Fig. 4
From: Role of imaging in the evaluation of vascular complications after liver transplantation
The usefulness of spectral curves on the assessment of hepatic artery stenosis. Even in cases of normal colour Doppler examination (a), spectral curves should be obtained. They show a characteristic pattern before and after the stenosis. In the prestenotic segment (b), we can appreciate high peaks and an elevated resistive index. In the poststenotic segment (c), we can see a parvus et tardus pulse and a low resistive index. Angiography can help confirm the diagnosis (d) and perform the treatment (e)