Hi Adam, use the "paired" method in the fsgd examples. doug
On 06/29/2012 11:58 AM, Adam Nitenson wrote:
Hi all,
I am trying to visualize the surface map showing the Post Treatment - Pre Treatment cortical thickness in a single subject. The Post and Pre scans are processed like 2 separate subjects.
I used the commands:
mris_preproc --f /cluster/roffman/users/Stable5_PerRun/Subject_Files/FB12_Pairs/FB0011040 --target fsaverage1 --hemi lh --meas thickness --out /cluster/roffman/users/Stable5_PerRun/Analyses_Patients/FB12_Pairs/FB0011040/THICKNESS-MAP-LH.mgh
and
mri_glmfit --y /cluster/roffman/users/Stable5_PerRun/Analyses_Patients/FB12_Pairs/FB0011040/THICKNESS-MAP-LH.mgh --fsgd /cluster/roffman/users/fsgd/FB12_Pairs/FB0011040.fsgd --C /cluster/roffman/users/fsgd/Top_Minus_Bottom.mtx --glmdir /cluster/roffman/users/Stable5_PerRun/Analyses_Patients/FB12_Pairs/FB0011040/Post_Minus_Pre/LH --surf fsaverage lh --fwhm 4.6
The subject and fsgd lists only have 2 subjects (the post and the pre) and the contrast is the 1 -1, same as the group.diff.mtx on the Wiki.
I receive the error DOF = 0, which is likely because each group only has 1 subject. Usually I have multiple subjects in each group. Is there an alterate way to generate this difference map when only using 2 subjects??
Best,
Adam Nitenson, B.S. Brain Genomics Lab Massachusetts General Hospital nitenson@nmr.mgh.harvard.edu Phone: 617-643-3215 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer