B-mode with a color Doppler image of the quadrate and right medial hepatic veins. The Doppler gate is placed within the quadrate hepatic vein with 1.5 mm of sample volume. Note the location of the two blood vessels and the gall bladder (GB), and the parallel relationship between the Doppler beam and the quadrate hepatic vein (QHV). RMHV, right medial hepatic vein.