Figure 2From: Feasibility and potential benefits of defining the internal gross tumor volume of hepatocellular carcinoma using contrast-enhanced 4D CT images obtained by deformable registrationDR improves the determination of GTV contours obtained from 4D CT images (on axial view). A. CT00 respiratory phase of 4D CT image. B. CT50 respiratory phase of 4D CT images. Yellow contours: GTVs before DR; red contours: GTVs after DR.Back to article page