Hi HweeLing,
sorry, there's not much that we can tell you. Basically the only thing you can do is to visually assess whether the pial surface representation follows what you believe is the true pial surface. I think the wiki has examples of good pial surfaces. If not, we can put some up.
cheers, Bruce
On Tue, 25 Apr 2006, Lee HL wrote:
Hi, I'm a freesurfer newbie. I was wondering what constitutes a good grey-white matter segmentation and a good pial surface outline? I've been trying to follow the exercise from the website with respect to the manual intervention, using my own data as an experience, but I don't know how best to decide what is good or bad. Are there any more detailed documentation with respect to troubleshooting? Pardon my ignorance. Thanks!