DR BARRY SLAVEN / SCIENCE PHOTO LIBRARY DR BARRY SLAVEN / SCIENCE PHOTO LIBRARY
Ultrasound diagnosis. Ultrasound technician (left) and a surgeon carrying out an ultrasound scan at a patient's bedside in a hospital intensive care unit (ICU). Ultrasound (high-frequency sound waves) from a transducer are reflected by body tissues. These echoes are detected and used to build an image of structures inside the body.
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