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Doppler Ultrasound Doppler ultrasound is a test that uses sound waves to create images and sounds of your blood flow. This test can detect narrow or blocked arteries, or blood clots in the veins. It can be done on the neck, legs, or arms. A hand-held probe placed against the skin emits sound waves. The sound waves bounce off the moving blood and echo back to the probe. The echo is translated into an image that appears on a screen. This test involves no radiation and is harmless.