Hi Julie,

not sure what to say re FAST. They are different algorithms with the same goal, and so will generate somewhat different results.

In general we find that the surface-based measures of cortex are more accurate than the voxel ones.

cheers, Bruce

On Fri, 4 Dec 2009, Julie McEntee wrote:

Hi,

So far, I have results from ­autorecon1 & -subcortseg. The aseg.stats that are obtained following these procedures contain measures of L & R-Cerebral-White-Matter and ­Cerebral Cortex. If I created masks (bitmaps) using these labels in FreeSurfer, would they be equivalent to whole-brain WM and GM, or do I need to use maps/surfaces created further along in the FreeSurfer processing stream (if so, which would be accurate)?

In general, how would these differ from the tissue segmentations obtained using FSL-FAST?

Thank-you for your help,

Julie

Julie E. McEntee, MA, CCRP Senior Research Program Coordinator Department of Psychiatry- Neuroimaging Johns Hopkins University School of Medicine 600 N. Wolfe St./Phipps 300 Baltimore, MD 21287 Phone: 410-502-0468 Fax: 410-614-3676