Conférence CRCHUS | Resonance Imaging of Brown Adipose Tissue

2017-09-12

E. Brian Welch, Ph.D., M.B.A.

Assistant Professor

Department of Radiology and Radiological Sciences

Department of Biomedical Engineering

Vanderbilt University Institute of Imaging Science (VUIIS)

Vanderbilt University Medical Center, Nashville, TN

Catégorie | Conférence CRCHUS

Conférencier | E. Brian Welch, Ph.D., M.B.A.

Axe | Diabète, obésité et complications cardiovasculaires

Date | Mardi 12 septembre 2017 à 12 h

Lieu | local 2999

 

Résumé

Conférence en anglais seulement

Brown adipose tissue (BAT) is a thermogenic tissue known to be present in many small mammals and human infants. In human subjects, BAT is believed to diminish with age and be essentially undetectable in adults. However, recent 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET) studies show that small but metabolically significant amounts of BAT persist into adulthood. These studies further suggest an inverse relationship between BAT and obesity, although it remains unclear whether reduced BAT amount and/or activity promotes or results from obesity. The most commonly employed imaging method for differentiating BAT and white adipose tissue (WAT) uses a combination of 18F-FDG PET and x-ray computed tomography (CT), which requires an undesirable radiation dose. An alternative to PET-CT is magnetic resonance imaging (MRI). MRI does not use ionizing radiation and is well suited for longitudinal studies and investigations of radiation-sensitive subjects such as children. Multiple MRI methods can detect and characterize human BAT. Example MRI methods for BAT detection include quantitative fat-signal fraction mapping, fat-water separated thermometry, T2 mapping, dynamic T2*-weighted imaging, hyperpolarized xenon imaging, dynamic contrast enhanced imaging, and perfusion/diffusion imaging. This talk presents an overview of the various MRI methods for imaging BAT with a special focus on quantitative fat-fraction mapping.

Partagez cet article