Figure 4:

Scatterplot of CT angiography–derived fractional flow reserve (CT FFR) and invasive FFR values. Color of the dots indicates degree of stenosis at coronary CT angiography, with low-grade stenosis (<25%, one vessel) in purple, intermediate-degree stenosis (25%–69%, 69 vessels) in blue, and high-grade stenosis (≥70%, seven vessels) in orange. Pearson correlation coefficient for all lesions was r = 0.55 and for intermediate stenosis only r = 0.56. Black lines indicate the cutoff value used for both invasive FFR (0.80) and CT FFR (0.80).