Application of positron emission tomography/computed tomography in radiation treatment planning for head and neck cancers

Figure 1 Positron emission tomography/computed tomography improves gross tumor and nodal volume delineation in a patient with oral tongue cancer. A: In the CT image, the tumor is difficult to separate from the soft tissues of the tongue; B: In the PET image, there is sharp demarcation of the primary tumor; C: The GTV is outlined in red based on CT scan; D: The GTV outlined in red based on ¹⁸FDG PET/CT is much smaller. ¹⁸FDG-PET/CT: 18-fluorodeoxygluocose positron emission tomography/computed tomography; GTV: Gross tumor and nodal volume.