SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Doppler ultrasound. A patient undergoing a doppler ultrasound investigation of the common carotid artery in the neck. Doppler ultrasound gives a view of the speed of blood flow in a vessel and is an important diagnostic tool in cases of carotid artery stenosis. Undiagnosed, carotid artery stenosis can cause strokes. Photographed at the Skilfosovksy Emergency Care Research Institute in Moscow, Russia in 2010.
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