IAN HOOTON / SCIENCE PHOTO LIBRARY IAN HOOTON / SCIENCE PHOTO LIBRARY
Obstetric ultrasound. Expectant parents listening to an obstetrician explain an ultrasound scan of the foetus inside the mother's abdomen. The image is obtained by an �transducer (held against the abdomen), which emits high frequency sound waves that are echoed back and used to create an image of the foetus inside the mother's womb. This is a safe, non-invasive method of assessing the health of the developing foetus.
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