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18F-FDG PET/CT of a rectal carcinoma and a sigmoid adenoma
  1. Jan Menke1,
  2. Inga-Marie Schaefer2,
  3. Carsten Oliver Sahlmann3
  1. 1Department of Diagnostic Radiology, University Hospital, Goettingen, Germany
  2. 2Department of Pathology, University Hospital, Goettingen, Germany
  3. 3Department of Nuclear Medicine, University Hospital, Goettingen, Germany
  1. Correspondence to Dr Jan Menke, Department of Diagnostic Radiology, University Hospital, Robert-Koch-Strasse 40, Goettingen 37075, Germany; Menke-J{at}T-Online.de

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Introduction

Positron-emission tomography (PET) with intravenously injected 18F-fluorodeoxyglucose (18F-FDG) provides ‘functional’ images of cellular glucose metabolism (FDG-PET). Integrated CT provides additional ‘anatomical’ images of the body’s X-ray attenuation (FDG-PET/CT).1 For diagnosis, FDG-avid foci are visually identified on the PET images, their 18F-FDG uptake can be semiquantitatively measured for instance by the maximum standardised uptake value (SUVmax), and the foci are matched to anatomical structures using the coregistered CT images.1 Some 18F-FDG is also excreted by the urinary tract, which must be considered. FDG-PET/CT is predominately used for whole-body tumour staging, but has further indications such as searching infectious foci. In the following, specific properties of …

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