Iris, the registration targets were derived differently. With version 4,
we automatically fill in all the ventricles. In verion 3, they were
partially filled in manually. Version 3 creates a surface around the
ventrical making it look like a sulcus, and this affects both the target
and the registration to the target. So, on most of the surface, the
registration will be very close, but it will deviate signifiacntly
around the ventricles/medial wall. I think the fsfast in version 4
should work fine with the anatomicals (including fsaverage) of version 3.
doug
Steinmann, Iris wrote:
Hi,
we have several reconstructed brains, which were processed by freesurfer 3.0.5.
We also kept using the fsaverage data from 3.0.5 in order to be consistent.
We wish to do fMRI analysis with freesurfer/fs-fast 4.0.5 and found that
talairach coordinates differ slightly
when using the fsaverage from version 3.0.5 and the current fsaverage from 4.0.5.
Yet, the both volumes appear pretty similar, the newer one maybe a little bit smoother.
We would like to know what constitutes the exact difference between these two
fsaverage datasets and
whether it is possible to use the new version for analysis with the "old" fsaverage data without
getting inconsistent results.
Thanks a lot,
Iris
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