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I should have mentioned that the HCP data have been processed using FS5.3HCP. If we know which code/script generates sulc files, we can try to dig out the code to find the scaling factor.

On Thu, Nov 12, 2020 at 9:46 PM Reza Rajimehr rajimehr@gmail.com wrote:

Thanks Doug! It would be great to know what the exact scaling factor is. The HCP data have been processed/analyzed using FS5.3. We have a set of new subjects that have been processed using the new version of HCP pipeline which is based on FS6.0. Since we want to compare the maps between the two datasets, we really need to know how the units are converted between the two versions of Freesurfer.

Thanks in advance for your help, Reza

I think it is probably just scaling, but it has been a long time since 5.3 and 6.0

On Mon, Nov 9, 2020 at 3:10 PM Reza Rajimehr rajimehr@gmail.com wrote:

...

Hi,

In the .sulc files, the range of sulcal depth values are very different (about 10 times higher) in Freesurfer v6 compared to Freesurfer v5.3. Is there just a simple scaling factor here, or the procedure for calculating sulcal depth has been changed?

Thanks, Reza