Fig. 10From: Role of imaging in the evaluation of vascular complications after liver transplantationUsefulness of spectral curves on the assessment of portal vein stenosis. Ultrasound examination shows multiple points of stenosis (a). Colour Doppler demonstrates turbulent flow (b). Spectral curves show a characteristic pattern before and at the stenosis. In the prestenotic segment (c), we can appreciate a low flow. In the stenotic segment (d), high-speed flow is seen (peak velocity over 125 cm/s). Stenotic/prestenotic ratio is a useful measurement. In this case, the result is clearly more than threeBack to article page