BSIP, BERANGER / SCIENCE PHOTO LIBRARY BSIP, BERANGER / SCIENCE PHOTO LIBRARY
Heart ultrasound. View of a male patient (in the background) undergoing an echocardiography test. In the foreground a medical technician adjusts the ultrasound controls. This technique produces an image of the heart by using ultrasound (harmless, high-frequency sound waves). It is mostly used to detect functional abnormalities of the heart wall, the heart valves and the large blood vessels connected to the heart. The sound waves are transmitted by a set of transducers placed on the chest of the patient. The echoes from the different transducers are detected, amplified and then combined to produce a two-dimensional image on a TV screen.
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