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. 2019 May 31;104(10):4865–4878. doi: 10.1210/jc.2019-00728

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Figure 6. — BAT activity measurement by ¹⁸F-FDG PET/CT. (a) BAT activity is greater in lean subjects (black, n = 12) than subjects with obesity (red, n = 9). (b–d) BAT activity is not correlated with (b) capacity of CIT, (c) coldest tolerable temperature, or (d) insulation. (e) Examples of PET/CT scans demonstrating variable ¹⁸F-FDG uptake by BAT and skeletal muscle in lean subjects (1–3) and subjects with obesity (4 and 5). In subject 1, note the lack of BAT ¹⁸F-FDG uptake despite ¹⁸F-FDG signal in muscle, indicative of shivering.