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Introduction to Doppler.pdf

October 22, 2009 · Filed Under Medical Textbook  · Tags: , ,

Taken from Introduction: Doppler echocardiography is a method for detecting the direction and velocity of moving blood within the heart. As will be seen in this program, the technique may be used for detection of cardiac valvular insufficiency and stenosis as well as a large number of other abnormal flows. The current interest in Doppler echocardiography has reached a remarkable level in just the past few years. Doppler methods extend the use of cardiac ultrasound into the evaluation of normal and abnormal flow states and provide quantitative data that are essential in the clinical decision making process concerning patients with heart disease.

Understanding Doppler echocardiography begins with an understanding of the Doppler principle. All readers are familiar with the Doppler effect in every day life. For example, an observer stationed on a highway overpass readily notices that the pitch of the sound made from the engine of a passing automobile changes from high to low as the car approaches and then travels into the distance. The engine is emitting the same sound as it passes beneath, but the observer notices a change in pitch dependent upon the speed of the auto and its direction. Figure 1.1 demonstrates the changes in the frequency from an approaching and departing sound source (the moving automobile) relative to a stationary sound source.

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