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  4. Proton T(1) relaxation times of metabolites in human occipital white and gray matter at 7 T
 
research article

Proton T(1) relaxation times of metabolites in human occipital white and gray matter at 7 T

Xin, Lijing  
•
Schaller, Benoît  
•
Mlynarik, Vladimir  
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2013
Magnetic Resonance in Medicine

Proton T(1) relaxation times of metabolites in the human brain have not previously been published at 7 T. In this study, T(1) values of CH(3) and CH(2) group of N-acetylaspartate and total creatine as well as nine other brain metabolites were measured in occipital white matter and gray matter at 7 T using an inversion-recovery technique combined with a newly implemented semi-adiabatic spin-echo full-intensity acquired localized spectroscopy sequence (echo time = 12 ms). The mean T(1) values of metabolites in occipital white matter and gray matter ranged from 0.9 to 2.2 s. Among them, the T(1) of glutathione, scyllo-inositol, taurine, phosphorylethanolamine, and N-acetylaspartylglutamate were determined for the first time in the human brain. Significant differences in T(1) between white matter and gray matter were found for water (-28%), total choline (-14%), N-acetylaspartylglutamate (-29%), N-acetylaspartate (+4%), and glutamate (+8%). An increasing trend in T(1) was observed when compared with previously reported values of N-acetylaspartate (CH(3) ), total creatine (CH(3) ), and total choline at 3 T. However, for N-acetylaspartate (CH(3) ), total creatine, and total choline, no substantial differences compared to previously reported values at 9.4 T were discernible. The T(1) values reported here will be useful for the quantification of metabolites and signal-to-noise optimization in human brain at 7 T. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.

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Type
research article
DOI
10.1002/mrm.24352
Web of Science ID

WOS:000316629300004

Author(s)
Xin, Lijing  
Schaller, Benoît  
Mlynarik, Vladimir  
Lu, Huanxiang
Gruetter, Rolf  
Date Issued

2013

Publisher

Wiley-Blackwell

Published in
Magnetic Resonance in Medicine
Volume

69

Issue

4

Start page

931

End page

936

Subjects

CIBM-AIT

•

T-1 relaxation time

•

human brain

•

metabolites

•

occipital lobe

•

white matter

•

gray matter

•

7 T

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CIBM  
LIFMET  
Available on Infoscience
December 18, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/87473
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