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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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