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Ultrasound Doppler evaluation of hepatic vessels. (a) Doppler ultrasound image and pulsed Doppler waveform of the hepatic artery in a recipient with liver transplantation. The waveform indicates a resistive index of 0.79 (normal range, 0.5–0.8). (b) The main portal vein shows a normal continuous waveform with mild velocity variations due to respiration. (c) The hepatic vein Doppler examination shows fluctuations across the baseline, which characterizes the normal triphasic pattern.
