Influence of foot orientation on the appearance and quantification of 1H magnetic resonance muscle spectra obtained from the soleus and the vastus lateralis

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Abstract

Muscle 1H magnetic resonance spectroscopy noninvasively measures intramyocellular lipid levels, which correlate with obesity, insulin resistance, and type 2 diabetes. The appearance of muscle magnetic resonance spectra is influenced by bulk magnetic susceptibility and residual dipolar couplings which depend on the angle between the muscle fibers and the main magnetic field. This study used a 4 T magnet to examine the influence of foot orientation on the appearance and quantification of muscle magnetic resonance spectra from the soleus and the vastus lateralis. For each individual, intramyocellular lipid, extramyocellular lipid, and creatine concentrations were quantified in the soleus and the vastus lateralis during one session. Foot orientation was found to influence the appearance of muscle spectra from the soleus but not from the vastus lateralis. It was concluded that quantifying intramyocellular lipid by the standard LCModel using a water reference may be more appropriate than using a creatine reference in the presence of residual dipolar couplings.

Original languageEnglish (US)
Pages (from-to)1731-1737
Number of pages7
JournalMagnetic resonance in medicine
Volume68
Issue number6
DOIs
StatePublished - Dec 2012

Keywords

  • LCModel
  • carnosine
  • creatine
  • intramyocellular lipids

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