In ultrasound scanning, a device called a transducer emits high-frequency sound waves and receives their echoes to produce images on a monitor. To ensure good contact between the transducer and the body, the radiographer places gel on the skin over the area to be examined before moving the transducer over it. An ultrasound scan takes 10–30 minutes and is completely painless.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.
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