At the beginning I thought the same thing but a colleague built an another specific template with n = 40 like fsaverage. The results seems to be equivalent. Actually it is weird because when you look at the shape of the inflated fsaverage, it is smoother than mine but when you look at the curvature profile, gyri and sulci seem to be smoother in my template than in fsaverage. Do you have an explanation ? Maybe the treatment of our subjects is less precise than the one used for images required to build fsaverage ?

De : Bruce Fischl <fischl@nmr.mgh.harvard.edu>
Date : vendredi 18 octobre 2013 04:01
À : Sophie Maingault <sophie.maingault@etud.u-bordeaux2.fr>
Cc : "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Objet : Re: [Freesurfer] Comparison between fsaverage and a template created from scratch

Hi Sophie
I think fsaverage was made from 40 subjects so your 80 subject average will naturally be smoother
Cheers
Bruce



On Oct 11, 2013, at 11:35 AM, Sophie Maingault <sophie.maingault@etud.u-bordeaux2.fr> wrote:

Hello Experts,

I did the procedure to create a template from scratch by following the steps explaining in this page : http://surfer.nmr.mgh.harvard.edu/fswiki/SurfaceRegAndTemplates

The objective was to create a template to use it in the command recon-all –qcache –target my template.

So, after creating mytemp2.tif I did mris_register for the subjects used for the template (80 subjects) and then I used make_average_subject --subjects <80 subjects> --out mytemplate. Finally I ran recon-all -qcache –target  mytemplate in order to visualize my analyzes in QDEC. This procedure seems correct to you because when I just visually compared your template (fsaverage) with mine it looks like very different, as if mine was more smoothed (cf ppt file) ? What do you think ?  

Best regards.

Sophie Maingault

<fsaverage VS my template.pptx>
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