Use mri_concat avg-lh-thickness.15.mgh --std --o avg-lh-thickness.15.std.mgh

You can compute mean with --mean instead of --std

On 1/9/19 9:19 AM, Schranzer René wrote:

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Hello everyone,

I have some problems with the computation of the SD of thickness maps (mgh file) of 10 subjects.

First I computed the average thickness map (to fsaverage) with the command:

mris_preproc --fsgd qdec/subject_list.fsgd --target fsaverage --hemi lh --meas thickness --out avg-lh-thickness.mgh

mri_surf2surf --hemi lh --s fsaverage --sval avg-lh-thickness.mgh --fwhm 15 --cortex --tval avg-lh-thickness.15.mgh

Now I wanted to calculate also the thickness std mgh file. I tried this…

mris_surface_stats -surf_name fsaverage/surf/lh.white  -out_name lh_std.mgh -absmean lh_absmean.mgh -mean lh_mean.mgh -absstd lh_absstd.mgh avg-lh-thickness.15.mgh

but this calculation of the SD mgh files does not work, because I get no output. Is there another way to calculate the surface maps of the SD of cortical thickness?

Best,

René

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