Thanks a lot, Bruce
If I want to compare the surface area between the patients and healthy control groups, which area file should I use? The area or the area.pial? Or I should compare both of them? If I should use both, is there any possibility that I would obtain different results from area and area.pial? I mean, in this case, a brain region has significantly different area but same (not significant) area.pial. How can I explain them in my research paper?
BTW, just out of curiosity, in the stats file such as lh.aparc.stats, why just thickness has the mean and std value, but other measures do not have the std value? SurfArea GrayVol ThickAvg ThickStd MeanCurv GausCurv FoldInd CurvInd
Best, Feng
发件人：Bruce Fischl fischl@nmr.mgh.harvard.edu 发送时间：2015-10-06 20:45 主题：Re: [Freesurfer] Query about the calculation of surface area 收件人："Freesurfer support list"freesurfer@nmr.mgh.harvard.edu 抄送：
yes, that is correct Bruce
On Tue, 6 Oct 2015, chenhf_uestc wrote:
Thanks, Bruce So, in the stats folder of each subject, the lh.aparc.a2009s.stats file provides surfarea of each region. This value is the area for the white surface, right? Is the area of each vertex obtained by the average the area of triangles su rrounding the vertex? Best, Feng
发件人：Bruce Fischl <fischl@nmr.mgh.harvard.edu>发送时间：2015-10-06 20:25 主题：Re: [Freesurfer] Query about the calculation of surface area 收件人："Freesurfer support list"freesurfer@nmr.mgh.harvard.edu 抄送：
Hi Feng
we compute the surface area of each surface and store it separately. The ?h.area files are for the white surface and the ?h.area.pial for the pial
cheers Bruce On Tue, 6 Oct 2015, chenhf_uestc wrote:
Dear Freesurfer experts,
I have a question about the calculation of surface area. The cortical thickness is the distance between the pial and white matter. But, what ab
out
the surface area? Calculation based on pial or white matter? Or average t
he
area of both of them.
Is the area of each vertex obtained by the average the area of triangles
?? ?> surrounding the vertex?
In addition, where can I find the definition of meancurv, gauscurv, foldi
nd,
curvind? I do not find it in the fswiki.
Best, Feng
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