Figure 1.

The workflow of the essential procedures. Original tumors are outlined on each axial portal venous phase CT slice. Amount of radiomics features were extracted from the region outline automatically to digitize tumor shape, intensity, and texture. Two essential steps were employed for feature selection. The radiomics model was established through a linear combination of selected features. The ROC and calibration curves were used to evaluate the efficiency of the radiomic model. Finally, the nomogram was constructed for individualized evaluation of clinical use.