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Fig. 1B. —76-year-old asymptomatic man with normal carotid and vertebral spectral tracings. Doppler sonogram shows external carotid artery that supplies high-resistance vascular beds of osseous and muscular structures of head and neck; thus, waveform is characterized by sharp rise in flow velocity during systole, rapid decline toward baseline, and diminished diastolic flow. Transient reversal in early diastole can be seen normally.