Fig. 2

Scatterplots illustrating the correlation between carotid pressure ratio (CPR) and key hemodynamic parameters: (A) cerebral blood flow asymmetry index (CBF-AI) (y = 0.18x + 0.83, R² = 0.23, P < 0.01); (B) diameter of the most severe stenosis (DMS) (mm) (y = 3.10x – 0.31, R² = 0.27, P < 0.01). (C) the degree of stenosis based on the NASCET method (%) (y = -53.9x + 105, R² = 0.23, P < 0.01). (D) cerebral vascular reserve (CVR) (%) (y = 72.6x – 12.6, R² = 0.38, P < 0.01). Each linear regression line represents the trend of the relationship. A statistically significant correlation was observed between CPR and all parameters. R² values were calculated using simple linear regression analysis to illustrate the strength of linear trends in these relationships. Note: Scatter plots include both pre- and post-stenting values of CPR, DMS, and NASCET stenosis rate to visualize the full spectrum of hemodynamic changes.