The ces.nii.gz file will contain the percent with respect to the mean signal in the brain. The cespct.nii.gz will contain the percent with respect to the mean time series of the voxel.

On 5/30/2021 9:42 AM, Star Xi wrote:

External Email - Use Caution

Hi, dear FS experts,      I'm trying to use /mir_segstats /to extract % signal change in task fMRI analysis. The command is:

  o mri_segstats --I ./ces.nii.gz --annot fsaverage rh
    perm.th30.pos.sig.ocn.annot --excludeid 0 --avgwf
    rh.ces.avgwf.dat;

There are two kinds of contract files (ces.nii.gz and cesspit.nii.gz), and I wonder which one should be used to calculate extract % signal change. In another words, if I use “mri_segstats  —i cespct.nii.gz --avgwf file.dat”, does the  file.dat contain "% signal change" data? (The webpage says “ avewf means computes the average waveform across all the voxel" ) Thx a lot!

Star

///Sida Xi, M.D./

/Department of Ophthalmology/

/Eye and ENT Hospital, /

/Fudan University School of Medicine, /

/83th Fenyang Rd, Xuhui District, Shanghai, China/

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer