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Dear Freesurfer experts:
Hello! I'm a new student to surface based fMRI analysis. Now I'm
dealing with a functional parcellation problem. The subjects in my dataset
has different vertex number and I need to do a group level parcellation, so
I decided to make a group reference template.
My step is almost following this post:
https://www.mail-archive.com/freesurfer@surfer.nmr.mgh.harvard.edu/msg00420.html
,the lh.wholebrain.tif and lh.sphere.reg for two test subjects have
successfully generated. But I'm still wondering about these files and what
to do next to get my individual fMRI time series on vertex registerd to the
template.
The second question is, the vertex number (~100000) is much more
than my voxel based masked data (~50000). Neither is easy to do the
susequent analysis efficiently. So how should I correctly downsample it?
Should I downsample the template or downsample my surface before making
template? Will mris_decimate work?
The last question is my subject has gifti format sulc and curv data
(.shape.gii). I have tried to use MRI_read and MRI_write to write to an
.mgh file and add -sulc sulc.mgh for each command and they seems worked.
Can I convert them to file like .sulc? Or just keep the .mgh and -sulc
sulc.mgh is OK?
I'm looking forward to hear your reply! Really thanks for your help!
Best wishes,
Jingyue Zhang
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