Fig. 2From: Multimodality imaging with CT, MR and FDG-PET for radiotherapy target volume delineation in oropharyngeal squamous cell carcinomaRepresentative example of GTVs delineated on CT, MR, CT-MR by a single radiation oncologist, displayed on an axial CT scan, for a patient with a T1 N2b well differentiated squamous cell carcinoma of the right tonsil. CT GTV red; MR GTV yellow; CT-MR contour orange; PET contour blueBack to article page