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Comparison of localized proton NMR signals of skeletal muscle and fat tissue in vivo : Two lipid compartments in muscle tissue
Author(s) -
Schick Fritz,
Eismann Beate,
Jung WulfIngo,
Bongers Hilmar,
Bunse Michael,
Lutz Otto
Publication year - 1993
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910290203
Subject(s) - nuclear magnetic resonance , compartment (ship) , muscle tissue , skeletal muscle , in vivo , chemistry , relaxation (psychology) , anatomy , biology , physics , oceanography , microbiology and biotechnology , neuroscience , geology
In vivo 1 H NMR spectra of small volumes‐of‐interest (VOI) were localized in human soleus muscle (8 ml) and compared with volume selective spectra of subcutaneous fat tissue and femoral yellow bone marrow (2 ml). All examinations were performed by the double spin echo (PRESS) localization technique. To provide comparability, spectra of different tissues were recorded using identical sequence timing. Clearly improved resolution of the lipid signals of muscle tissue was obtained using long echo times TE > 200 ms. The spectra of muscle tissue exhibit lipid signals that stem from two compartments with a difference of their resonance frequencies of about 0.2 ppm (Larmor frequency difference 12‐13 Hz at 1.5 T). The existence of two fatty acid compartments is supported by measurements of the relaxation times and line shape analysis. Both compartments contain fatty acids or triglycerides with similar composition. Probably one compartment corresponds to fat cells within muscle tissue, the other compartment with lower Larmor frequency is located within muscle cells.