SAMUEL ASHFIELD / SCIENCE PHOTO LIBRARY SAMUEL ASHFIELD / SCIENCE PHOTO LIBRARY
Pregnant woman and family looking at ultrasound scans of her unborn child. Images of a foetus can be produced using ultrasound. High frequency sounds are passed through the abdomen and the echoes 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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