Re: [Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-16 Thread Bronwyn Overs
Yes that makes perfect sense. Thanks very much. > On 17 Jan 2015, at 7:01, Douglas N Greve wrote: > > > I don't have a core paper on the area mapping (which is more complicated > than mapping thickness). Anderson Winkler wrote a paper on the subject, > but we are not using his method. Our me

Re: [Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-16 Thread Douglas N Greve
I don't have a core paper on the area mapping (which is more complicated than mapping thickness). Anderson Winkler wrote a paper on the subject, but we are not using his method. Our method is relatively simple. Each vertex in fsaverage is mapped back to the individual to find the closest verte

Re: [Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-16 Thread Bruce Fischl
Hi Bronwyn the surface area at each vertex (I assume you mean vertex and not voxel) is simply the average of the area of the triangles it is attached to. cheers Bruce On Fri, 16 Jan 2015, Bronwyn Overs wrote: > Dear Mailing List, > > I would like to understand how freesurfer calculates the sur

Re: [Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-15 Thread Bronwyn Overs
I meant that as well as the mapping of the area to the average space. Kind regards, Bronwyn Overs Research Assistant Neuroscience Research Australia Neuroscience Research Australia Margarete Ainsworth Building Barker Street Randwick Sydney NSW 2031 Australia *M* 0411 308 769 *T* +61 2 9399 188

Re: [Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-15 Thread Douglas Greve
The computation is pretty simple, it is just the average of the area of the surrounding triangle. Is that what you mean or do you mean the mapping of said area to the average space? doug On 1/15/15 11:37 PM, Bronwyn Overs wrote: Dear Mailing List, I would like to understand how freesurfer

[Freesurfer] Freesurfer Calculation of Vertex-Wise Area

2015-01-15 Thread Bronwyn Overs
Dear Mailing List, I would like to understand how freesurfer calculates the surface area at each voxel to be used in the GLM procedure. Is there a key methods paper that describes this process, and can this method be explained in simple terms? -- Kind regards, Bronwyn Overs Research Assista