1. Fig. 5. Wave intensity analysis and concept of instantaneous wave-free ratio (iFR). Upper panel shows example of wave intensity analysis. Different types of waves originating from proximal and distal (from microcirculatory beds) sites during entire cardiac cycle are presented. After beginning of diastole and before start of systole, there is wave free period in which microvascular resistance is minimized and constant. iFR is calculated by ratio of proximal and distal pressures during this period (lower panel).
Fig. 5. Wave intensity analysis and concept of instantaneous wave-free ratio (iFR). Upper panel shows example of wave intensity analysis. Different types of waves originating from proximal and distal (from microcirculatory beds) sites during entire cardiac cycle are presented. After beginning of diastole and before start of systole, there is wave free period in which microvascular . . .
Korean J Radiol May-Jun;17(3):