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Celal Bayar Üniversitesi, Nükleer Tıp Anabilim Dalı, Manisa F-18 FDG PET/CT are being used in increasing numbers in the diagnosis of the primary lesion, disease staging and evaluation of response to therapy of various cancers due to its high accuracy. However, PET/CT have various artifacts which affected image quality including PET and CT AC (attenuation correction) artifacts. For accurate identification of malignant lesions, to characterize these artifacts is clinically important. Our aim is to identify, to characterize and to investigate the effect of PET/CT image quality of these artifacts. Keywords : Artifact; PET/CT