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Fig. 1F —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 (short arrows) and left atrium (long arrows) show visual quality of PET image is not compromised when IV contrast CT is used for attenuation correction. However, mean (maximum) ROI values of subclavian vein and left atrium increased to 1,962 (3,070) and 260 (283) on contrast-enhanced CT images compared with A–C, respectively. Corresponding PET SUV values were 1.3 (1.6) and 2.45 (3.0), an increase in SUV_max of 60% and 43%, respectively. F, Coregistered PET/CT.