Abstract
Objective
Measuring the pure form of GABA has become increasingly important because of its association with behaviour and certain pathologies. The aim of this study was to assess the reproducibility of GABA measurements using a shim and motion navigated MEGA-SPECIAL sequence with LCModel, jMRUI and GANNET software.
Materials and methods
Motion and shim navigated MEGA-SPECIAL scans were acquired in 20 healthy subjects. Two acquisitions were performed for each of two regions: the anterior cingulate (ACC) and medial-parietal (PAR) cortices. Absolute GABA concentration (\({\text{GABA}}_{{{\text{H}}_{2} {\text{O}}}}\)) and GABA-to-Creatine ratio (GABA/Cr) were quantified using the three software packages.
Results
Using the within-subject coefficient of variation (CVws) as an index, reproducibility for both GABAH20 and GABA/Cr ranged from 13 to 22 % in the ACC and 13 to 18 % in PAR using the three software packages.
Conclusion
Based on CVws, GABA concentrations in both the ACC and PAR are reproducible using a shim and motion navigated MEGA-SPECIAL sequence with any of the three software packages, thus demonstrating the ability to quantify the pure form of GABA using these software in studies relating GABA to pathology and healthy behaviour.
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Acknowledgments
Support was provided by the South African Research Chairs Initiative of the National Research Foundation and Department of Science and Technology (NRF-DST), National Institutes of Health (NIH) Grant R01HD071664 and the South African Medical Research Council (MRC).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
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Saleh, M.G., Near, J., Alhamud, A. et al. Reproducibility of macromolecule suppressed GABA measurement using motion and shim navigated MEGA-SPECIAL with LCModel, jMRUI and GANNET. Magn Reson Mater Phy 29, 863–874 (2016). https://doi.org/10.1007/s10334-016-0578-8
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DOI: https://doi.org/10.1007/s10334-016-0578-8