AJ FILM / SCIENCE PHOTO LIBRARY AJ FILM / SCIENCE PHOTO LIBRARY
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Doctor performing a doppler ultrasound scan of a patient's heart. The scan, and the patient's heartbeat (yellow lines) can be see on the monitor. Ultrasound of the heart (echocardiography) shows internal structures, while doppler ultrasound shows the speed of blood flow. Combined they are a powerful diagnostic tool for investigating heart health.
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