yes, it is a 6th order icosahedron. Here is a list of the number of
vertices with each order
3 642
4 2562
5 10242
6 40962
7 163842
On 5/25/11 11:08 PM, Dai Dai wrote:
hi, all
does freesurfer v5 have multiple fsaverage subjects with varying
number of vertices?
see the following mails; where does fsaverage6 locate?
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Nick Schmansky nicks at nmr.mgh.harvard.edu
Fri Sep 10 15:23:09 EDT 2010
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1. in freesurfer v5, there are now multiple fsaverage subjects with
varying number of vertices. fsaverage6 has about 40,000 vertices per
hemi, so you can just include the flag:
--target fsaverage6
after the -qcache flag, and it will use that as the target instead of
fsaverage (producing files like 'rh.thickness.fsaverage6.mgh', which
will have 40K thickness samples).
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On Fri, 2010-09-10 at 15:19 +0800, Dai Dai wrote:
> Hi, all
>
> I am a new user of freesurfer and now I have two questions.
>
> 1. For my work, the number of vertex in surface data is too much to
> process. How can I downsample the surface mesh as well as the
> curvation file (e.g. thickness)? The vertex number of fsaverage
> template is ~160,000, normally more than that of every subject. Can I
> construct an average surface of less vertexes or downsample the
> fsaverage surface to that of ~20000 vertexes and then transform all
> the subjects using these templates with less vertexes (using recon-all
> -qcache)?
2011-05-26
Dai Dai
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