Hybrid PET/MRI as a tool to detect brown adipose tissue: Proof of principle. Issue 6 (November 2015)

• Record Type: Journal Article
• Authors: Gariani, Karim; Gariani, Joanna; Amzalag, Gaël; Delattre, Bénédicte M.A.; Ratib, Osman; Garibotto, Valentina
• Is Part Of: Obesity research & clinical practice. Volume 9:Issue 6(2015:Nov./Dec.)
• Page Start: 613
• Page End: 617
• Publication Date: 2015-11
• Subjects: Brown adipose tissue -- Obesity -- Positron emission tomography -- Magnetic resonance imaging; Obesity -- Research -- Periodicals; Obesity -- Treatment -- Periodicals; Obesity -- Periodicals; Obésité -- Recherche -- Périodiques; Obésité -- Traitement -- Périodiques; Obesity -- Research; Obesity -- Treatment; Electronic journals; Periodicals; 616.398
• DOI: 10.1016/j.orcp.2015.05.004
• Languages: English
• ISSNs: 1871-403X

Abstract

Summary: Objective: The purpose of this study was to assess the performance of 18 F-FDG hybrid PET/MRI to detect and localise the presence of metabolically active brown adipose tissue (BAT). Methods: We retrospectively analyzed 197 consecutive 18 F-flurodeoxyglucose ( 18 F-FDG) positron-emission tomographic (PET) and magnetic resonance imaging (MRI) images performed with a hybrid whole-body PET–MRI tomography in 192 patients. These patients were originally investigated mainly for oncological staging, in the absence of a cooling protocol. The presence of BAT was defined as a soft tissue structure that was larger than 4 mm in diameter, had the characteristics of fat tissue on MRI and had a maximal standardised uptake value (SUV) of 18 F-FDG of at least 2.0. No specific MRI sequences for BAT detection were acquired. Results: PET/MRI identified the presence of metabolically active BAT in 5 out of 192 patients (2.6%). BAT positive subjects were all female, significantly younger and with significantly lower body weight than BAT negative subjects. Conclusions: Whole body hybrid PET/MRI allowed for the identification of BAT, with a low prevalence, comparable to previous retrospective PET/CT studies realised in the absence of a cooling protocol. The main advantages of the PET/MRI hybrid technique, as compared with PET/CT, includes a lower radiation burden, and the possibility to combine a multiparameter fat characterization by dedicated MRI sequences. Hybrid PET/MRI might represent the ideal tool for BAT evaluation.