- Value of F-FDG PET / CT in changing treatment strategies Table 3.8: Changing treatment strategies Purpose post 18F-FDG PET / CT Reason n% Palliative Distant metastasis 3 3.3 Airway invasion 3 3.3 Abdominal lymph node 1 1.1 Synchronous cancer 2 2.2 Curative Exclusion of lung metastases 1 1.1 Total 10 11.0 18F-FDG PET / CT changed the treatment strategy in 10 patients (11.0%).