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Fig. 1B —60-year-old man with esophageal cancer and lung metastasis. Attenuation correction performed using unenhanced CT (A–C), (G–I) and IV contrast-enhanced CT (D–F), (J–L). Coronal images at level of subclavian vein and heart. Mean (maximum) region of interest (ROI) values for subclavian vein (short arrows) and left atrium (long arrows) were 36 (49) H and 35 (40) H, respectively, on unenhanced CT scan. Corresponding PET standardized uptake values (SUV) were 0.97 (1.0) and 1.88 (2.1), respectively. B, Attentuation-corrected PET with unenhanced CT.