Applying this matrix to a FreeSurfer surface RAS coordinate (from a surface file like 'lh.white') will give you the voxel index (CRS) in a conformed FreeSurfer volume. The returned matrix is the inverse of the 'vox2ras_tkr' matrix.
numeric 4x4 matrix, the FreeSurfer ras2vox_tkr matrix.
Other surface and volume coordinates:
1 2 3 4
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