Two-site reproducibility of cerebellar and brainstem neurochemical profiles with short-echo, single-voxel MRS at 3T

Dinesh K. Deelchand, Isaac M. Adanyeguh, Uzay E. Emir, Tra My Nguyen, Romain Valabregue, Pierre Gilles Henry, Fanny Mochel, Gülin Öz

Research output: Contribution to journalArticlepeer-review

71 Scopus citations


Purpose To determine whether neurochemical concentrations obtained at two MRI sites using clinical 3T scanners can be pooled when a highly optimized, nonvendor short-echo, single-voxel proton MRS pulse sequence is used in conjunction with identical calibration and quantification procedures. Methods A modified semi-LASER sequence (TE = 28 ms) was used to acquire spectra from two brain regions (cerebellar vermis and pons) on two Siemens 3T scanners using the same B0 and B1 calibration protocols from two different cohorts of healthy volunteers (N = 24-33 per site) matched for age and body mass index. Spectra were quantified with LCModel using water scaling. Results The spectral quality was very consistent between the two sites and allowed reliable quantification of at least 13 metabolites in the vermis and pons compared with 3-5 metabolites in prior multisite magnetic resonance spectroscopy trials using vendor-provided sequences. The neurochemical profiles were nearly identical at the two sites and showed the feasibility to detect interindividual differences in the healthy brain. Conclusion Highly reproducible neurochemical profiles can be obtained on different clinical 3T scanners at different sites, provided that the same, optimized acquisition and analysis techniques are used. This will allow pooling of multisite data in clinical studies, which is particularly critical for rare neurological diseases. Magn Reson Med 73:1718-1725, 2015.

Original languageEnglish (US)
Pages (from-to)1718-1725
Number of pages8
JournalMagnetic resonance in medicine
Issue number5
StatePublished - May 1 2015

Bibliographical note

Publisher Copyright:
© 2014 Wiley Periodicals, Inc.


  • 3 Tesla
  • multi-site
  • reproducibility
  • spectroscopy


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