By default, just the interior, though it is possible to get measures from the exterior doug
On 3/7/14 1:09 AM, ??? wrote:
Hi Doug, Sorry for forgetting to post to the list. The figure attached to this email could illustrate my questions. The blue region in the figure is a cortical parcellation (i.e. precentral) obtained by FreeSurfer. As I understand, the cortical parcellation has its own thickness (maybe 2~3mm) in actually, therefore, this cortical parcellation has interior surface (red line in the figure) and exterior surface (green line in the figure). The interior surface separates the white matter and the cortical parcellation, while the exterior surface separates the cortical parcellation and the skull. What I want to know is whether both the exterior surface and the interior surface are computed when FreeSurfer calculates the surface area. Thanks!
Zhuangming Shen
-----????----- *???:* "Douglas Greve" <greve@nmr.mgh.harvard.edu> *????:* 2014?3?6? ??? *???:* "???" <zhmshen@ion.ac.cn>, "free surfer" <freesurfer@nmr.mgh.harvard.edu> *??:* *??:* Re: [Freesurfer] Surface area in aparc stats Hi Zhuangming, please remember to post to the list. Thanks! I don't understand your question. What do you mean by the exterior, anterior, posterior, etc, surfaces? On 3/5/14 11:56 PM, ??? wrote:Hi Doug, Thank you for your prompting response. Do you mean the computation only calculate exterior surface of the cortical region ? The other five surface (i.e. anterior, posterior, left, right, interior) are excluded ? Thanks! Zhuangming -----????----- *???:* "Douglas Greve" <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> *????:* 2014?3?6? ??? *???:* freesurfer@nmr.mgh.harvard.edu <mailto:freesurfer@nmr.mgh.harvard.edu> *??:* *??:* Re: [Freesurfer] Surface area in aparc stats By default, the surface area is computed from the white surface (ie, boundary between WM and GM). It is possible to compute it from the pial surface (ie, boundary between GM and background) doug On 3/5/14 9:14 PM, ??? wrote:Hi all, I need to know how is the SurfArea in ?h.aparc.stats calculated by FreeSurfer? Since each cortical parcellation has its own thickness in 3D space, does the surface area computation consider both the exterior surface (i.e. the surface separating the gray matter and the background) and the interior surface (i.e. the surface separating the gray matter and the white matter)? Thanks! Zhuangming Shen _______________________________________________ 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
