Applying this matrix to a FreeSurfer CRS index of a conformed volume will give you the RAS coordinates of the voxel in surface coordinates, i.e., in the coordinates used in surface file like 'lh.white'. The central voxel is 127,127,127 when using zero-based indices (or 128,128,128 when using one-based indices), meaning its surface RAS coordinates are 0.0, 0.0, 0.0. The returned matrix is the inverse of the 'ras2vox_tkr' matrix.
numeric 4x4 matrix, the FreeSurfer vox2ras_tkr matrix.
Other surface and volume coordinates:
1 2 3 4 5
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