ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Pregnancy ultrasound scan. Pregnant woman undergoing an ultrasound examination. The doctor scans her abdomen with a transducer that emits high frequency sound waves. The differential reflection of these sound waves by body tissues allows an echo map of the developing foetus to be constructed. Ultrasound scanning is performed about 16 to 18 weeks into pregnancy. It is used to monitor foetal growth, and can detect multiple pregnancies and gross abnormalities such as spina bifida.
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