma.This problem was solved using finite element method (FEM).For the calculation purposes three two-dimensional models were created. The geometry was gained from transversal sections through the iliac artery with ateroma. This geometry is educed from used literature review. The main calculation process was run by ANSYS 11.0 program system.
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The Segmentation of Ultrasound Images for Artery Wall Detection and Intima-Media Thickness Measurement
Beneš, Radek ; Chromý,, Erik (referee) ; Dostál, Otto (referee) ; Říha, Kamil (advisor)
The thesis focuses on the measurement of intima media thickness, which seems to be a significant marker of the risk of cardiovascular events. Intima media thickness is measured in ultrasound image displaying the common carotid artery in its longitudinal section. In the longitudinal section the intima and media layers are visible. Thesis is discussing both technical and medical background and summarizes state of the art in this field. The main part of the thesis describes the novel automatic system for measurement of intima media thickness. Proposed system includes also robust method for artery localization and therefore is able to process raw B-mode data from ultrasound station without any initialization or manual preprocessing.
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Influence of mechanical properties of vascular grafts on their clinical applications
Chomič, Dimitrij ; Polzer, Stanislav (referee) ; Burša, Jiří (advisor)
The theme of my bachelor’s thesis is the vascular replacement. I write about the types of blood vessels, their anatomy, physiology, pathology and mechanical characteristics. My thesis contains a part about the types of vascular replacements, I define their mechanical characteristics and I describe how the vascular replacement used in medicine. I study the artificial vascular replacement preferentially. To illustrate the application of the moment theory of cylindrical shells (Course in PP II), I solve the extreme stresses in the connection of a replacement with a vessel having mutually different geometrical and material parameters. The artery and the replacement were under pressure of 16 kPa corresponding to the systolic blood pressure.
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Stress-strain analysis of artificial vascular grafts
Chomič, Dimitrij ; Návrat, Tomáš (referee) ; Burša, Jiří (advisor)
This thesis deals with the computational solution of stress-strain states in the vicinity of the connection (anastomosis) between artery and vascular replacement. An „end to end“ anastomosis loaded by inner light increased constant systolic blood pressure is modeled in the thesis. The connection is modeled by different variants of the bonded contact and attachment of a surgical stitch. To solve the stress-strain state constitutive models were used in the finite element software package ANSYS 13.0. Material properties of arteries and vascular grafts were taken from measurements made at the Institute of solid mechanics, mechatronics and biomechanics.
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Pulse flow of liquid in flexible tube
Komoráš, Miroslav ; Šedivý, Dominik (referee) ; Klas, Roman (advisor)
This master’s thesis is dealing with analysis of fluid flow pulse in a flexible tube representing e.g. an artery in a human body. In ANSYS program, 3D simulations were performed, and these are so-called interrelated FSI analysis. In Maple software, 1D simulations of fluid flow in the tube were performed for various thin-walled and thick-walled variants. The aim is using these programs to determine the flow rates and pressures in the tube, its wall deformation and stress. Therefore, the theoretical part deals mainly with basic equations of flow dynamics, linear and nonlinear models and rotationally symmetric vessels. In the computational part are described individual procedures in the mentioned programs.
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Stress-strain analysis of a sclerotic artery during angioplasty
Trtík, Adam ; Fuis, Vladimír (referee) ; Burša, Jiří (advisor)
This bachelor thesis focuses on an analytical calculation of maximum stress and deformation in arterial wall suffering from atherosclerosis during angioplasty and compares this value to the stress in wall of both healthy and sclerotic artery loaded by normal systolic pressure. Finally, the results are compared with corresponding model using the finite element method. In the theoretical part, the histology of arteries, their biomechanical properties and pathogenesis of atherosclerosis itself are briefly described.
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