A Doppler flow meter is used to measure the speed of
Chapter 16, Problem 16.104(choose chapter or problem)
A Doppler flow meter is used to measure the speed of bloodflow. Transmitting and receiving elements are placed on theskin, as shown in Fig. 16-42. Typical sound-wave frequenciesof about 5.0 MHz are used, which have a reasonable chanceof being reflected from red blood cells. By measuring thefrequency of the reflected waves, which are Doppler-shiftedbecause the red blood cells are moving, the speed of theblood flow can be deduced. Normal blood flow speed isabout 0.1 m/s. Suppose that an artery is partly constricted,so that the speed of the blood flow is increased, and the flowmeter measures a Doppler shift of 780 Hz. What is the speedof blood flow in the constricted region? The effective anglebetween the sound waves (both transmitted and reflected)and the directionof blood flowis 45. Assume thevelocity of soundin tissue is1540 m/s.FIGURE 16-42 104.
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