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Figure 2a.  Normal distribution of FDG. Anterior reprojection attenuation-corrected FDG PET images of the chest and upper abdomen in patients who had fasted show minimal (a) and intense (b) myocardial FDG uptake. With attenuation correction, lung tracer activity is nearly absent and low-level tracer activity is present in the mediastinum and heart cavity due to the blood pool. Low-level hepatic and renal activity is also present. Arrowheads indicate abnormal FDG uptake in small bronchogenic carcinomas.