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- Title
Measurement of N-acetylaspartylglutamate in the human frontal brain by <sup>1</sup>H-MRS at 7 T.
- Authors
Choi, Changho; Ghose, Subroto; Uh, Jinsoo; Patel, Aditya; Dimitrov, Ivan E.; Lu, Hanzhang; Douglas, Deborah; Ganji, Sandeep
- Abstract
N-Acetylaspartylglutamate in human brain has been measured with difference editing at 7 T. The CH2 proton resonances (∼2.5 ppm) of the aspartyl groups of N-acetylaspartylglutamate and N-acetylaspartate were difference edited (MEGA) using 20-msec gaussian radiofrequency pulses for selective 180° rotations of the coupling partners at 4.61 and 4.38 ppm, respectively. The echo time of the editing sequence, 108 msec, was obtained in phantom tests. Single-voxel localized in vivo measurements were conducted in the medial prefrontal and right frontal cortices of five healthy volunteers. The gray and white matter fractions within the voxels were obtained from T1-weighted image segmentation. Using linear regression of the metabolite concentration vs. fractional white matter contents within the voxels, the N-acetylaspartylglutamate-to- N-acetylaspartate concentration ratios in gray and white matter were estimated to be 0.13 and 0.28 by difference editing (95% confidence intervals 0.07-0.19 and 0.22-0.34), respectively, assuming identical relaxation effects between the metabolites. Magn Reson Med, 2010. © 2010 Wiley-Liss, Inc.
- Publication
Magnetic Resonance in Medicine, 2010, Vol 64, Issue 5, p1247
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.22536