Hi Sarah, I can image several ways to do this. If you can go onto the surface and find an index that you want to be the center, then you can create a label file with a single point. It would look something like this (see fsaverage/label/lh.cortex.label for example):
------------------cut------------------------------ #!ascii label , from subject vox2ras=TkReg 1 10000 -27.106 -80.730 11.969 0.0000000000 ------------------cut------------------------------
In this case, the only thing that matters is the vertex number (10000). Replace 10000 with your vertex number. Assuming this file is called lh.point.label, run
mri_label2label --srclabel lh.point.label --dilate 20 --s yoursubject --hemi lh --trglabel ./lh.point20.label --regmethod surface
This will create a new label that has been dilated 20 times. You can load it in tksurfer.
Is this what you want to do?
doug
On 07/11/2013 02:55 PM, sarahp@nmr.mgh.harvard.edu wrote:
I'd like to make a circle of a pre-defined size on the freesurfer surface, with RAS coordinates as the center of the circle. What would be the best way to do this?
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