Which statement best compares an echocardiogram and a Doppler flow study?

An echocardiogram uses ultrasound sound waves to create images of the heart and assess its structure and movement. A Doppler flow study also uses sound waves, measuring how they reflect from moving blood to show its direction and speed. Thus, both use sound waves to examine the heart, making “Both utilize sound waves to produce images of the heart” the best comparison.

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