Results 271 to 280 of about 7,146,269 (348)

Decorrelation-based blood flow velocity estimation: effect of spread of flow velocity, linear flow velocity gradients, and parabolic flow

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2002
In recent years, a new method to measure transverse blood flow, based on the decorrelation of the radio frequency (RF) signals has been developed. In this paper, we investigated the influence of nonuniform flow on the velocity estimation. The decorrelation characteristics of transverse blood flow using an intravascular ultrasound (IVUS) array catheter ...
Lupotti, F.A., Steen, A.F.W. van der, Mastik, F., Korte, C.L. de   +3 more
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Velocity-independent microfluidic flow cytometry

ELECTROPHORESIS, 2002
Pressure-driven flow in microfluidic channels is characterized by a distribution of velocities. This distribution makes it difficult to implement conventional flow cytometry data analysis. We have demonstrated a method to measure velocity as an independent parameter when performing microfluidic flow cytometry.
Shulamit, Eyal, Stephen R, Quake
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Velocity distribution in aortic flow

Cardiovascular Research, 1973
Velocity measurements in the dog aorta using a thin film anemometer are described. The instantaneous velocity profiles for the ascending and descending aorta indicate a large inertial core region with relatively thin boundary layers; pronounced non-uniformities are present in the ascending aorta.
C, Clark, D L, Schultz
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``Brillouin Flow'' with Thermal Velocities

Journal of Applied Physics, 1953
A type of electron flow in a constant magnetic field is described. The beam of electrons is supposed to be everywhere in thermal equilibrium and the usual Brillouin flow is found when the equilibrium temperature tends to zero. Some considerations are put forward bearing on the choice of a suitable beam temperature in specific problems.
Pierce, J. R., Walker, L. R.
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Correlation-based blood-flow velocity estimation: effect of transverse spread of flow velocity and flow velocity gradients

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121), 2002
In recent years, a new method to measure transverse blood flow, based on the decorrelation of the radio frequency (RF) signals has been introduced. We investigated the decorrelation characteristics of transverse blood flow using an intravascular ultrasound (IVUS) array catheter by means of computer modeling.
F.A. Lupotti, A.F.W. van der Steen
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Tsunami Flow Velocity

2013
G. Chock, I. Robertson, D. Kriebel, M. Francis, I. Nistor   +4 more
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Flow velocity measurements for pulsatile flow

Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1988
The inherent sensitivity of magnetic resonance imaging to motion makes it particularly well-suited as a noninvasive flow measurement modality. A pulse sequence which labels moving material by subjecting it to a pulse that inverts the longitudinal magnetization is discussed.
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Calculating Linear Flow Velocity from Volumetric Flow Rate

Cold Spring Harbor Protocols, 2010
INTRODUCTIONIn chromatography, flow rates should be standardized for columns of different dimensions by expressing the flow rate as linear flow velocity (cm/h). This is defined as the volumetric flow rate (cm3/h) per unit cross-sectional area (cm2) of a given column. However, flow rates are usually measured as volumetric flow rates (mL/min).
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Flow Velocities in Pipelines

Journal of Hydraulic Engineering, 1983
Most of the equations that have been developed for relating velocity of a stream in a partly filled pipe to the slope and size of the stream use hydraulic radius (R) as the parameter for size. The equations using this parameter are poor representations of flow behavior when comparing different relative depths of flow, as Camp pointed out for the case ...
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