Hi Yerong the parcellations are done on the surface to generate the annot files. These are then sampled into the cortical ribbon to extend the aseg so that every voxel in the cortex is given a label from the corresponding annot file (aparc+aseg.mgz from aparc.annot and aparc.a2009s+aseg.mgz from aparc.a2009s.annot)
cheers Bruce On Tue, 8 Jan 2019, Yerong Li wrote: > External Email - Use Caution > > Dear Freesurfer experts: > > I am on ROI analysis tutorial: > https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/AnatomicalROIV6.0 > > And I am trying to understand the relationship between: > > /label/?h.aparc.annot and /mri/aparc+aseg.mgz > /label/?h.aparc.a2009s.annot and /mri/aparc.a2009s+aseg.mgz > > I understand /label/?h.aparc.annot corresponds to "Desikan-Killiany > atlas" and its labels have 35 different labels (except unknown 0), > while in several cases you mentioned that "/mri/aparc+aseg.mgz" > corresponds to "Desikan-Killiany atlas", which I DO NOT understand. > "/mri/aparc+aseg.mgz" to me are subcortical segmentations while > "/label/?h.aparc.annot" are cortical(surface) parcellations. > "Desikan-Killiany atlas" should mean "cortical (surface) > parcellations". That's why I do not understand why > "/mri/aparc+aseg.mgz" corresponds to "Desikan-Killiany atlas"? > > Could anyone help me understand this? > > Yerong > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
