Echocardiography. Female member of medical staff carrying out a doppler ultrasound scan (echocardiography) on a patient's heart. The scan determines the blood flow in the blood vessels and chambers of the heart. A transducer, held against the chest, produces high frequency sounds which reflect off the flowing blood, changing the frequency of the echoes. This alteration of frequency is known as the doppler effect. The resulting scan is shown on the monitor at left and is used to assess heart disorders.
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