Carotid Doppler ultrasonography is a popular tool for evaluating atherosclerosis of the carotid
artery. Its two-dimensional gray scale can be used for measuring the intima-media thickness,
which is very good biomarker for atherosclerosis and can aid in plaque characterization. The
plaque morphology is related to the risk of stroke. The ulceration of plaque is also known as
one of the strong predictors of future embolic event risk. Color Doppler ultrasonography and
pulse Doppler ultrasonography have been used for detecting carotid artery stenosis. Doppler
ultrasonography has unique physical properties. The operator should be familiar with the physics
and other parameters of Doppler ultrasonography to perform optimal Doppler ultrasonography
studies.