I am conducting a group analysis between a patients and a control group. I have accomplished recon-all individual analysis and I want to correct pial surface using 3D Flair. 

I would like to ask two specific things:

1. Is 3D Flair appropriate or only T2 Flair is recommended for such correction. From what I have read on previous posts, it is usually recommended to use T2 Flair.

2. For my data, for most of my 3D data slice thickness is 1 mm, but for some of them is 1.48 mm. Is that difference going to affect analysis results?