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

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 2018.

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