Fig. 2From: Respiratory-gated (4D) contrast-enhanced FDG PET-CT for radiotherapy planning of lower oesophageal carcinoma: feasibility and impact on planning target volumeA comparison of PTV contours derived using i) 4D CT data, ii) 4D CT co-registered to 3D PET-CT and iii) 4D CT and 4D PETBack to article page