Color Doppler Flow Imaging: and other advances in Doppler by P. Peronneau, B. Diebold, J. P. Guglielmi, O. Lanusel, R. PDF

By P. Peronneau, B. Diebold, J. P. Guglielmi, O. Lanusel, R. Bele, J. Souquet (auth.), J. Roelandt MD (eds.)

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Extra info for Color Doppler Flow Imaging: and other advances in Doppler echocardiography

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For all hole diameters and driving pressures the measured mean flow is lower than that calculated from the Bernoulli relation. This is, according to the theory, for the 3 and 5 mm orifices due mainly to contraction of 34 Ultrasound Blood flow .. '. '. ·v· . ~":-- '. Transit time, Tt v Figure 3. Ultrasound Doppler measurement of blood flow velocity. e. the scatterers. in the ultrasound beam. the flow, while friction becomes important at the 1 mm orifice. The maximal flow velocity of the jet can be expected to be close to the theoretical one except for the holes with the smallest diameters.

He described the processes that occur at the inlet region and at the area distal to the obstruction. In a laboratory model the theory was tested. Several nozzle designs were used to represent different degrees in severity of the stenosis. When energy losses at the inlet were considered the following relationship could be derived when the fluid passes from tap I to tap II in Fig. 2. (4) The velocity proximal to the obstruction is assumed to be low as compared to the velocity at the site of the stenosis.

The report contains together with all the information on identification, used Doppler technique, and the results, the information about the variability. This information is helpful for the clinician as it gives an indication on the reliability of the results, for clinical decision making. Due to the combination of manual input and automated data acquisition, the user has full control over the analysis procedure. At any time during the analysis the user can verify the retrieved or calculated results and decide whether or not he accepts the results or discard them.

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