Doppler ultrasounds are noninvasive diagnostic procedures that evaluate blood flow via your blood vessels by reflecting high-frequency sound waves (ultrasound) off of moving red blood cells. Normal ultrasounds make images using sound waves, but they cannot show blood flow. A Doppler ultrasound may determine how swiftly blood flows (frequency) by tracking the rate of change in pitch. With a tiny, hand-held tool (transducer) about the size of a bar of soap, a sonographer trained in ultrasound imaging applies pressure to your skin across the area of your body being scanned, moving from one location to another as necessary. This test may be used as an alternative to more invasive procedures like angiography, which entails injecting dye into the blood vessels to make them visible on X-ray imaging. A Doppler ultrasound may be used by your doctor to check for artery damage or to monitor a particular vein and artery therapy.
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