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1 H MRS of intramyocellular lipids in soleus muscle at 7 T: Spectral simplification by using long echo times without water suppression
Author(s) -
Ren Jimin,
Sherry A. Dean,
Malloy Craig R.
Publication year - 2010
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.22345
Subject(s) - chemistry , soleus muscle , nuclear magnetic resonance , spectroscopy , voxel , nuclear magnetic resonance spectroscopy , in vivo magnetic resonance spectroscopy , analytical chemistry (journal) , skeletal muscle , medicine , chromatography , magnetic resonance imaging , stereochemistry , physics , quantum mechanics , radiology
The popular short echo time 1 H MR spectroscopy acquisition method for detection of intramyocellular lipids suffers from spectral overlap due to the large, broad, and asymmetric extramyocellular lipid signals, the time‐consuming practice of selecting “lean” voxels for spectroscopy, and the overlap of the extramyocellular lipid signal with the creatine methyl 1 H signal at ∼3 parts per million (ppm), commonly used as an internal standard. Using an alternative acquisition strategy, spectra with well‐resolved intramyocellular lipids resonances were acquired from large volumes (10 to 15 mL) of human soleus muscle in less than 5 min by single‐voxel 7‐T 1 H MR spectroscopy, using an echo time of 280 ms. From the high‐resolution spectra, an average intramyocellular lipid concentration of 7.7 ± 3.5 mmol/kg muscle was found for 25 healthy subjects (male/female 17/8; age 29.4 ± 6.6 years). Since water suppression was not required, the 1 H signals from unsaturated intracellular triglycerides at about 5.3 ppm were easily detected, which, in combination with the well‐determined (CH 2 ) n /CH 3 intensity ratio at long echo time, enabled assessment of the composition of triglycerides in the intramyocellular lipids compartment. Long‐echo single‐voxel spectroscopy at 7 T offers rapid and convenient acquisition of high‐resolution spectra from human soleus muscle. Magn Reson Med, 2010. © 2010 Wiley‐Liss, Inc.