Fig. 2

Bland–Altman plot of the percentage change of tumor [¹⁸F]FDG uptake from baseline to follow-up. The plot is for the percentage changes of SUL_peak for all reads. Each dot represents a case (30 cases in total). The x-axis represents the average mean percentage change measurement by all readers. The y-axis represents the average difference between the 12 readers and the reference reader (read_reference). The solid line represents the average bias, and the dashed lines represent the corresponding bias ± 2 standard deviations (SD)