A change in the frequency of waves, such as sound or light, received by an observer, when the source is moving relative to the observer. The frequency increases when the source is approaching and decreases when it is retreating. The Doppler effect is used in a number of medical applications...
doi:DE2418426 A1LANZ, WERNER, DIPL.-PHYS. DR.MED., MUENCHENDE2418426A1 * Apr 17, 1974 Oct 30, 1975 Werner Dipl Phys Dr Med Lanz Ultrasonic Doppler effect applied to locate arteries and veins - ensuring successful medical puncture at first attempt...
Medical Definition Doppler effect noun : a change in the frequency with which waves (as sound, light, or radio waves) from a given source reach an observer when the source and the observer are in motion with respect to each other so that the frequency increases or decreases according to...
The Doppler effect occurs because the shift in frequency is proportional to the speed of movement between the source and the receiver and therefore, it can be used to measure this speed. In medical imaging, the Doppler effect was initially used to measure the velocity of blood in large vessels...
The Doppler effect also has applications in medical physics. In a Doppler echocardiogram, sound waves of a certain frequency are channeled into the heart and reflect off of blood cells moving through the heart and blood vessels. Similar to the Doppler radar, cardiologists can understand the speed...
Doppler radar, which uses the Doppler effect to calculate the speed of moving objects, is a form of technology used not only by law-enforcement officers, but also by meteorologists. The change in frequency experienced as a result of the Doppler effect is exactly twice the ratio between the ...
Noun1.echocardiography- a noninvasive diagnostic procedure that uses ultrasound to study to structure and motions of the heart diagnostic procedure,diagnostic technique- a procedure followed in making a medical diagnosis Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University...
Doppler ultrasonography uses what is called the Doppler effect to measure the rate and direction of blood flow in the vessels. Just as a siren's pitch sounds higher when its source is moving toward you and lower as it moves away, so too will ultrasound waves change pitch, or frequency, as...
Doppler ultrasound uses the Doppler effect created by moving objects, such as blood cells which are flowing through a blood vessel, to depict flow information. The Doppler effect consists of an acquired change in frequency of an ultrasound wave which occurs when the ultrasound wave is reflected of...
a Doppler mode image representing velocity of a moving target object with spectral Doppler by using a Doppler effect, a color Doppler mode image representing velocity of the moving target object with colors by using the Doppler effect, an elastic image representing mechanical characteristics of tissues...