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Showing 1 to 19 of 19 for “"Fractional flow"”.
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Multi-scale computational modeling of coronary blood flow: application to fractional flow reserve.
Introduction. Fractional flow reserve (FFR) is presently an invasive coronary clinical index. Non-invasive CT imaging combined with computational coronary flow modelling may reduce the patient’s burden of undergoing invasive testing. Research statement. The ability to obtain information of the …
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Validation of first pass magnetic resonance myocardial perfusion imaging using fractional flow reserve
Background - Magnetic Resonance Myocardial Perfusion Imaging (MRMPI) has been used for the detection of reversible myocardial ischaemia in humans since the early 1990’s. This non-invasive method of diagnosing reversible myocardial ischaemia has a number of advantages over the other more commonly …
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Comparison of clinical outcome after revascularization versus conservative treatment in patients with borderline fractional flow reserve measurements
BACKGROUND: Measurement of fractional flow reserve (FFR) is useful tool for assessing the functional severity of coronary artery stenosis and for clinical decision of treatment strategy. Many studies have shown that FFR measurement <0.75 is specific for ischemia, but there is a controversy about …
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Relationship Between Intravascular Ultrasound Parameters and Fractional Flow Reserve in Intermediate Coronary Artery Stenosis of Left Anterior Descending Artery
… parameters, including volumetric analysis, and fractional flow reserve (FFR). METHODS: Both IVUS and FFR were performed in 206 cases of intermediate stenosis of the left anterior descending artery (LAD). Myocardial ischemia was assessed by FFR and maximal hyperemia was induced by continuous …
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The relationship between intravascular ultrasound-derived percent total atheroma volume and fractional flow reserve in the intermediate stenosis of proximal or middle left anterior descending coronary artery
… descending artery (LAD). An IVUS study and fractional flow reserve (FFR) measurements performed in 130 patients with coronary angiographic intermediate stenosis of proximal or middle LAD. %TAV was calculated as the percentage of total vessel volume occupied by total atheroma volume on IVUS. …
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A Large Scale Network Model to Obtain Interwell Formation Characteristics
… injection and production rate data and well fractional flow values to develop a reservoir-scale network model. A Voronoi mesh divides the reservoir into a number of node volumes each of which contains a well. Bonds connect each of the nodes with conductance values that must be inferred from …
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Design and Evaluation of Permit Programs for Regulating Surface Water Withdrawal Under Riparian Legal System
… quantifiable objectives concludes that the fixed flow program is able to provide higher net benefit but more significant low flow frequency and withdrawal interruption frequency than the fractional flow program which rarely changes the general trend of the natural flow regime. The …
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Vergleich der Perfusionsdiagnostik mittels Magnetresonanztomographie mit dem invasiv bestimmten hämodynamischen Schweregrad von Koronarstenosen zur Detektion der hämodynamischen Relevanz von Stenosen der Koronararterien
… stenosis as defined by invasively determined fractional flow reserve at coronary angiography. All patients were examined in rest and under adenosine-stress on a clinical 1.5-T scanner (Intera, Philips). Stress perfusion imaging was performed using a continuous intravenous infusion of adenosine …
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Modeling of Foam Flow in Porous Media for Subsurface Environmental Remediation
… in a wide range of disciplines, foam flow in porous media has been spotlighted for improved/enhanced oil recovery processes in petroleum-bearing geological formations and shallow subsurface in-situ NAPL (non-aqueous phase liquid) environmental remediation in contaminated soils and …
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Characterization of Gas-Oil Flow in Cyclic Solvent Injection (CSI) for Heavy Oil Recovery
… CSI process is therefore governed by the gas-oil flow as the solvent chamber is dominated by the free gas-oil flow and the heavy oil zone by the dispersed gas-oil flow referred to as the foamy oil flow. The gas-oil flow in CSI eventually appears as the combined flow of free gas and foamy oil …
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Development of Smart Patient-Specific 3D Printed Vascular Phantoms for Assessment of Flow Dynamics and Treatment Simulations Using Embedded Sensors
… parameters such as blood pressure and flow rate are the first once affected by CVD. There have been various methods developed to study the flow dynamics using Computational Fluid Dynamics (CFD) which are computationally intensive and also uses unrealistic boundary conditions such as …
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Improving Coronary Artery Disease Diagnostics with Massively Parallel, Personalized Flow Models and Immersive Treatment Planning.
… driven by local hemodynamic forces, flow-generated endothelial shear stress (ESS), and pressure-derived tensile stress. These hemodynamic forces can be derived from sophisticated computational fluid dynamics (CFD) simulations. Personalized 3D CFD simulations based on patient-specific …
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The Application of Improved Numerical Techniques to 1-D Micellar/Polymer Flooding Simulation
Three examples of three phase flow models which have been developed are compared under various conditions. Although the dif-ference in oil recovery and surfactant trapping among the models was rather large with constant. salinity, a salinity gradient produced high oil recovery and low surfactant …
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Invasive Physiologic Assessment of Myocardial Viability After Primary Angioplasty in Acute Myocardial Infarction: Comparison With FDG-PET Imaging
… After successful PCI, Doppler-derived coronary flow reserve (CFRDoppler), microvascular resistance index (MVRI) and phasic coronary flow velocity patterns were evaluated. Using a pressure-temperature sensor-tipped coronary wire, thermodilution-derived CFR (CFRthermo), fractional flow reserve …
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Non-invasive Cardiovascular Magnetic Resonance Imaging in Patients with Ischemic Heart Disease
… imaging approach to the reference standard of fractional flow reserve (FFR) in 37 patients with suspected or known CAD. OS-CMR did identify abnormal myocardium supplied by coronary arteries with hemodynamically limiting stenoses, confirming a role for OS-CMR in the evaluation of myocardial …
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Heavy oil recovery by combined solvent and hot water (CS-HW) injection: Experimental, numerical and data mining-based analysis
… flooding (HWF) by sustaining the foamy oil flow and effectively delaying water and gas breakthrough times. A total of 21 laboratory tests including water flooding (WF), hot-water flooding (HWF), solvent injection, combined solvent and hot water (CS-HW) injection in a two-well configuration …
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Micromechanical study of two-phase flow during air sparging
… the fundamental mechanisms or the physics of air flow through porous media are not well understood. In this research, the micro-mechanics of air sparging are studied in order to understand the physical processes of air migration and air spatial occurring on the pore scale during air sparging. …
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A Multiscale Study of Foam: The Phase Behavior, Transport, and Rheology of Foam in Porous Media
… an in-depth multiscale understanding of the foam flow in porous media for subsurface applications such as gas mobility control, aquifer remediation, CO2 sequestration, water production control etc. In enhanced oil recovery (EOR), gas flooding has superior crude oil displacement efficiency where …