hi, all
does freesurfer v5 have multiple fsaverage subjects with varying number of vertices?
see the following mails; where does fsaverage6 locate?
-------------------------------------------------------------------- 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).
-------------------------------------------------------------------- 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.
- 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
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?
Nick Schmansky nicks at nmr.mgh.harvard.edu Fri Sep 10 15:23:09 EDT 2010 * Previous message: [Freesurfer] two questions about freesurfer * Next message: [Freesurfer] memory error and WM edits * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]
- 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).
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.
- 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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