Influence of boundary conditions on an ultrasound backscattering model of blood

Influence of boundary conditions on an ultrasound backscattering model of blood by Elaine Y.L Lui Download PDF EPUB FB2

Influence of boundary conditions on a one-dimensional ultrasound backscattering model of blood Article in Ultrasound in Medicine & Biology 27(4) May with 28 Reads How we measure 'reads'. Ultrasound is the first-line tool for screening hepatic steatosis. Statistical distributions can be used to model the backscattered signals for liver characterization.

With the exception of digital X-ray exams, ultrasound is the leading imaging modality worldwide and in the United States. The key strengths of diagnostic ultrasound are its abilities to reveal the mechanical structure of anatomy, the dynamic movement of organs, and details of blood flow in real time.

The culminating effect of tissue on Influence of boundary conditions on an ultrasound backscattering model of blood book as it travels through the body is attenuation. Attenuation is the decreasing intensity of a sound wave as it passes through a medium.

It is the result of energy absorption of tissue, as well as reflection and scattering that occurs between the boundaries of. A computer model for simulating ultrasonic scattering in biological tissues with high scatterer concentration. Number 9, by randomly distributed slabs, with reference to the scattering of ultrasound by blood, was developed by Routh et al.

The incident waves and the scattered waves satisfy the exact boundary conditions, and Cited by: Weng X, Cloutier G, Beaulieu R, Roederer GO. Influence of acute-phase proteins on erythrocyte aggregation.

American Journal of Physiology-Heart and Circulatory Physiology. ;(6):H– [6] Boynard M, Lelievre JC, Influence of boundary conditions on an ultrasound backscattering model of blood book R.

Aggregation of red blood cells studied by ultrasound backscattering. Biorheology. ;24(5)– [7]Author: Boris Chayer, Louise Allard, Zhao Qin, Julian Garcia-Duitama, Laurence Roger, François Destrempes, J.

Influence of boundary conditions on an ultrasound backscattering model of blood book Doinikov et al, a model was developed in order to compute the radial profile of a bubble near an elastic wall of finite thickness, and therefore consists of more than two image bubbles in order to capture all of the boundary conditions at the various interfaces (figure 2(b)).

() Open and traction boundary conditions for the incompressible Navier–Stokes equations. Journal of Computational Physics() Effect of Domain Shape Modeling and Measurement Errors on the 2-D D-Bar Method for by: As such, Model D may be the most practical method for accurately simulating interstitial ultrasound bone ablation, with Model B preferable in cases when the bone is less than mm thick.

Simulations produced temperature profiles and ablated volumes that closely matched experimental data in size and shape (Figures 6 - -9, 9,11, 11,12 Cited by:   Simulation approach.

In this simulation, each RBC particle was assumed to be a sphere of an equivalent radius of 4 μm and mass of ×10 −13 kg.

For the initial condition, RBC particles were randomly distributed without overlapping throughout a rigid two-dimensional tubular space with a diameter of mm and a length of 1 mm and a corresponding hematocrit of 30%.Author: Cheong-Ah Lee, Qi Kong, Dong-Guk Paeng, Dong-Guk Paeng. Doppler Ultrasound in Obstetrics and Gynecology Dev Maulik Expanded and updated edition highlighting current standards and breakthroughs in the technology of Doppler ultrasound Includes latest advances in 3D and color doppler and 4D fetal echocardiography Includes more than illustrations, including more than in color.

The work in [] describes the method applied to biological and non-biological particles in mathematical model of blood flow and pressure has been presented in [16,17].Adequate cellular biophysical data can be extracted without invasion due to ultrasound scattering, which allows tissue characterization and determination of red blood cell aggregation [18,19].Author: Vytautas Ostasevicius, Vytautas Jurenas, Ievgeniia Golinka, Rimvydas Gaidys, Algiment Aleksa.

A Spiral Computerized Tomography (CT) scan of the aorta were obtained from a single subject and three model variations were examined. Computational fluid dynamics modeling of all three models showed variations in the velocity contours along the aortic arch with differences in the boundary layer growth and recirculation by: The following operating conditions were determined: m 3 /min volumetric flow at a load of 25 m, velocity of rotation of rpm, and specific velocity of 0.

The ANSYS CFX software with the k-ε turbulence model was used for simulation with appropriate boundary conditions. Computational studies on the evaluation of bone status in cases of pathologies have gained significant interest in recent years. This work presents a parametric and systematic numerical study on ultrasound propagation in cortical bone models to investigate the effect of changes in cortical porosity and the occurrence of large basic multicellular units, simply called non-refilled resorption Cited by: 3.

A review of the scattering of plane waves from random media. If the random scattering medium is a tenuous distribution of particles, then single-scatter theory 1 is adequate to explain many experimental observations.

In the single-scatter approximation, the incident wave is essentially unchanged as it propagates through the scattering medium, and the particles are assumed to interact with Cited by: "The influence of boundary conditions on the accuracy of diffusion theory in time-resolved reflectance spectroscopy of biological tissues," Physics in Medicine and Biology 40(11) () [PDF].

The lumen boundary in the human coronary artery is the contour edge of a blood vessel. The intravascular ultrasound (IVUS) is the medical imaging modality used to view the lumen boundary by the clinicians to detect the coronary artery disease called : Hannah Sofian, Joel C.

Than, Norliza Mohd Noor, Suraya Mohamad. Computational Blood Cell Mechanics. Simulating blood cells for biomedical applications is a challenging goal.

Whether you want to investigate blood flow behavior on the cell scale, or use a blood cell model for fast computational prototyping in microfluidics, Computational Blood Cell Mechanics will help you get started, and show you the path forward. Purchase Ultrasonics International 93 - 1st Edition.

Print Book & E-Book. ISBNBook Edition: 1. Computational Biomechanics of Human Red Blood Cells in Hematological Disorders Xuejin Li. Aggregation of Red Blood Cells Studied by Ultrasound Backscattering,” Inflow/Outflow Boundary Conditions for Particle-Based Blood Flow Simulations: Application to Arterial Bifurcations and Trees Cited by: () Open and traction boundary conditions for the incompressible Navier–Stokes equations.

Journal of Computational Physics() Autonomous Navigation of Vehicles from a Visual Memory Using a Generic Camera by: Proc. SPIEOptical Diagnostics of Biological Fluids III, pg 14 (19 June ); doi: / CONFERENCE PROCEEDINGS Papers Presentations Journals. Advanced Photonics Journal of Applied Remote Sensing.

ULTRASOUND, L. Cardoso, (CUNY, New York – USA) 14h50 – 15h50 Backscattering & Porous media Chairs: Quentin Grimal & Dean Ta 14h50 – 15h10 CORRELATIONS BETWEEN MICROSTRUCTURE AND APPARENT ULTRASONIC BACKSCATTER MEASUREMENTS OF HUMAN CANCELLOUS BONE, A.

Viano, J. Ankerson, J. This book addresses issues of scattering theory and biomedical engineering, as well as methodological approaches and tools from related scientific areas such as applied mathematics, mechanics, numerical analysis, and signal and image processing.

Sample Chapter(s) Introductory Talk Dedicated to the Memory of Ralph E. Kleinman ( KB). An assessment of the DORT method on simple scatterers using boundary element modelling.

Phys med biol, Guidance on reporting ultrasound exposure conditions for bio-effects studies. Ultrasound med biol, Influence of ablated tissue on the formation of high-intensity focused ultrasound lesions. Full text of "Ultrasonic tissue characterization" See other formats. Essential Applications of Musculoskeletal Ultrasound in Rheumatology, by Richard Wakefield & Maria Antonietta D’Agostino, assists you in most effectively using musculoskeletal ultrasound to diagnose and monitor the progression of rheumatoid arthritis, vasculitis, and other rheumatic and soft tissue disorders.

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An anterior chamber intraocular lens has had the support haptics dislocate posterior to the iris plane and can be seen as typical foreign body echogenic reflections (arrows). Hypotony is easily diagnosed by direct measurement of intraocular pressure, but the underlying cause is difficult to evaluate.

11 High-frequency ultrasound scans can. c) Experimental ultrasound methods for UCA will be presented for charac- terizing the bubbles in a UCA, like harmonic and subharmonic scattering, absorption and attenuation. Also the influence of ambient pressure, temperature and gas concentration will be discussed.

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Optical Tomography, Photon Migration, and Spectroscopy of Tissue and Model Media: Theory, Human Studies, and Instrumentation (Proceedings of SPIE, Vol. By B Chance and RR Alfano (Editors).and conduction are computed with classical boundary-layer laws using equations of TEB. 60 Modeling and Simulation in Engineering Conversely to the TEB scheme, DARTEB uses a 3-D cell discretization, in addition to the layer discretization of roofs, walls and roads: modeling is.

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[Olaf Dössel; Wolfgang C Schlegel]. Ultrasound backscattering outperforms the clinically used ultrasound parameters in discrimination of osteoporotic-like human trabecular bone samples. Karjalainen JP et al. Ultrasound backscatter imaging provides frequency-dependent information on structure, composition and mechanical properties of human trabecular bone.

Karjalainen R. Characterization of the Reversibility of Wolfram Cellular Automata with Rule Number and Periodic Boundary Conditions (O. Garcia Delgado, L. Hernandez Encinas, S. Hoya White, A. Martin del Rey and G.

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The 57th Open Seminar on Acoustics OSA' Gliwice, Poland, Ebook 20 - 24, This national Seminar, ebook some foreign guests, in this year is organized by Upper Silesian Division of the Polish Acoustical Society, with cooperation of Institute of Physics - Science-Didactics Center at Silesian University of Technology and Acoustics Committee of Polish Academy of Sciences.

In this Author: Bukowski, Roman.