Inversion of spectral and color flow falsely suggesting reversal of portal venous flow. (a) On a color duplex US image obtained with spectral Doppler US as the active scanning mode, the spectral waveform is below the baseline, with appropriate color flow. (b) Color duplex US image obtained after the inversion button was reversed demonstrates appropriate directional flow, with the spectral waveform now appearing above the baseline. Note that the color bar does not change when the Doppler spectrum is inverted. 
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