Re: [Freesurfer] Fw: Discrepancy between mris_preproc and mri_surf2surf results when mapping individual's measures to fsaverage space

oops, should have read your 2nd email. Yes, jacobian is the reason

On 3/20/2024 5:34 AM, tyzhang@ibp.ac.cn wrote:

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Dear FreeSurfer Experts,

Sorry, I think I've found the answer. It's because Jacobian correction was performed for mris_preproc, right?

Tongyu Zhang

-----原始邮件-----
*发件人:*tyzhang@ibp.ac.cn
*发送时间:*2024-03-20 16:31:23 (星期三)
*收件人:* freesurfer@nmr.mgh.harvard.edu
*抄送:*
*主题:* Discrepancy between mris_preproc and mri_surf2surf results
when mapping individual's measures to fsaverage space

Dear FreeSurfer Experts,

I'm currently working on mapping cortical morphometric
measurements from each individual in the HCP dataset to the
fsaverage space.

I have noticed that both the mris_preproc and mri_surf2surf
commands can achieve this function. However, I found that the
vertex-level measurements for cortical thickness, sulcal depth,
and curvatures are consistent between these two commands, but the
results for surface area and gray matter volume are totally different.

I am puzzled by this inconsistency and speculate that perhaps
these two commands are calculated on different surfaces? I don't
understand why the two commands get different results since the
inputs are the same.

My command are as follows: (Different surface area values will be
obtained in lh.area.fsaverage.mgh and lh.area.fsaverage.gii files)

mris_preproc --s  id  --meas  area --target fsaverage --hemi lh
–out /Results/CorticalFeatures/id/lh.area.fsaverage.mgh

mri_surf2surf --srcsubject id --trgsubject fsaverage --hemi lh
--sval /HCP/id/surf/lh.area --tval
/Results/CorticalFeatures/id/lh.area.fsaverage.gii

Thank you so much!

Tongyu Zhang

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