[Freesurfer] How to map ROI to native space

Hi all,

I have one problem about rending ROI from VBM onto Freesurfer average surface and extracting thickness in this ROI region. I have already extracted one cluster (my ROI ) from VBM_derived group difference t_statistic map.

I got a lot of information from this mail list, especially Alex's mail (thanks!!).

Now I got the steps for my analysis as following:

1) Mapping ROI.img from MNI space to the native space of each subject. (I don't know how to do this step)

2) Convert volumetric mask to a label (using mri_vol2surf and mri_cor2label).

3) Extract thickness in this label for each subject (using mris_anatomical_stats).

I read Voets' paper about this topic, but he just wrote "first inverse-warping the VBM group difference t_statistic map to native space of each subject" and there was no detailed information how to do it. I saw a lot information about the topic of VBM and Freesurfer in the mail list, but I did not find the exact method for my problem.

Anyone has idea about my problem??

Any help will be appreciated!

Thanks in advance!

Li