Figure 1From: Feasibility and potential benefits of defining the internal gross tumor volume of hepatocellular carcinoma using contrast-enhanced 4D CT images obtained by deformable registrationGTV contours obtained from 3D or 4D CT scans before DR (on axial view). A. contrast-enhanced 3D CT image. B. non-contrast-enhanced 3D CT image. C. CT00 respiratory phase of 4D CT images. D. CT50 respiratory phase of 4D CT images. Yellow contours: GTVs before DR.Back to article page