Hi -
If one has a surface that is aligned to a volume in CARET, is it possible
(or rather, is there a general procedure) to export the volume and the
surface into freesurfer?
The volume in CARET won't be conformed. It's header will define the origin
such that CARET interprets a specific voxel/coordinate as the anterior
commisure.
The surface will be aligned to the volume in the sense that it's
co-ordinates are with respect to that anterior commisure definition.
What I need to do is run mri_convert -c to conform the volume, and then
convert the surface to freesurfer format in such a way that it's now
aligned to the conformed volume in freesurfer.
Then I'd do some stuff (refine the surface) in freesurfer, and export the
surface back to CARET.
That's the general issue. Details include: the surface will need to be
transformed so that it appears to freesurfer to be 1mm data, and the volume
will have it's header changed so that it claims 1mm voxels (the data is
higher resolution than 1mm).
The problem can be considered as finding the inverse of Van Essen's
Freesurfer to F99 pipeline. Or, "Surefit to Freesurfer" is a better way to
look at it. The surfaces are *white and *pial though.
It's some scaling, translating, conforming and format conversions. Other
stuff is not a worry.
connectome workbench, FS, CARET, FSL, MATLAB whatever are all
relevant/involved tools
hope can help
Colin Reveley