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Hi, I wonder if someone can help me to do something similar to that: " the mean intensity of each FreeSurfer region (ROI) for the 45 subcortical and the 68 cortical regions were assessed the mean intensity of each FreeSurfer region (ROI) for the 45 subcortical and the 68 cortical regions were assessed to obtain SVU". Also, I found an article that mentioned that " the estimated total intracranial volume (eTIV) is calculated, which is used later for normalization of the volumetric measures". My questions are: 1) In " gtm.stats.dat" not all subcortical regions are mentioned, why? 2) I applied "mri_getmpc" to obtain the mean intensity, however, I could not figure out what I should do after this step to obtain the mean intensity and compute SVU. 3) why do they use eTIV, should I use it, and if yes how! best regards.