We would like to confirm that we are getting identical results from multiple freesurfer runs on the same data set.

To do so we are comparing identically named files using md5sum and would very much appreciate your thoughts on our results.  For multiple files, we concatenate them and pipe the output into md5sum.  Below is a table showing what we’ve found so far.  I take hope from the positive matches we get from all of the .annot files and from the fact that 001.mgz does not match.  This latter suggests that there is a date or something embedded in some of the files from separate runs which defeats the match.

Please let us know what you know about this and thanks.

file(s)	md5sum result
label/*.annot	match
label/*.label	match
mri/wmparc.mgz	mismatch
surf/qsphere.nofix surf/rh.sphere	mismatch
mri/orig/001.mgz	mismatch
mri/transforms/talairach.m3z	match
mri/transforms/talairach.m3z.inv.x.mgz mri/transforms/talairach.m3z.inv.y.mgz mri/transforms/talairach.m3z.inv.z.mgz	mismatch mismatch mismatch

Best - Don

Don Krieger, Ph.D.

Department of Neurological Surgery

University of Pittsburgh