Identification and characterization of human brown adipose tissue (BAT) content and metabolism in adults using [18F]-FDG PET/MR – a pilot study
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KeywordsBrown Adipose Tissue White Adipose Tissue Water Suppression Water Percentage Calculated Water
Brown adipose tissue (BAT) is present in human adults and when present visualised with [18F]-FDG PET. It contains large amounts of mitochondriae, which gives a higher water content compared to white adipose tissue and a high FDG avidity when activated .
Five adults underwent PET/MR. BAT was cold-activated using a water-perfused vest, with injection of 100Mbq FDG after 60 minutes . Hereafter cervical regions were scanned on an Siemens Biograph mMR 3T. PET was performed as single bed 10 minutes acquisition.
MRI included DIXON sequence for attenuation correction and axial T2 weighted sequences with and without water suppression, the latter for calculation of water percentage (W%).
No significant correlation was found between water percentage in fat tissue with or without BAT, maybe because the two modalities measures different physiological properties. Accordingly, BAT can be present but not activated and therefore measurements with both modalities seems necessary for fully characterization of BAT.
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