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Thank you for your reply.

However, my questions referred to whether a 3D Flair could also work for pial surface correction, or only 3D T2 flair is suitable and if it is ok for all participants not to have the same slice thickness on Flair, as I previously wrote most of my participants have slice thickness 1mm but some have 1.48 mm.

Thanks again,
Georgia

On 6 Jan 2021, at 1:37 AM, Georgia Kapizioni <geo.kapizioni@gmail.com> wrote:

Hello Freesurfer Developers,

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?

Thank you in advance,
Georgia