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Fig. 1D —67-year-old man with adenocarcinoma in left upper lobe and metastases in left lower paratracheal and aortopulmonary window nodes, which were predicted by both helical dynamic CT and integrated PET/CT. Attenuation measurements of helical dynamic CT through nodule indicate probable mediastinal nodal metastasis with unenhanced nodule attenuation of 71 H (C) and peak enhancement of 120 H (D), thus net enhancement of 49 H. PRE = unenhanced nodule attenuation, PEAK = peak enhancement nodule attenuation.