151. Ultralong TE In Vivo1H MR Spectroscopy of Omega‐3 Fatty Acids in Subcutaneous Adipose Tissue at 7 T
- Author
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Petr Šedivý, Patrik Krumpolec, Martin Krššák, Antonin Skoch, Siegfried Trattnig, Sabina Baumgartner-Parzer, Bianca K. Itariu, Lukas Hingerl, Martin Gajdošík, Angelika Freudenthaler, Barbara Ukropcova, Jozef Ukropec, Milan Hájek, Michael Krebs, and Bernhard Maier
- Subjects
In vivo magnetic resonance spectroscopy ,education.field_of_study ,Chemistry ,Population ,Adipose tissue ,Omega ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Nuclear magnetic resonance ,In vivo ,T2 relaxation ,Radiology, Nuclear Medicine and imaging ,Gas chromatography ,Subcutaneous adipose tissue ,education - Abstract
Background Omega-3 (n-3) fatty acids (FA) play and important role in neural development and other metabolic diseases such as obesity and diabetes. The knowledge about the in vivo content and distribution of n-3 FA in human body tissues is not well established and the standard quantification of FA is invasive and costly. Purpose To detect omega-3 (n-3 CH3 ) and non-omega-3 (CH3 ) methyl group resonance lines with echo times up to 1200 msec, in oils, for the assessment of n-3 FA content, and the n-3 FA fraction in adipose tissue in vivo. Study type Prospective technical development. Population Three oils with different n-3 FA content and 24 healthy subjects. Field strength/sequence Single-voxel MR spectroscopy (SVS) with a point-resolved spectroscopy (PRESS) sequence with an echo time (TE) of 1000 msec at 7 T. Assessment Knowledge about the J-coupling evolution of both CH3 resonances was used for the optimal detection of the n-3 CH3 resonance line at a TE of 1000 msec. The accuracy of the method in oils and in vivo was validated from a biopsy sample with gas chromatography analysis. Statistical tests SVS data were compared to gas chromatography with the Pearson correlation coefficient. Results T2 relaxation times in oils were assessed as follows: CH2 , 65 ± 22 msec; CH3 , 325 ± 7 msec; and n-3 CH3 , 628 ± 34 msec. The n-3 FA fractions from oil phantom experiments (n = 3) were in agreement with chromatography analysis and the comparison of in vivo obtained data with the results of chromatography analysis (n = 5) yielded a significant correlation (P = 0.029). Data conclusion PRESS with ultralong-TE can detect and quantify the n-3 CH3 signal in vivo at 7 T. Level of evidence 1 Technical Efficacy: Stage 1 J. Magn. Reson. Imaging 2019;50:71-82.
- Published
- 2018