Fig. 3

Correlation analysis map: (A) inter-group analysis of factors associated with dose deviation of PTV; (B) intra-group between factors related to dose deviation and radiomic features of PTV. The correlation coefficient matrix values range from − 1 to 1, representing a perfectly negative and positive correlation, respectively. The values close to 0, the smaller the correlation. The color, value, and circle size in the figure indicate the value of the correlation coefficient. “*” is used as the Wilcoxon-test significance label, < 0.05 is indicated by “*”, < 0.01 is indicated by “**”, and < 0.001 is indicated by “***”. And “ × ” indicates that the result did not pass the significance test. “-G” = global gamma, “-L” = Local gamma, der-V(PTV) = PTV volume deviation between pCT and planned CT, Lesions = number of lesions, Fractions = number of fractions, Type = planning MRI sequence (T1W or T1W-CE)