Hi Feng
they are slightly different measures so which one you use really depends
on your biological hypothesis.
For thickness there are multiple measures within each ROI but only one area
(that of the whole ROI), so mean and std doesn't make sense.
cheers
Bruce
On Wed, 7 Oct 2015, chenhf_uestc wrote:
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 <fis...@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 <fis...@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 triangle
s
?? ?> surrounding the vertex?
> > In addition, where can I find the definition of meancurv, gauscurv, fol
di
> nd,
> > curvind? I do not find it in the fswiki.
> >
> > Best,
> > Feng
> >
> >
> >
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