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Fig. 1A. —76-year-old asymptomatic man with normal carotid and
vertebral spectral tracings. Doppler sonogram shows normal internal carotid
artery that supplies low-resistance vascular bed of brain and therefore has
low-resistance waveform. Note sharp rise in flow velocity during systole and
gradual tapering of continuously forward flow throughout diastole. Internal
carotid artery waveform tends to display more blunted systolic peak and
greater diastolic flow than is seen in external carotid artery waveform.
