Hi Eduardo
the folding metrics were proposed by David Van Essen in an oldish paper
of his. Sorry, I don't remember exactly which one - you'll have to poke
around (or ask him). You could also look at LGI
cheers
Bruce
On Thu, 12 May 2016,
Caverzasi, Eduardo wrote:
> Hello all,
>
> I am not sure
Hello all,
I am not sure my previous email was received.
We are looking at developmental anomalies in children and we using Freesurfer
to asses thickness, volume but also local gyration indexes, using QDEC tool but
also extrapolating the actual values for correlations.
The local gyration index
Correction: FI = Sum-over-vertices[ |kmax|(|kmax|-|kmin|)]/SurfaceArea
On Sep 28, 2011, at 1:38 PM, Donna Dierker wrote:
> My understanding is that GI is also a global summary stat across the whole
> hem, while lGI is *local* GI (vertex-wise). It measures how folded the
> cortex is at that ve
My understanding is that GI is also a global summary stat across the whole hem,
while lGI is *local* GI (vertex-wise). It measures how folded the cortex is at
that vertex. GI and lGI are based on area, while the folding index is based on
curvature. Truly different measures.
Gyrification Inde
have a look at this page:
https://surfer.nmr.mgh.harvard.edu/fswiki/LGI
folding index is typically a single number summarizing the amount of
folding overall on a surface. freesurfer puts these measures in
subjid/stats/?h.curv.stats.
gyrification index is a new method created by maria schaer to
Hi Bruce, Nick & Doug:
How does Folding index differ from Gyrification index?
thanks,
Alan
BIDMC
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The information in this e-mail i
Hi all,
I'm trying to extract the folding index for each subject/hemisphere/roi from
?h.aparc.stats into a single table with all subjects. It appears though that
aparcstats2table will only extract area, volume, thickness, thicknessstd and
meancurv, not folding index, even though these values a
Very interesting debate you keep here, gentlemen.
I went on and divided FI by the area in one reference and one pathological
subjects (and age matched references). Now it seems that the "NewFI" is quite
correlated with cortical thickness. It even decreases from the frontal,
through parietal to
[Bruce wrote]
sounds reasonable to me, but we should call it something else (normalized
FI/CI?)
Yes, dividing out area does look like a first step, justified by the way
the per-vertex values are calculated. This gives the result units of mm^-2,
which maybe has an interpretation something alon
sounds reasonable to me, but we should call it something else (normalized
FI/CI?)
On Mon, 19 Nov 2007, Rudolph Pienaar wrote:
Hi Graham -
First off, your observation that the FI seems correlated with area is
completely correct. I'm not sure if you have the FS source code? Anyway,
looking at t
On Monday 19 November 2007 09:07, Graham wrote:
> 1. DVE's description of the FI calc, which it looks like FS implements
> (assuming FS's k calcs are faithful -- that code is hard to follow.)
Yep - that the code can be hard to follow. Still, you can assume that FS's k
calcs are faithful. But on d
Hi Graham -
First off, your observation that the FI seems correlated with area is
completely correct. I'm not sure if you have the FS source code? Anyway,
looking at the relevant code in 'mrisurf.c', the
MRIScomputeCurvatureIndices(...)
function pretty much computes the folding index
Folks:
We're wondering about how FS's "folding index" corresponds to Van Essen's
calculation (J Neurosci, 1997 Sept 15).
In particular, do the FI values for each region factor out the area of the
region or not. When we plot them the FI values look extremely correlated
to area, but that does
Ok, that is what I thought- thanks.
Sasha
>>> Bruce Fischl <[EMAIL PROTECTED]> 2/19/2007 4:19 PM >>>
Hi Sasha,
the folding index is computed across the whole surface, so how would
you
display it? You can display H, K, k1 and k2 if you want (you can
compute
them with mris_curvature -w ...)
Bruc
Hi Sasha,
the folding index is computed across the whole surface, so how would you
display it? You can display H, K, k1 and k2 if you want (you can compute
them with mris_curvature -w ...)
Bruce
On Mon, 19 Feb 2007,
Sasha Wolosin wrote:
Dear all,
Is it possible to display folding index
Dear all,
Is it possible to display folding index on the cortical surface?
Thanks,
Sasha
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