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Representative images of CT (A), and matched 18F-FDG PET image (B). Manual placement of a region of interest with a fixed size of approximately 30 mm in diameter in the background lung field of the PET image (solid line) for measurement of SUVmax of the contralateral interstitial lesion. CT, computed tomography; 18F-FDG PET, fluorine-18 2-fluoro-2-deoxy-D-glucose positron emission tomography; SUVmax, maximum standardized uptake value.
