Contrast-enhanced ultrasound Liver Imaging Reporting and Data System: Lights and shadows in hepatocellular carcinoma and cholangiocellular carcinoma diagnosis

Figure 4 Bangdiwala’s agreement charts of the Contrast-enhanced ultrasound Liver Imaging Reporting and Data System class assignments between different raters. In the case of perfect agreement, the k rectangles are represented by perfect squares and the shaded squares determined by the diagonal cell entries are exactly equal to the rectangles; lesser agreement is visualized by comparing the area of the blackened squares to the area of the rectangles. A: Agreement chart between the two internal raters (1 and 2), with the exclusion of LR-1 and LR-2 classes due to their rarity (n = 505); B-D: Agreement charts among the three raters from different centres (2, 3, and 4) for the subgroup of 50 nodules. We list the agreement charts between raters 2 and 3 (B), between raters 2 and 4 (C), and between raters 3 and 4 (D).