Identification of brown adipose tissue in mice with fat–water IDEAL‐MRI
Year: 2010
Type: article
Abstract: PURPOSE: To investigate the feasibility of using IDEAL (Iterative Decomposition with Echo Asymmetry and Least squares estimation) fat-water imaging and the resultant fat fraction metric in detecting brown adipose tissue (BAT) in mice, and in differentiating BAT from white adipose tissue (WAT). MATERIALS AND METHODS: Excised WAT and BAT samples and whole-mice carcasses were imaged with a rapid three-dimensional fat-water IDEAL-SPGR sequence on a 3 Tesla scanner using a single-channel wrist coil. An isotropic voxel size of 0.6 mm was used. Excised samples were also scanned with single-voxel proton spectroscopy. Fat fraction images from IDEAL were reconstructed online using research software, and regions of WAT and BAT were quantified. RESULTS: A broad fat fraction range for BAT was observed (40-80%), in comparison to a tighter and higher WAT range of 90-93%, in both excised tissue samples and in situ. Using the fat fraction metric, the interscapular BAT depot in each carcass could be clearly identified, as well as peri-renal and inguinal depots that exhibited a mixed BAT and WAT phenotype appearance. CONCLUSION: Due to BAT's multi-locular fat distribution and extensive mitochondrial, cytoplasm, and vascular supply, its fat content is significantly less than that of WAT. We have demonstrated that the fat fraction metric from IDEAL-MRI is a sensitive and quantitative approach to noninvasively characterize BAT.
DOI: 10.1002/jmri.22162
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: green
Awards: G1564332613, USC Center for Transdisciplinary Research on Energetics*, G283777812, G3222680223, G3300144855, UAB Diabetes Research and Training Center, EXPANDING THE APPLICATION OF MRI FOR BODY FAT STUDIES IN HUMANS, G860149444, G864137628, UAB Obesity Training Program, UAB Nutrition Obesity Research Center (NORC)
OpenAlex ID: W2169816528