CECILIA MAGILL / SCIENCE PHOTO LIBRARY CECILIA MAGILL / SCIENCE PHOTO LIBRARY
Pregnant woman showing her friend an ultrasound scan image of her unborn child. She is 7 months pregnant. 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. Photographed in Japan.
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