Hi Claudia
the first thing to do is run recon-all -all to complete a recon. Then you look through your data (surfaces overlaid on volumes) and determine if it is accurate (or accurate enough). If not, then control points are one possible intervention, and yes you would put them in regions of non-partial-volumed WM in which the intensity is < 110. This can cause the pial surface to move out as well as the white surface, but there are other reasons things can go wrong also such as topological defects and such.
cheers Bruce
On Mon, 18 Mar 2013, Claudia Dacquino wrote:
Hi everyone, I'm a very new fresurfer user and I have to understand the very simple basis of its use yet. So I have some maybe stupid questions about that. I heve to work on cortical thickness, so I suppose I have to complete the segmentation and then correcting CPs and Pial surface. The first question is if I have to edit CPs first and then, after running recon-all -autorecon2-cp -autorecon-3, to edit the Pial surface? The second is in the CPs editing have I to add ctrl pts in white matter areas that are less then 110 in voxel intensity? The last one is how do I have to correct the grey matter? Have I to paint all the None Sgmtn label points, or just the ones incorporating a piece of dura? Thanks a lot, and sorry for the very basic questions.