Fig. 1From: Vascular inflammation and aortic stiffness: potential mechanisms of increased vascular risk in chronic obstructive pulmonary diseaseTypical fused PET/CT image. a Fused FDG PET/CT axial image of the aorta and superior vena cava. b Tissue-to-blood ratio (TBR) calculated by dividing FDG uptake in aorta (green circles) by uptake in the superior vena cava (small green circle)Back to article page