Fig. 1.

¹⁸F-FDG PET/CT images in an example patient with NSCLC. Maximum intensity projection (MIP) image (a) and axial fused image (b) show the FDG-avid lesion in lung right lower lobe (arrowhead) with SUV-T 2.8, which was adenocarcinoma. Mild FDG uptake is seen in the left upper paratracheal lymph node (arrows a c) with SUV-LN 2.4 and SUV-R 0.86, which was confirmed as metastatic. This shows the ability of SUV-R to differentiate between benign and malignant lymph nodes in patients with low SUV-T, while SUV-LN was false-negative. The FDG-avid subcarinal and right hilar lymph nodes (open arrows a, d) with SUV-LN 5.6 and SUV-R 2.0 were also confirmed as metastatic