BSIP, MENDIL / SCIENCE PHOTO LIBRARY BSIP, MENDIL / SCIENCE PHOTO LIBRARY
Breast ultrasound. Doctor's hand carrying out an ultrasound scan of a woman's breast. The transducer (centre) is moved over the breast. It emits very high frequency sound waves into the breast tissue and detects the reflected echoes. The results are used to build an image of the internal structure of the breast. Ultrasound scans are usually carried out when a breast abnormality has been found by palpation (physical examination) or mammography (breast X-ray). Ultrasound scans are used to distinguish between solid tumours and fluid-filled cysts. Ultrasound scanning may be used during tissue biopsy, to ensure that the correct region of the breast is sampled.
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