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