A Doppler ultrasound shows a three-dimensional, moving image of various parts of the body. This type of test is very similar to the ultrasound test done on pregnant women.
The ultrasound machine emits sound waves at a frequency that people can’t hear. As the sound echoes off of the body’s fluids and tissues, the machine records and measures how the waves are reflected back. The machine measures even tiny changes in each sound wave’s pitch and direction. As the waves “echo” off of the blood vessels, the waves show:
Doppler ultrasound shows real-time images. For instance, it shows the actual movement of blood through arteries. So doctors use the test to find blockages in various parts of the body:
Doppler ultrasound technology is also used in an echocardiogram, which is a moving image of the heart.
When you have a Doppler ultrasound, you may need to partly or fully undress and put on a hospital gown. You then lie on an exam table. The technician spreads gel on your skin on the area to be tested (for instance, the neck or leg).
The gel helps transmit the sound waves. The technician then moves a pen-link instrument (called a transducer) around on your skin.
The machine senses the echoes of the sounds waves as they reflect off of your body. The machine’s computer screen then shows the resulting image: a moving picture of your blood vessels.
Ultrasound is a painless procedure. However, you may experience some discomfort as the sonographer guides the transducer over your body, especially if you’re required to have a full bladder.

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