A technique using ultrasound waves to determine blood flow.
A test done to diagnose obstructions and other abnormalities of the heart, arteries, and veins. It also serves to monitor patients who have had arterial or venous surgery such as a bypass.
The shift in frequency produced when an ultrasound wave is echoed from something in motion. The use of the Doppler effect permits measuring the velocity of that which is being studied (e.g., blood flow in a vessel).
In the realm of medical diagnostics, there exists a valuable procedure known as Doppler ultrasound. This diagnostic technique harnesses the power of reflected sound waves to assess and evaluate the flow of blood through significant arteries and veins within the body. By utilizing this method, healthcare professionals can gather critical information about the circulation of blood, aiding in the diagnosis and monitoring of various vascular conditions.
Doppler ultrasound scanning is a technique that measures the velocity of moving structures by detecting shifts in the frequency of ultrasonic waves. During the procedure, an emitter sends out pulses of specific-frequency ultrasound (inaudible, high-frequency sound). These pulses bounce off moving objects, like blood flowing through a blood vessel, and the frequency of the echoes differs from the emitted sound. A sensor picks up these frequency changes and converts the data into useful information, such as the speed of blood flow.
Doppler ultrasonography finds extensive application in detecting artery narrowing caused by atherosclerosis, which involves the buildup of fatty deposits on artery walls. It is also utilized for identifying blood clots in veins, such as those occurring in deep vein thrombosis. Apart from these medical uses, Doppler ultrasound techniques are employed to monitor the fetal heartbeat, detect air bubbles during dialysis and in heart-lung machines, and measure blood pressure.