Hello,

I'm new to freesurfer and have been trying to use it for cortical parcellation of individual T1s running recon-all -s subID -i sunT1 -all command. I'm specifically interested in getting parahippocampal and perirhinal ROIs for each individual. It appears that the parcellation is correct for the left hemisphere but not for the right hemisphere... I found that there were also mislabeling for precentral and postcentral gyrus (as easy gyri to identify), and that regardless of if I looked at the aparc.annot or the aparc.DKTatlas.annot parcellation scheme.

Is there any reason why I have this systematic mistake? Attached is the example for one subject (others looked very similar).

Thanks

Amal