I am trying to find the APARC+ASEG nifti file used by freesurfer, along with a file / table with the nomenclature of the ROIs (i.e., list of ROIs with labels). Could you help me out, please?
I have generated a set of APARC+ASEG nifti files two years ago. The mriconvert tool in freesurfer was used to generate these nifti files. I almost forgot details about converting parameters used for these files. So I am not very sure for the spatial accuracy of these volume-space files. Here attached these files, I hope this would be helpful. The nomenclature of the ROIs could be found in FreeSurferColorLUT.txt.
If you would like to do this convertion by yourself, I would recommend freesurfer's mriconvert tool.