MR properties of brown and white adipose tissues
G Hamilton, DL Smith Jr, M Bydder… - Journal of Magnetic …, 2011 - Wiley Online Library
Journal of Magnetic Resonance Imaging, 2011•Wiley Online Library
Purpose: To explore the MR signatures of brown adipose tissue (BAT) compared with white
adipose tissue (WAT) using single‐voxel MR spectroscopy. Materials and Methods: 1H MR
STEAM spectra were acquired from a 3 Tesla clinical whole body scanner from seven
excised murine adipose tissue samples of BAT (n= 4) and WAT (n= 3). Spectra were
acquired at multiple echo times (TEs) and inversion times (TIs) to measure the T1, T2, and
T2‐corrected peak areas. A theoretical triglyceride model characterized the fat in terms of …
adipose tissue (WAT) using single‐voxel MR spectroscopy. Materials and Methods: 1H MR
STEAM spectra were acquired from a 3 Tesla clinical whole body scanner from seven
excised murine adipose tissue samples of BAT (n= 4) and WAT (n= 3). Spectra were
acquired at multiple echo times (TEs) and inversion times (TIs) to measure the T1, T2, and
T2‐corrected peak areas. A theoretical triglyceride model characterized the fat in terms of …
Purpose
To explore the MR signatures of brown adipose tissue (BAT) compared with white adipose tissue (WAT) using single‐voxel MR spectroscopy.
Materials and Methods
1H MR STEAM spectra were acquired from a 3 Tesla clinical whole body scanner from seven excised murine adipose tissue samples of BAT (n = 4) and WAT (n = 3). Spectra were acquired at multiple echo times (TEs) and inversion times (TIs) to measure the T1, T2, and T2‐corrected peak areas. A theoretical triglyceride model characterized the fat in terms of number of double bonds (ndb) and number of methylene‐interrupted double bonds (nmidb).
Results
Negligible differences between WAT and BAT were seen in the T1 and T2 of fat and the T2 of water. However, the water fraction in BAT was higher (48.5%) compared with WAT (7.1%) and the T1 of water was lower in BAT (618 ms) compared with WAT (1053 ms). The fat spectrum also differed, indicating lower levels of unsaturated triglycerides in BAT (ndb = 2.7, nmidb = 0.7) compared with WAT (ndb = 3.3, nmidb = 1.0).
Conclusion
We have demonstrated that there are several key MR‐based signatures of BAT and WAT that may allow differentiation on MR imaging. J. Magn. Reson. Imaging 2011;. © 2011 Wiley‐Liss, Inc.
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