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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 CH 3 ) and non‐omega‐3 (CH 3 ) 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 CH 3  resonances was used for the optimal detection of the n‐3 CH 3  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  T 2  relaxation times in oils were assessed as follows: CH 2 , 65 ± 22 msec; CH 3 , 325 ± 7 msec; and n‐3 CH 3 , 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 CH 3  signal in vivo at 7 T.   Level of Evidence:  1   Technical Efficacy:  Stage 1  J. Magn. Reson. Imaging 2019;50:71–82.

Ultralong TE In Vivo 1 H MR Spectroscopy of Omega‐3 Fatty Acids in Subcutaneous Adipose Tissue at 7 T