PAUL WHITEHILL / SCIENCE PHOTO LIBRARY PAUL WHITEHILL / SCIENCE PHOTO LIBRARY
Two pregnant women looking at ultrasound scans. Images of a foetus can be produced using ultrasound. High frequency sounds are passed through the abdomen using a transducer. The echoes are recorded to build up a picture of the foetus. It is a useful technique for monitoring the health and growth of a foetus, and can be used for gender determination.
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