A noninvasive test that uses high-frequency sound waves to produce images that are captured in real time and show structure, movement, and the flow of blood through blood vessels is called:

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Ultrasound is a noninvasive test that uses high-frequency sound waves to produce real-time images of the body's internal structures, including movement and blood flow. Doppler imaging is a specific type of ultrasound used to measure blood flow.

A Noninvasive Test That Uses High-Frequency Sound Waves to Produce