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Figure 4 (A) Comparison between simultaneously obtained velocity- and pressure-derived collateral flow indices (CFI_v, vertical axis; CFI_p, horizontal axis). There is a direct, significant correlation between CFI_v and CFI_p. (B) Bland-Altman analysis of the average between CFI_v and CFI_p (horizontal axis) and the difference between CFI_v and CFI_p (vertical axis).

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