ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Doppler ultrasound scan. Screenshot of an ultrasound scan of blood flow in the carotid arteries of a 93 year old male patient. The patient has previously suffered a transient ischaemic attack (TIA, or 'mini stroke'). Photographed at the Western General Hospital stroke unit, Edinburgh, UK.
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