Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

This helps immensely, thank you! On Tue, Oct 14, 2014 at 4:52 AM, Anderson M. Winkler wrote: > Hi Emma, > > Please, see below: > > On 13 October 2014 20:11, Emma Thompson wrote: > >> Hi Anderson, >> Thank you for your paper. I guess I am confused. I have analyzed my >> structural data with qdec

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

If you are using --qcache, then there is nothing wrong specifically with the qdec implementation On 10/13/2014 03:11 PM, Emma Thompson wrote: > Hi Anderson, > Thank you for your paper. I guess I am confused. I have analyzed my > structural data with qdec, specifically looking at a measure of >

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

Hi Emma, Please, see below: On 13 October 2014 20:11, Emma Thompson wrote: > Hi Anderson, > Thank you for your paper. I guess I am confused. I have analyzed my > structural data with qdec, specifically looking at a measure of cortical > thickness and volume. I'm considering looking at surface a

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

Hi Anderson, Thank you for your paper. I guess I am confused. I have analyzed my structural data with qdec, specifically looking at a measure of cortical thickness and volume. I'm considering looking at surface area as well but was told it wasn't a very good measure using qdec, I have no other info

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

Hi Donna, In that same paper we also comment on the differences between expansion/contraction and absolute areal measurements assessed at each face of the surface (i.e., facewise), which can, after interpolation, be converted to vertexwise to facilitate analysis using current tools (e.g., mri_glmf

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

Hi Emma, Could you clarify what would be the disadvantages that you've heard about? I ask because we've studied and tried to clarify many aspects of the analysis of surface area in this paper . Maybe if there's something not cover

Re: [Freesurfer] cortical surface area measurement and vertex-wise analysis

Hi Emma, I might not be the only one who is unsure what you mean by a vertex-wise cortical surface area measure. Do you mean something like what is illustrated in figures 2 and 3 here: http://www.pnas.org/content/107/29/13135.figures-only … which is similar, but not identical to the local gyr

[Freesurfer] cortical surface area measurement and vertex-wise analysis

Dear Freesurfers, I recently heard that there are several disadvantages to using a measure of cortical surface area in Freesurfer, specifically due to conducting a vertex-wise analysis. Can someone help me understand why a measure of surface area using this approach might be flawed? Thanks! ___