Temat: circle of Willis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Ocena morfometryczna podziału środkowych tętnic mózgowych prawidłowych i z tętniakiem
Morphometry of bifurcation of middle cerebral arteries in patient with and without aneurysm
Autorzy:: Kawlewska, E.
Hehnel, N.
Wolański, W.
Ćmiel-Smorzyk, K.
Kaspera, W.
Powiązania:: https://bibliotekanauki.pl/articles/98830.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Śląska. Katedra Biomechatroniki
Tematy:: koło Willisa
tętniak
pomiar morfologiczny
indeksy
circle of Willis
aneurysm
morphological measurement
indices
Opis:: W artykule przeprowadzono analizę morfologiczną tętnic środkowych mózgu w miejscu podziału na tętnicę skroniową i czołową. Trójwymiarowe modele tętnic pacjentów zostały wygenerowane w środowisku Mimics na podstawie zdjęć angioTK. Analizowano tętnice 24 pacjentów z tętniakiem oraz 24 pacjentów zdrowych, u których badanie angioTK wykonano w ramach rutynowej diagnozy innych schorzeń. Uzyskaną bazę danych podsumowano metodami statystki opisowej, porównywano m.in. średnie wartości pól przekrojów, obwodów i średnic poszczególnych naczyń, a także kąty pomiędzy tętnicami. Praca stanowi podstawę do dalszej wielowymiarowej analizy statystycznej.
In this paper it was performed the morphological analysis of bifurcation geometry in middle cerebral arteries. The three-dimensional models of arteries were obtained from angiography images from 24 healthy people and 24 patients with aneurysm. There were analyzed the mean values and quartiles of diameters, areas, circumferences and angles. It was also calculated kurtosis, to check whether the distribution is normal. The studies are the basis for further, multivariate statistical analysis.
Źródło:: Aktualne Problemy Biomechaniki; 2016, 11; 53-58
1898-763X
Pojawia się w:: Aktualne Problemy Biomechaniki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental and numerical modelling of flow in the human cerebral arteries
Autorzy:: Cieślicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/333722.pdf
Data publikacji:: 2004
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: koło tętnicze Willisa
tętnice mózgowe
model fizyczny
circle of Willis
cerebral arteries
physical model
nonlinearity of flow
Opis:: The paper presents the results of experiments concerning flow in the model of cerebral supplying arteries and the Circle of Willis (CW). Vascular phantom was prepared on the basis of anatomical specimens. The most typical artery shapes and dimensions were considered. Pressure distribution in 6 characteristic points is provided, and so are the average flow rates in the anterior, middle and posterior section of the brain. Tests were run in the conditions replicating the physiological state (i.e. when the supplying arteries were fully patent) and in pathological conditions, in which the internal carotid and vertebral arteries were occluded on one or both sides. Thus obtained results were compared with the results of computer simulations based on linear and non-linear flow models. To estimate the non-linear resistance of vascular segment two phenomenological formulae were proposed. High degree of correlation between the values obtained from experiments and those registered in non-linear computer model proves usefulness of proposed formulae. It verifies the hypothesis that nonlinearity of flow characteristics of the vessel segments is to a great extent caused by their tortuous and small length in relation to diameter. Non-linear effects are particularly pronounced in conditions of pathological occlusion of supplying vessels.
Źródło:: Journal of Medical Informatics & Technologies; 2004, 7; IP17-26
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modeling of human circle of Willis with and without aneurisms
Autorzy:: Ivanov, D.
Dol, A.
Pavlova, O.
Aristambekova, A.
Powiązania:: https://bibliotekanauki.pl/articles/307003.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: 3D design
aneurysm
circle of Willis
hyperelastic material
mathematical modelling
mechanical tests
3D
model matematyczny
materiał hiperelastyczny
Opis:: Purpose: This paper includes results of the first stage of research aimed at the development of recommendations for physicians in order to help them to choose a particular type of cerebral arteries aneurysms treatment. Methods: Recent studies show that the majority of aneurysms develop as a result of hemodynamic and degenerative lesions of the vascular wall. Obviously, such wall damage can be studied using the methods of continuum mechanics and numerical simulations. Biomechanical modelling allows us to study hemodynamic parameters and stress-strain state of these arteries in health and disease, and to formulate practical recommendations for the necessity and reasonable selection of a particular type of cerebral arteries aneurysm treatment. Results: At this stage the realistic geometric models of arterial circle of Willis were built for its normal state and in the presence of aneurysms. The ultrasound analysis of circle of Willis was conducted in order to obtain blood flow parameters and the boundary conditions for carotid and vertebral arteries. Also, the mechanical properties of these arteries were investigated and constants of the Mooney–Rivlin strain energy function were obtained. Conclusions: Thus, the boundary problem describing the behaviour of human Willis circle arteries was stated. Further, this problem will be solved numerically using the finite element method. The numerical results will be analyzed from the point of view of the influence of the mechanical factors on the emergence, growth and rupture of circle of Willis aneurysms.
Źródło:: Acta of Bioengineering and Biomechanics; 2014, 16, 2; 121-129
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Reversed Robin Hood syndrome in the light of nonlinear model of cerebral circulation
Autorzy:: Piechna, A.
Cieslicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/264358.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: cerebral blood flow
autoregulation
steal syndrome
circle of Willis
Computational Fluid Dynamics (CFD)
autoregulacja
przepływ krwi w mózgu
tętnica
Opis:: The brain is supplied by the internal carotid and vertebro-basilar systems of vessels interconnected by arterial anastomoses and forming at the base of the brain a structure called the Circle of Willis (CoW). An active intrinsic ability of cerebral vascular bed maintains constant Cerebral Blood Flow (CBF) in a certain range of systemic pressure changes. This ability is called autoregulation and together with the redundant structure of the CoW guarantee maintaining CBF even in partial occlusion of supplying arteries. However, there are some situations when the combination of those two mechanisms causes an opposite effect called the Reversed Robin Hood Syndrome (RRHS). In this work we proposed a model of the CoW with autoregulation mechanism and investigated a RRHS which may occur in the case of Internal Carotid Artery (ICA) stenosis combined with hypercapnia. We showed and analyzed the mechanism of stealing the blood by the contralateral side of the brain. Our results were qualitatively compared with the clinical reports available in the literature.
Źródło:: International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 459-464
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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