BLUESTONE / SCIENCE PHOTO LIBRARY BLUESTONE / SCIENCE PHOTO LIBRARY
Foetus. Ultrasound scan of a human foetus seen from the side. The head is at centre with the torso at lower left. A transducer placed on the woman's abdomen produced high frequency sound waves which were reflected back to the transducer by the foetus' tissues. Ultrasound enables the health of the foetus to be assessed at an early stage and allows the date of birth to be determined more accurately.
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