Hi Peter, you cannot visualize fdt_paths as streamtubes, as it does not contain curves, it is effectively a visitation count map. You can however display it as a 3D volume. After opening fdt_paths in FSLview, you can open the 3D viewer (Tools->3D Viewer). Cheers, Stam ----- Original Message ----- From: "Tuo Peter Li" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, June 30, 2010 10:15 PM Subject: [FSL] Displaying results of probtrackX as streamtubes Is there a way to display fdt_paths, result of probtrackX as streamtubes in fsl 3D? Peter