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. 2023 Dec 4;19(10):e807–e831. doi: 10.4244/EIJ-E-22-00018

Figure 5. Pseudo-Fractal Geometry and Dedicated QCA.

Figure 5

Without implementation of dedicated bifurcation algorithms, taking into account the natural step-down phenomenon of the vessels in presence of bifurcations, the single-vessel QCA leads to erroneous estimation of the main vessel and side branch reference diameters, with over/underestimation of related stenosis. D: distal; DS: diameter stenosis; LM: left main coronary artery; M: main vessel; P: proximal; QCA: quantitative coronary analysis; S: side branch.