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research article

Methodology of H NMR Spectroscopy of the Human Brain at Very High Magnetic Fields

Tkáč, I.
•
Gruetter, R.  
2005
Applied magnetic resonance

An ultrashort-echo-time stimulated echo-acquisition mode (STEAM) pulse sequence with interleaved outer volume suppression and VAPOR (variable power and optimized relaxation delays) water suppression was redesigned and optimized for human applications at 4 and 7 T, taking into account the specific requirements for spectroscopy at high magnetic fields and limitations of currently available hardware. In combination with automatic shimming, automated parameter adjustments and data processing, this method provided a user-friendly tool for routine (1)H nuclear magnetic resonance (NMR) spectroscopy of the human brain at very high magnetic fields. Effects of first- and second-order shimming, single-scan averaging, frequency and phase corrections, and eddy currents were described. LCModel analysis of an in vivo (1)H NMR spectrum measured from the human brain at 7 T allowed reliable quantification of more than fifteen metabolites noninvasively, illustrating the potential of high-field NMR spectroscopy. Examples of spectroscopic studies performed at 4 and 7 T demonstrated the high reproducibility of acquired spectra quality.

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Type
research article
DOI
10.1007/BF03166960
Author(s)
Tkáč, I.
Gruetter, R.  
Date Issued

2005

Publisher

Springer Verlag

Published in
Applied magnetic resonance
Volume

29

Issue

1

Start page

139

End page

157

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LIFMET  
Available on Infoscience
May 27, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/80933
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