This is a bit of a hack, but it should work.
First, create an LTA file using tkregister, eg,
tkregister --targ vol0.5mm.mgz --mov vol1mm.mgz --regheader --reg deleteme.dat --ltaout reg.lta --noedit
Now create a registration file based on the "vox2ras" matrices in the two volumes. You can get these with
mri_info --vox2ras vol0.5mm.mgz mri_info --vox2ras vol1mm.mgz
Call these Va and Vb respectively
Now compute R = Va*inv(Vb)
Edit the reg.lta file to put the values for R in the file. There is a lot of stuff in that file, including a 4x4 matrix just above "src volume info". Replace this matrix with R
Now use mri_surf2surf to transform the surface into the 0.5mm space, something like
mri_surf2surf --reg reg.lta --s subject --sval-xyz white --tval-xyz vol0.5mm.mgz --tval ./lh.white.0.5mm
It may take some playing around to get it right (eg, try reversing the targ and mov (and Va Vb))
On 12/19/2017 07:33 AM, Luqi Cheng wrote:
Deer Freesurfer Experts,
I'm dealing with the monkey data. I convert the 0.5mm resolution monkey data into "fake" 1mm space using "mri_convert -iis 1 -ijs 1 -iks 1 "and create surfaces. I want to obtain the white/grey matter inferface in the raw 0.5mm volume space from white surface. I use the mri_surf2vol command but it is larger than the raw 0.5mm space. How could I acquire the white/grey matter inferface in the raw 0.5mm space ?
Thank you very much.
Best, Luqi
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