Fig. 2

Basic procedures for the study. (1) Screen patients suitable for this study from all OS and CS patients in our hospital and obtain CET1 and T2WI-FS sequence data; (2) experienced radiologist outlines the tumor on CET1 and T2WI-FSMR images; (3) extract 530 initial radiomics features from the tumor area delineated by the original MR image; (4) select radiomics features by least absolute shrinkage and selection operator (LASSO) logistic regression; (5) use ROC analysis to evaluate the established radiomics model.