Changing the color baseline to avoid aliasing. (a) On a color Doppler flow US image, flow within the portal vein appears green, the color equivalent of aliasing on the selected color bar. The color baseline (arrow) is positioned too high on the color bar. Although the US image helps confirm the presence of flow, the baseline should be lowered to obtain meaningful directional flow data. (b) On a color Doppler flow US image obtained after the baseline was lowered (arrow), accurate directional flow data have been obtained from the main portal vein: Appropriate antegrade portal venous flow toward the transducer appears red. 
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