Doppler ultrasound is a non-invasive medical test that measures blood flow and pressure using high frequency sound waves. As these sound waves pass through the blood vessels, doctors are able to capture images that helps estimate the speed and measure of blood flow in the major arteries and veins in the body.
Using this technology doctors are able to evaluate the flow of blood through the major arteries and veins in the body (especially the in the neck, arms and leg); this in turn helps them zero in on blocked arteries, narrowing arteries, blood clots in the veins, or reduced blood flow to a particular region - all potentially fatal occurrences; undetected these lead to strokes, or heart failures.
There are different types of Doppler ultrasound tests; these include color Doppler ultrasound, pulsed Doppler ultrasound, and power Doppler ultrasound.
A Doppler ultrasound examination helps track blood flow through the blood vessels as well as detects abnormalities in blood flow.
It is an important test to determine the following:
During a Doppler ultrasound test, an instrument called a transducer is passed over the skin where the targeted blood vessel is located. This instrument sends and receives sound waves through the blood vessels. As the blood flows, the movement causes changes in the pitch of the reflected waves - this is called the Doppler Effect. This information is gathered from the sound waves and processed on a computer. The procedure takes from 30-60 minutes.