GE MEDICAL SYSTEMS / SCIENCE PHOTO LIBRARY GE MEDICAL SYSTEMS / SCIENCE PHOTO LIBRARY
Foetal ultrasound. Three-dimensional (3-D) ultrasound scan of a human foetus. Its head is at upper left, and it appears to be sucking the thumb of its right hand. The umbilical cord is seen across its abdomen. The image was produced by a third generation 3-D ultrasound scanner called Voluson 730. Ultrasound is a diagnostic technique which sends high-frequency sound waves into the body via a transducer. The returning echoes are recorded and used to build an image of an internal structure.
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