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Fig. 3D —46-year-old man with adenocarcinoma in right lower lobe and metastasis in right paratracheal lymph node, which was predicted by integrated PET/CT but not by helical dynamic CT. Attenuation measurements of helical dynamic CT through nodule indicate probable absence of mediastinal nodal metastasis with unenhanced nodule attenuation of 40 H and peak enhancement of 77 H, thus net enhancement 37 H. PRE = unenhanced nodule attenuation, PEAK = peak enhancement nodule attenuation.