The aims for which PET/CT is frequently used in oncology can be listed as follows.
 Benign/malignant distinction of lesions
 Primary focus investigation in patients with metastasis or paraneoplastic syndrome
 Staging and evaluation of treatment response in c
 During post-treatment follow-ups, discrimination of lesions observed in other imaging modalities in terms of residual tumor or fibrosis
 Investigation of recurrence in patients with elevated tumor markers
 Determining the area to be biopsied in tumors
 Guidance on radiotherapy (RT) planning
It is known that PET provides significant benefits in oncological patient management, especially with treatment response evaluation. Indications for the use of F-18 FDG PET / CT (Positron emission tomography / Computed Tomography) in oncology are increasing day by day. In this section, the most common oncological F-18 FDG PET applications in nuclear medicine clinics will be discussed.