Figure 2.

Correlation plot of IVOCT plaque features, illustrating hierarchical clustering and distinct clusters of feature correlation. The correlation coefficient (R) values are plotted against each other. The color key represents the explained variances: R values < 0.5 are shown in black, while greater values are depicted in green or red with increasing intensity. Using a Spearman correlation coefficient threshold of 0.9, a total of 12 features, including minimum/mean lumen diameter, maximum FC area-1/2/3, FC surface area-1/2/3, and FC burden-1/2/3/T, were excluded from further analysis.