A Pulsed Ultrasonic Doppler Velocity Meter For Use In The Measurement Of Blood Flow
Download A Pulsed Ultrasonic Doppler Velocity Meter For Use In The Measurement Of Blood Flow full books in PDF, epub, and Kindle. Read online free A Pulsed Ultrasonic Doppler Velocity Meter For Use In The Measurement Of Blood Flow ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads.
Author |
: Geoffrey Cusick |
Publisher |
: |
Total Pages |
: |
Release |
: 1974 |
ISBN-10 |
: OCLC:1313597434 |
ISBN-13 |
: |
Rating |
: 4/5 (34 Downloads) |
Synopsis A Pulsed Ultrasonic Doppler Velocity Meter, for Use in the Measurement of Blood Flow by : Geoffrey Cusick
Author |
: Stanford University. Stanford Electronics Laboratories |
Publisher |
: |
Total Pages |
: 146 |
Release |
: 1977 |
ISBN-10 |
: STANFORD:36105046381021 |
ISBN-13 |
: |
Rating |
: 4/5 (21 Downloads) |
Synopsis A Directional Pulsed-doppler Ultrasonic Blood Flowmeter by : Stanford University. Stanford Electronics Laboratories
Author |
: Won Yong Kim |
Publisher |
: |
Total Pages |
: 57 |
Release |
: 1995 |
ISBN-10 |
: OCLC:468280959 |
ISBN-13 |
: |
Rating |
: 4/5 (59 Downloads) |
Synopsis Blood Flow Measurements by Pulsed Doppler Ultrasound and Velocity Encoding Magnetic Resonance Imaging, with Special Reference to the Mitral Valve by : Won Yong Kim
Author |
: Matthias Messer |
Publisher |
: |
Total Pages |
: |
Release |
: 2005 |
ISBN-10 |
: OCLC:63160240 |
ISBN-13 |
: |
Rating |
: 4/5 (40 Downloads) |
Synopsis Pulsed Ultrasonic Doppler Velocimetry for Measurement of Velocity Profiles in Small Channels and Capplilaries by : Matthias Messer
Pulsed ultrasound Doppler velocimetry proved to be capable of measuring velocities accurately (relative error less than 0.5 percent). In this research, the limitations of the method are investigated when measuring: in channels with a small thickness compared to the transducer diameter, at low velocities and in the presence of a flow reversal area. A review of the fundamentals of pulsed ultrasound Doppler velocimetry reveals that the accuracy of the measured velocity field mainly depends on the shape of the acoustic beam through the flow field and the intensity of the echo from the incident particles where the velocity is being measured. The ultrasonic transducer turned out to be most critical component of the system. Fundamental limitations of the method are identified. With ultrasonic beam measurements, the beam shape and echo intensity is further investigated. In general, the shape of the ultrasonic beam varies depending on the frequency and diameter of the emitter as well as the characteristics of the acoustic interface that the beam encounters. Moreover, the most promising transducer to measure velocity profiles in small channels is identified. Since the application of pulsed ultrasound Doppler velocimetry often involves the propagation of the ultrasonic burst through Plexiglas, the effect of Plexiglas walls on the measured velocity profile is analyzed and quantified in detail. The transducers ringing effect and the saturation region caused by highly absorbing acoustic interfaces are identified as limitations of the method. By comparing measurement results in the small rectangular channel to numerically calculated results, further limitations of the method are identified. It was not possible to determine velocities correctly throughout the whole channel at low flow rates, in small geometries and in the flow separation region. A discrepancy between the maximum measured velocity, velocity profile perturbations and incorrect velocity determination at the far channel wall were main shortcomings. Measurement results are improved by changes in the Doppler angle, the flow rate and the particle concentration. Suggestions to enhance the measurement system, especially its spatial resolution, and to further investigate acoustic wave interactions are made.
Author |
: Colin Roberts |
Publisher |
: |
Total Pages |
: 192 |
Release |
: 1972 |
ISBN-10 |
: UOM:39015007102158 |
ISBN-13 |
: |
Rating |
: 4/5 (58 Downloads) |
Synopsis Blood Flow Measurement by : Colin Roberts
Author |
: Peter Atkinson |
Publisher |
: |
Total Pages |
: 308 |
Release |
: 1982 |
ISBN-10 |
: UOM:39015004438530 |
ISBN-13 |
: |
Rating |
: 4/5 (30 Downloads) |
Synopsis Doppler Ultrasound and Its Use in Clinical Measurement by : Peter Atkinson
Author |
: Yasushi Takeda |
Publisher |
: Springer Science & Business Media |
Total Pages |
: 278 |
Release |
: 2012-08-31 |
ISBN-10 |
: 9784431540267 |
ISBN-13 |
: 4431540261 |
Rating |
: 4/5 (67 Downloads) |
Synopsis Ultrasonic Doppler Velocity Profiler for Fluid Flow by : Yasushi Takeda
The ultrasonic velocity profile (UVP) method, first developed in medical engineering, is now widely used in clinical settings. The fluid mechanical basis of UVP was established in investigations by the author and his colleagues with work demonstrating that UVP is a powerful new tool in experimental fluid mechanics. There are diverse examples, ranging from problems in fundamental fluid dynamics to applied problems in mechanical, chemical, nuclear, and environmental engineering. In all these problems, the methodological principle in fluid mechanics was converted from point measurements to spatio-temporal measurements along a line. This book is the first monograph on UVP that offers comprehensive information about the method, its principles, its practice, and applied examples, and which serves both current and new users. Current users can confirm that their application configurations are correct, which will help them to improve the configurations so as to make them more efficient and effective. New users will become familiar with the method, to design applications on a physically correct basis for performing measurements accurately. Additionally, the appendix provides necessary practical information, such as acoustic properties.
Author |
: Jørgen Arendt Jensen |
Publisher |
: Cambridge University Press |
Total Pages |
: 344 |
Release |
: 1996-03-29 |
ISBN-10 |
: 0521464846 |
ISBN-13 |
: 9780521464840 |
Rating |
: 4/5 (46 Downloads) |
Synopsis Estimation of Blood Velocities Using Ultrasound by : Jørgen Arendt Jensen
A clear, extensively illustrated treatment of ultrasound systems used in estimating blood velocities.
Author |
: James W. Knutti |
Publisher |
: |
Total Pages |
: 212 |
Release |
: 1977 |
ISBN-10 |
: STANFORD:36105046381062 |
ISBN-13 |
: |
Rating |
: 4/5 (62 Downloads) |
Synopsis Totally Implantable Bidirectional Pulsed Doppler Blood Flow Telemetry by : James W. Knutti
Author |
: Minnan Xu |
Publisher |
: |
Total Pages |
: 79 |
Release |
: 2002 |
ISBN-10 |
: OCLC:51677789 |
ISBN-13 |
: |
Rating |
: 4/5 (89 Downloads) |
Synopsis Local Measurement of the Pulse Wave Velocity Using Doppler Ultrasound by : Minnan Xu