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Fig. 5C —57-year-old man with right-sided amaurosis fugax and innominate artery disease. Spectral patterns from right external carotid artery do not clearly show systolic spike or midsystolic deceleration. Waveform, however, is remarkable for large amount of diastolic flow. Resistive index is 0.52. Temporal tap was performed, as evidenced by transient oscillations (OSC), to further confirm that this vessel was external carotid artery (ECA).