Hi Richard

what are you editing? And why would you expect the aseg.mgz to change if you are editing something downstream from it (like the wm.mgz)?

cheers Bruce On Mon, 2 Jul 2012, Richard Binney wrote:

Hi Freesurfers,

I've been trying to understand the implications of various types of edits in an attempt to solidify some standardized procedures regarding editing strategies, particularly in severely lesioned (and thus highly vulnerable to RECON failure) brains. In doing so I've been comparing volumes surfaces and segmentions pre- and post- edits/re-running RECON.

I've noticed that changes in surface reconstruction is, as expected, followed by changes in the aparc.2009s+aseg.mgz segmentation (exapnded/contracted in accordnace with surface) but I don't see similar alterations in the aseg.mgz segmentation.In fact the aseg.mgz is identical pre- and post-edits despite large changes in the WM.mgz and pial/WM surfaces.

Could you explain why this might be?

Thanks

Richard