Figure 1From: FDG-PET/CT imaging for staging and radiotherapy treatment planning of head and neck carcinomaThe diagram shows the volumes identified after fusion of CT and PET images. "PET/CT-GTV" is the composite volume of PET and CT; "PEToutCT" is the volume identified by PET but not by CT; "CToutPET" is the volume identified by CT but not by PET; "CT&PET" is the common volume of PET and CT.Back to article page