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. Author manuscript; available in PMC: 2020 May 11.
Published in final edited form as: Neuroimage. 2018 Sep 19;184:475–489. doi: 10.1016/j.neuroimage.2018.09.039

Fig. 8.

Fig. 8

Linear regression plot of GABA/tNAA and Glx/tNAA versus gray matter tissue composition. tNAA obtained from EDIT-OFF IR-ON spectra was used as normalization in all cases. Linear regression equation, as well as r-value and p-values are provided. GABA/tNAA shows a signal decrease by a factor of ~4 in the case of IR-ON compared to IR-OFF (IR reduces the GABA signal by a factor of ~2 and eliminates MM contributions), while a factor of only ~1.7 in signal decrease is observed in the case of Glx/tNAA.