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Figure 1: Transverse B-mode and color-flow imaging of carotid artery obtained at the level of carotid bifurcation into internal carotid artery (ICA) and external carotid artery (ECA). Internal jugular vein (IJV) is seen overlying the two. Note the difference in the colors - both ECA and ICA show positive Doppler frequency shift (red), while IJV shows negative Doppler frequency shift (blue)

Figure 1: Transverse B-mode and color-flow imaging of carotid artery obtained at the level of carotid bifurcation into internal carotid artery (ICA) and external carotid artery (ECA). Internal jugular vein (IJV) is seen overlying the two. Note the difference in the colors - both ECA and ICA show positive Doppler frequency shift (red), while IJV shows negative Doppler frequency shift (blue)