Hello, I am doing tractography using FDT from FSL 3.3. I am using two symetrical masks. The numbers I am getting vary between 1 and 200 000 in the connected voxels. Is that normal!? I am using the default 5000 samples in the tractography toolbox. It looks like the number of voxel in one of the masks is multilplied by 5000 is that correct? thank you for the help, Paul Geha M.D. Northwestern University The Feinberg School of Medicine Department of Physiology M211 303 E. Chicago Ave. Chicago, IL 60611 Tel:312-503 2886 Fax: 312-503-5101