talairachras.to.ras {freesurferformats}

Compute MNI talairach coordinates from RAS coords.

Description

Compute MNI talairach coordinates from RAS coords.

Usage

talairachras.to.ras(tal_ras_coords, talairach)

Arguments

tal_ras_coords

coordinate matrix in Talairach RAS space

talairach

the 4x4 numerical talairach matrix, or a character string which will be interpreted as the path to an xfm file containing the matrix (typically '$SUBJECTS_DIR/$subject/mri/transforms/talairach.xfm').

Value

the Talairach RAS coordinates for the given RAS coordinates. They are based on a linear transform.

Note

You can use this to compute the Talairach coordinate of a voxel, based on its RAS coordinate.

References

see https://en.wikipedia.org/wiki/Talairach_coordinates