Abstract
It is now recognized that relations exist between mechanical factor of blood and occurrence of atheromatous plates. Various phenomena can interfere, such as parietal friction, separated zones and instabilities. In particular, measurement of parietal flow depends on the instruments available and few of them are able to give an accurate evaluation of instantaneous local velocities without perturbing the blood flow. For this purpose, an ultrasonic Doppler method is proposed associating echo graphic and Doppler techniques whereby local velocities and gradient on the vascular wall can be obtained in vivo and in vitro. Specific procedures are established i) to get a convenient spatial resolution, ii) to provide calibrated values of the longitudinal component of velocities, involving a biangulation method.
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