Fig 1. Scatter-plot of poststenotic blood flow versus resting regional cerebral blood flow (rCBF) (ml/100 g/min, (A), postacetazolamide rCBF on the ipsilateral side (ml/100 g/min, (B), or VR (C). The abscissa indicates poststenotic flow of the extracranial distal internal carotid artery (ml/s). Lines were drawn based on the linear regression equation. Regression coefficients and P values are shown in the figures.