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Fig. 2F —50-year-old woman with adenocarcinoma in right lower lobe and metastases in right lower paratracheal and subcarinal nodes, which were predicted by helical dynamic CT but not by integrated PET/CT. Attenuation measurements of helical dynamic CT through nodule indicate probable mediastinal nodal metastasis with unenhanced nodule attenuation of 30 H and peak enhancement of 119 H, thus net enhancement of 89 H. PRE = unenhanced nodule attenuation, PEAK = peak enhancement nodule attenuation.