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Fig. 1D —76-year-old woman with ischemic posterior circulation. Blood flow volume on first-year follow-up spectral Doppler sonogram preceeding follow-up angiogram shows peak systolic velocity of 67 cm/s, resistive index of 0.76, acceleration time of 60 milliseconds, absolute acceleration of 516 cm/s², and blood flow volume of 194 mL/min.