Carotid Doppler scanning uses ultrasound to look at the flow of blood through blood vessels in the neck. The procedure is generally used to investigate disorders such as transient ischaemic attacks or stroke. Ultrasound waves from a transducer produce a picture of the blood flow, which can reveal narrowing of the carotid blood vessels in the neck. The procedure takes about 20 minutes and is painless and safe.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.