Hello,
I'm trying to convert vertex number to area size in fsLR space because area size, rather than vertex number, is comparable across data from different coordinate space (e.g. fsaverage, fsLR). However, unlike to freesurfer, I could not find any files like lh.area in HCP folders. This paper (see reference) mentioned that all of the gray matter sampled at a 2 mm average vertex spacing on the surface and as 2 mm voxels subcortically. Could I explain this as the area size of each vertex is 4 mm2, and they are isotropic? I have calculated if my understanding is right, the volume of the grey matter in left hemisphere is 259936 mm3, which is similar to the value calculated in fsaverage space (by checking information of aseg.stats, 277114.15 mm3 as one of my subject). I could not make sure if my understanding is correct, more information is better for me to do further analysis. Thanks in advance! Taicheng Reference: Glasser MF, et al. (2013) The minimal preprocessing pipelines for the human connectome project. Neuroimage 80:105-124. _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
