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Дисертації з теми "Blood Flow Analysis"

Автор: Grafiati

Опубліковано: 21 грудня 2024

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1

Nasimi, Seerous Ghulam Abbas Ali. "Analysis of skin blood flow signals." Thesis, University of Bradford, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305700.

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2

Park, Chang Sub. "Mathematical techniques for the analysis of unsteady blood flow." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.532000.

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3

Wicks, David Andrew Greenwood. "Intravascular blood flow measurement by quantitative cineangiographic image analysis." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277411.

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4

Andrew, Margaret L. "Automatic analysis of gated blood pool studies." Thesis, University of Brighton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334330.

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5

Nitzpon, Hans-Jürgen. "Doppler ultrasound analysis of high velocity and turbulent blood flow /." [S.l.] : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1274.

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6

Davis, Paul H. "Analysis of non-Newtonian effects in separated blood flow regions." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17912.

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7

Javan, Roshtkhari Soroor. "Analysis of blood flow during vascular development in chick embryos." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104810.

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Анотація:

The cardiovascular system is the first fully functional organ system in the vertebrate embryo. Proper formation of the vasculature is essential for proper embryonic development. Blood flow plays a significant role in the adaptable characteristics of the vessels, as well as innetwork remodelling. As soon as blood flow begins, vessels respond to external stimuli such asshear stress, the tangential force created by the blood flow, which affect the surrounding tissue. Shear stress is the product of both the velocity profile in the vessel and the viscosity of the flowing fluid, and these parameters

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8

James, Peter Welbury. "Design and analysis of studies to estimate cerebral blood flow." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251020.

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9

Xu, Xiong. "Numerical analysis of blood flow in 3-D arterial bifurcations." Thesis, City University London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316023.

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10

Hinsdale, Taylor A. "Laser Speckle Imaging: A Quantitative Tool for Flow Analysis." DigitalCommons@CalPoly, 2014. https://digitalcommons.calpoly.edu/theses/1251.

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Анотація:

Laser speckle imaging, often referred to as laser speckle contrast analysis (LASCA), has been sought after as a quasi-real-time, full-field, flow visualization method. It has been proven to be a valid and reliable qualitative method, but there has yet to be any definitive consensus on its ability to be used as a quantitative tool. The biggest impediment to the process of quantifying speckle measurements is the introduction of additional non dynamic speckle patterns from the surroundings. The dynamic speckle pattern under investigation is often obscured by noise caused by background static spec

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11

Logan, J. F. J. "Vascular mechanisms in glaucoma - a phenotype and genotypic analysis." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246424.

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12

Hollander, Ellen Herdis. "Wave-intensity analysis of pulmonary arterial blood flow in anesthetized dogs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ31035.pdf.

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13

Lee, Ka Wai. "Numerical analysis of blood flow and wall mechanics in stenosed arteries." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398341.

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14

Smith, Leonard. "A system for the acquisition and digital analysis of lower limb flow waveforms." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/27049.

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Анотація:

A PC based waveform acquisition and analysis system has been developed for use in aorta-iliac arterial assessment. A Motorola DSP56001 based system containing dual Analog to Digital converters is used to sample phase quadrature demodulated signals from a commercially available continuous wave Doppler unit. The Power Spectral Density is calculated using an autoregressive model from which the mean velocity waveform is calculated. This waveform is used to calculate the damping factor, vessel compliance and runoff resistance of a simple electrical model of the lower limb arterial circulation using

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15

Fisico, Alfredo Odon Rodriguez Ingeniero. "Determination of flow with echo-planar imaging." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363605.

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16

Nik, Mohamed Nik Elena. "Investigation of blood dynamics : surface flow and droplet stain morphology on fabrics." University of Western Australia. Centre for Forensic Science, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0112.

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Анотація:

This thesis is divided into two parts, each of which examines aspects of bloodstain analysis where gravity is the main force applied to blood. Part I is a preliminary study on the dynamics of blood flow on various inclined surfaces and examines the use of blood analogs for easy test replication. The flow of uncoagulated human blood at different volumes and temperatures was examined on wood at a set angle of 1.5°, and on glass at varying incline angles. Glycerol solutions of 59% and 42% were used to represent blood at 23°C and 37°C respectively. Glycerol flow trials of similar volumes were cond

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17

Deparis, Simone. "Numerical analysis of axisymmetric flows and methods for fluid-structure interaction arising in blood flow simulation /." [S.l.] : [s.n.], 2004. http://library.epfl.ch/theses/?display=detail&nr=2965.

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18

Tingying, Peng. "Signal processing methods for the analysis of cerebral blood flow and metabolism." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:ca84ac5b-7df0-488d-b390-d6f4f6e3ee52.

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Анотація:

An important protective feature of the cerebral circulation is its ability to maintain sufficient cerebral blood flow and oxygen supply in accordance with the energy demands of the brain despite variations in a number of external factors such as arterial blood pressure, heart rate and respiration rate. If cerebral autoregulation is impaired, abnormally low or high CBF can lead to cerebral ischemia, intracranial hypertension or even capillary damage, thus contributing to the onset of cerebrovascular events. The control and regulation of cerebral blood flow is a dynamic, multivariate phenomenon.

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19

Fatona, Oluwatoyin Fadeke. "Analysis of morphological and blood flow characteristics of the human thoracic aorta." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/58352.

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Анотація:

The human aorta is often affected by many cardiovascular diseases, including atherosclerosis, aneurysm and dissection. There is considerable evidence suggesting that these diseases are associated with the morphology and haemodynamic functions of the aorta, but not all these parameters can be measured directly in vivo. In particular, the helical flow characteristics and haemodynamic wall parameters can only be evaluated from quantitative information on a flow field resolved both in space and time. This study provides a comprehensive analysis of geometric and haemodynamic characteristics of the

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20

Cape, Edward Gene. "Theoretical and experimental analysis of intracardiac jets : new techniques for noninvasive quantification of valvular insufficiency." Diss., Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/11310.

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21

Chetlur, Adithya Prashanth. "A Novel Framework to Determine Physiological Signals From Blood Flow Dynamics." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7610.

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Анотація:

Centers for Disease Control and Prevention (CDC) estimate that more than 11.2 million people require critical and emergency care in the United States per year. Optimizing and improving patient morbidity and mortality outcomes are the primary objectives of monitoring in critical and emergency care. Patients in need of critical or emergency care in general are at a risk of single or multiple organ failures occurring due to a traumatic injury, a surgical event, or an underlying pathology that results in severe patient hemodynamic instability. Hence, continuous monitoring of fundamental cardiovas

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22

Jun, Yang. "Analysis and Visualization of the Two-Dimensional Blood Flow Velocity Field from Videos." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32539.

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We estimate the velocity field of the blood flow in a human face from videos. Our approach first performs spatial preprocessing to improve the signal-to-noise ratio (SNR) and the computational efficiency. The discrete Fourier transform (DFT) and a temporal band-pass filter are then applied to extract the frequency corresponding to the subjects heart rate. We propose multiple kernel based k-NN classification for removing the noise positions from the resulting phase and amplitude maps. The 2D blood flow field is then estimated from the relative phase shift between the pixels. We evaluate our ap

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23

Abatay, Hasan. "Analysis of the role of nitric oxide in the control of blood flow." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540086.

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24

Wang, Ying. "Analysis of venous blood flow and deformation in the calf under external compression." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/7080.

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Анотація:

Deep vein thrombosis (DVT) is a common post-operative complication, and a serious threat to the patient’s general recovery. In recent years, there has been increasing awareness of the risk of DVT in healthy individuals after prolonged immobility, such as people taking long-period flights or sitting at a computer. Mechanical methods of DVT prophylaxis, such as compression stockings, have gained widespread acceptance, but the haemodynamic mechanism of their action is still not well understood. In this study, computational modelling approaches based on magnetic resonance (MR) images are used to (

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25

Liu, Dan. "Computational analysis of blood flow and oxygen transport in the retinal arterial network." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6033.

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Анотація:

Pathological changes in retinal microvasculature are known to be associated with systemic diseases such as hypertension and diabetes, and may result in potentially disadvantageous blood flow and impair oxygen distribution. Therefore, in order to improve our understanding of the link between systemic diseases and the retinal circulation, it is necessary to develop an approach to quantitatively determine the hemodynamic and oxygen transport parameters in the retinal vascular circulation. This thesis aims to provide more insights into the detailed hemodynamic features of the retinal arterial tree

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26

Cheng, Zhuo. "Analysis of blood flow in patient-specific models of type B aortic dissection." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9178.

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Анотація:

Aortic dissection is the most common acute catastrophic event affecting the aorta. The majority of patients presenting with an uncomplicated type B dissection are treated medically, but 25% of these patients develop subsequent dilatation and aortic aneurysm formation. The reasons behind the long‐term outcomes of type B aortic dissection are poorly understood. As haemodynamic factors have been involved in the development and progression of a variety of cardiovascular diseases, the flow phenomena and environment in patient‐specific models of type B aortic dissection have been studied in this the

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27

Routh, H. F. "Scattering of ultrasound by blood with reference to the analysis of doppler signals." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380271.

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28

Faddoul, R. Y. "A high frequency ultrasound pulsed doppler system for the measurement of skin blood flow." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355397.

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29

Schlindwein, Fernando Soares. "Real-time digital processing of Doppler ultrasound signals and its application to blood flow measurement." Thesis, University of Leicester, 1990. http://hdl.handle.net/2381/34225.

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A system comprising of a personal microcomputer and a Digital Signal Processor board has been assembled and programmed for real-time spectral analysis of Doppler ultrasound signals. Three spectrum analysis techniques were implemented to run in real-time on the system: The fast Fourier transform (FFT), the autoregressive (AR) model, and the moving average (MA) model. The FFT and the AR techniques were investigated in some depth. The advantages of using such a system are that it is entirely programmable, cheap, reliable, and that the processed information can be stored on diskettes. The inputs t

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30

Elwell, Clare Elizabeth. "Measurement and data analysis techniques for the investigation of adult cerebral haemodynamics using near infrared spectroscopy." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244793.

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31

Lima, R. "Analysis of the blood flow behavior through microchannels by a confocal micro-PIV/PTV system." Doctoral thesis, Tohoku University, 2007. http://hdl.handle.net/10198/1263.

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Анотація:

Over the years, various experimental methods have been applied in an effort to understand the blood flow behavior in microcirculation. Most of our current knowledge in microcirculation is based on macroscopic flow phenomena such as Fahraeus effect and Fahraeus-Linqvist effect. The development of optical experimental techniques has contributed to obtain explanations on the way the blood flows through microvessels. Although the past results have been encouraging, detailed studies on the flow properties of blood in the microcirculation has been limited by several technical factors such as poor sp

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32

Folarin, Amos Akinola. "Analysis of tumour angio-architecture and blood flow using microcomputed tomography and lattice Boltzmann simulations." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1444208/.

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The precise architecture of the vascular system is critical to its many specialised functions. In sharp contrast tumour vascular architecture is highly disorganised and dysfunctional. The reason for this is the grossly abnormal angiogenic signalling prevalent in the tumour microenvironment. Aberrant tumour vasculature is a key determinant of spatial and temporal heterogeneities of blood flows. Additionally, irregularities in the tumour vascular wall, a lack of functional lymphatics and a severely retarded trans-mural hydrostatic pressure gradient also diminish convective transport out of the v

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33

Wang, Jiaqiu. "Image-based patient-specific computational biomechanical analysis of the interaction between blood flow and atherosclerosis." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/202017/1/Jiaqiu_Wang_Thesis.pdf.

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This research focuses on the development of a biomechanical strategy for risk assessment of atherosclerotic plaque rupture, which is a leading cause of acute cardiovascular events, such as heart attack and stroke. Image-based three-dimensional coronary and carotid arterial models were developed, and computational biomechanical analysis was performed to evaluate the mechanical interaction between blood flow and atherosclerosis. This study uncovered the biomechanical risk factors that are associated with high-risk atherosclerosis and provided a biomechanical tool for detecting high-risk plaques.

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34

Christophe, Jean-Joseph. "Patient-specific morphological and blood flow analysis of pulmonary artery in the case of pneumothorax." Paris 6, 2011. http://www.theses.fr/2011PA066255.

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Анотація:

Le pneumothorax se caractérise par l’affaissement d’un poumon. A ce jour, l’effet morphologique et hémodynamique du pneumothorax sur les artères pulmonaires reste peu compris. La géométrie des artères a été extraite et reconstruite à partir d’images tomographiques de trois patients. Différents paramètres géométriques ont été calculés. La forme du tronc et des branches de l’artère pulmonaire a été fortement affectée. Pour clarifier l’effet des perturbations géométriques sur le flux sanguin, les équations de Navier Stokes pour un flux stable laminaire ont été résolues en introduisant une résista

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35

Carrig, Pauline Elize. "The effect of blood chemistry on the rheological properties of the fluid." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/94451.

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A four variable constitutive equation was developed utilizing the method first presented by Schneck and Walburn. Spearman rank correlation coefficients were calculated on whole blood samples within a narrow range of hematocrit to investigate further the effect of the various plasma constituents on whole blood viscosity. Viscosity measurements were made on one hundred anticoagulated blood samples of known hematocrit and chemical composition. The constitutive equation was developed using a power law functional form similar to that employed by Schneck and Walburn. This equation contains two para

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36

Graça, Cristo dos Santos Lopes Ruano Maria da. "Investigation of real-time spectral analysis techniques for use with pulsed ultrasonic Doppler blood flow detectors." Thesis, Bangor University, 1992. https://research.bangor.ac.uk/portal/en/theses/investigation-of-realtime-spectral-analysis-techniques-for-use-with-pulsed-ultrasonic-doppler-blood-flow-detectors(f184d2a8-bde7-492a-b487-438704d3ea04).html.

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Анотація:

The goals of the work described here were the development of a method of selection of spectral estimation for use with pulsed Doppler ultrasonic blood flow instruments, and the use of this method to select an estimator and its implementation in a form suitable for real-time applications. A study of estimation accuracy of the mean frequency and bandwidth using a number of spectral estimators was carried out. Fourier based, parametric, and, minimum variance estimators were considered. A Doppler signal simulator was developed to allow the accuracy tests required. A method of selection of spectral

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37

David, Jean-Yves. "Modern spectral analysis techniques for blood flow velocity and spectral measurements with a 20 MHZ pulsed doppler ultrasound catheter." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/17791.

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38

Gariba, Munir Antonio. "Visualisation methods for the analysis of blood flow using magnetic resonance imaging and computational fluid dynamics." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322530.

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39

Long, Xuguang. "Application of time-frequency analysis to Doppler ultrasound blood flow signals for detection of small stenoses." Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390610.

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40

Bathe, Mark 1975. "A fluid-structure interaction finite element analysis of pulsatile blood flow through a compliant stenotic artery." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9842.

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41

Singh, Shelly Deokie. "Computational analysis of blood flow and stress patterns in the aorta of patients with Marfan syndrome." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45539.

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Анотація:

Personalised external aortic root support (PEARS) was designed to prevent progressive aortic dilatation, and the associated risk of aortic dissection, in patients with Marfan syndrome by providing an additional support to the aorta. The objective of this thesis was to understand the biomechanical implications of PEARS surgery as well as to investigate the altered haemodynamics associated with the disease and its treatment. Finite element (FE) models were developed using patient-specific aortic geometries reconstructed from pre and post-PEARS magnetic resonance (MR) images of three Marfan patie

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42

Swanepoel, A. C. (Albe Carina). "Ultrstructural and flow cytometric analysis of platelets and fibrin networks during the menstrual cycle and pregnancy." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/32969.

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Анотація:

INTRODUCTION: The menstrual cycle and pregnancy are processes unique to women. Both these processes involve various hormones as well as the coagulation system. Throughout normal pregnancy, platelet activation and increase in blood coagulation factors contributes to the hypercoagulable state observed on a physiological level. METHODS: Fibrin networks and platelets were analysed by electron microscopy and flow cytometry to determine any differences found in different phases of pregnancy compared to healthy control individuals. The fibrin networks from different phases of the menstrual cycle as w

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43

Wright, Andrew William. "Umbilical arterial flow analysis to determine an index of placental impedance." Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/27050.

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Анотація:

Umbilical flow velocity waveforms (FVW' s) can be measured non-invasively using Doppler ultrasound. Changes in the FVW's occur long before the warning signs from other conventional monitoring methods. Correct interpretation of the changes in the FVW has the potential of providing the clinician with an early warning of foetal distress. A number of indices have been described in the literature to characterise the FVW including the Pulsatility Index (PI), the Resistance Index (RI) and more recently, the High Resistance State Index (HRSI). Researchers have shown a dependence of the FVW, and thus t

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44

ROSSI, DOMENICO. "In-flow physical-morphological analysis of PBMC in microfluidic device by light scattering." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2644903.

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Анотація:

Morphological detailed informations of living blood cell are retrieved with an approach based on light scattering coupled to a cell 3D alignment in a centreline of a microfluidic self made apparatus. Cell’s informations are collected over a widespread angle, spanning from 2 to 30 degrees, with an angular resolution of 0.1022 degrees. Cells are investigated in their natural state, and such "label-free" approach of analysis significantly differs from other technique based on scattering of light, such as flow cytometry. Such a characterisation permits to obtain detailed informations, giving the p

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45

Miller, Brandon Lee. "Quantitative, Multiparameter Analysis of Fluorescently Stained, Negatively Enriched, Peripheral Blood from Cancer Patients." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386005404.

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46

Patz, Ralf. "Time-frequency analysis of Doppler ultrasound blood flow signals : an investigation into automated diagnosis of vascular disease." Thesis, University of South Wales, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289393.

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47

Celestin, Carey Jr. "Computational Fluid Dynamics Applied to the Analysis of Blood Flow Through Central Aortic to Pulmonary Artery Shunts." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/1972.

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Анотація:

This research utilizes CFD to analyze blood flow through pathways representative of central shunts, commonly used as part of the Fontan procedure to treat cyanotic heart disease. In the first part of this research, a parametric study of steady, Newtonian blood flow through parabolic pathways was performed to demonstrate the effect that flow pathway curvature has on wall shear stress distribution and flow energy losses. In the second part, blood flow through two shunts obtained via biplane angiograms is simulated. Pressure boundary conditions were obtained via catheterization. Results showe

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48

Köhler, Benjamin [Verfasser], and Bernhard [Akademischer Betreuer] Preim. "Guided qualitative and quantitative analysis of cardiac 4D PC-MRI blood flow data / Benjamin Köhler ; Betreuer: Bernhard Preim." Magdeburg : Universitätsbibliothek, 2016. http://d-nb.info/1118572181/34.

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49

Mutema, Jonsson Carla. "Evaluation of Flow Cytometric Methods Used in Analysis of Immune Cells in Patients with Malignant Lymphoma." Thesis, Uppsala universitet, Institutionen för kvinnors och barns hälsa, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326010.

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Анотація:

Malignant lymphomas are a group of cancerous diseases that develop from lymphocytes and primarily affect lymph nodes. Being the sixth most common cancer type in Sweden, lymphoma is a societal problem that needs to be tackled by improving care and treatment of patients. This study was designed to examine the blood cell composition in lymphoma patients and well as determine whether the use of cryopreserved cells affected the analysis outcome. An evaluation of the methods used was also performed. Frozen peripheral blood from lymphoma patients as well as fresh and frozen blood from healthy control

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Carvalho, Julene de Souza. "Analysis of the clinical utility of a modified plethysmographic method for indirect measurement of instantaneous pulonary capillary blood flow." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362366.

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