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FDG uptake in the morphologically normal thymus: comparison of FDG positron emission tomography andCT

T Nakahara, MD1,2, H Fujii, MD1,2, M Ide, MD1, N Nishiumi, MD1, W Takahashi, MD1, S Yasuda, MD1, A Shohtsu, MD1 and A Kubo, MD2

1HIMEDIC Imaging Center at Lake Yamanaka, Yamanashi and 2Department of Radiology, School of Medicine, Keio University, Tokyo, Japan



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  		Figure 1. (a) CT and (b) transaxial fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET) images at the level of the superior mediastinum in a subject with positive PET findings. (a) The thymus appears to be morphologically normal (arrows). (b) Wedge-shaped FDG uptake is noted (arrows).

 


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  		Figure 2. Scatterplot of CT attenuation values of the thymus (CAT) against the thymus to lung ratio (T/L ratio) in fluorine-18 fluorodeoxyglucose positron emission tomography.

 


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  		Figure 3. Comparison of the CT attenuation values of the thymus (CAT) and positron emission tomography (PET) findings.

 




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