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Panels A–C show scatter-plot of whole cycle Pd/Pa, iFR, and contrast-FFR values (x axis) and adenosine-FFR values (y axis) of all lesions and the correlation coefficient; Panel D shows the area under curve for whole cycle Pd/Pa, iFR, and contrast-FFR for diagnosing a positive FFR lesion (≤0.80). FFR, fractional flow reserve; iFR, instantaneous wave-free ratio; Pd/Pa, the ratio of mean distal coronary pressure (Pd) to the mean pressure observed in the aorta (Pa)
