P. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY P. SAADA / EURELIOS / SCIENCE PHOTO LIBRARY
Corpus luteum in ovary. Colour doppler ultra- sound scan showing vascularisation in the human ovary after egg release (ovulation). At centre is a dark cavity from which an egg has erupted. This structure on the ovary is the corpus luteum, and is surrounded by blood vessels (yellow). Its role is to secrete hormones. This ultrasound scan was made by Dr Philippe Saada. Saada obtains such high-definition images by linking ultrasound to a numeric colour video. Doppler ultrasound uses high-frequency sound waves to determine whether body organs are normal, and can register moving particles like blood. Photographed at the Ultra- sound Centre of La Marjolaine at Montrouge, Paris.
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