Objective. We retrospectively analyzed activated BAT visualization on FDG-PET/CT in patients with various conditions and TH\nlevels to clarify the relationships between visualization of BAT on FDG-PET/CT and the effect of TH. Methods. Patients who\nunderwent clinical FDG-PET/CTwere reviewed andwe categorized patients into 5 groups: (i) thyroid hormone withdrawal (THW)\ngroup; (ii) recombinant human thyrotropin (rhTSH) group; (iii) hypothyroidism group; (iv) hyperthyroidism group; and (v) BAT\ngroup. A total of sixty-two FDG-PET/CT imaging studies in fifty-nine patients were performed. To compare each group, gender;\nage; body weight; serum TSH, FT3, and FT4 levels; and outside temperature were evaluated. Results. No significant visualization\nof BAT was noted in any of the images in the THW, rhTSH, hypothyroidism, and hyperthyroidism groups. All patients in the BAT\ngroup were in a euthyroid state. When the BAT-negative and BAT-positive patient groups were compared, it was noted that the\nminimum andmaximum temperature on the day of the PET study and maximum temperature of the one day before the PET study\nwere significantly lower in BAT-positive group than in all those of other groups. Conclusions. Elevated TSH condition before RIT,\nhyperthyroidism, or hypothyroidism did not significantly impact BAT visualization of clinical FDG-PET/CT images.
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