The mean follow-up was 18 months (range 1-54 months). Table 5 summarizes the mean velocities and ICA to CCA ratios for = 30 to < 50%, = 50 to < 70%, and = 70 to 99% in-stent restenosis ...

of the internal and common carotid arteries and the ICA to common carotid artery (CCA) PSV ratios were recorded. The velocities for the PSV ratio were taken as close as possible to the lesion.