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)?

 

2. How can I convert the freesurfer surface format to gifti, with two hemisphere surfaces in one gifti file. And how can I write the parcellation of surface to another gifti file which is corresponding to the gifti of surface data?

 

Many thanks.