Hi Nicole

no, you don't need to worry about them. That's one of the reasons we use the surfaces for cortical morphometry instead of the voxel-based measures.

cheers Bruce On Wed, 13 Jun 2012, Nicole Senecal wrote:

Hi all, I'm noticing that when pulling up a brainmask volume with surfs and aseg on, the pial and white surfaces are (thankfully) very often correct, but the aseg in cortex is a bit off - often including parts of the skull/dura as gray matter - even though the pial surface does follow this boundary correctly. As long as the surfaces are correct, and my primary interest will be cortical thickness, do I need to worry about these inaccuracies in the aseg? Is checking the aseg primarily done for ensuring accuracy in subcortical structures rather than in cortex?

thanks, Nicole

-- Nicole Senecal Neuroscience Graduate Group Kable Lab 3720 Walnut St., Room C37 Philadelphia, PA  19104 Lab phone:  215-746-4371