Fig. 2

VOI was delineated and feature extraction: a and b represent those two patients and outline the volume process of interest. The yellow line represents the tumor boundary, the red line represents the physical expansion of 5 mm to the peritumor, the blue line represents the expansion of 10 mm, and the green line represents the expansion of 15 mm. In this study, 5-mm and 10-mm peritumor areas are discussed. b shows that peritumoral expansion terminates when it reaches the edge of the liver