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Load transformation matrix from a FreeSurfer linear transform array (LTA) file.

Source: R/read_fs_transform.R
read.fs.transform.lta.Rd

Load transformation matrix from a FreeSurfer linear transform array (LTA) file.

Usage

read.fs.transform.lta(filepath)

Arguments

filepath

character string, the full path to the transform file.

Value

4x4 numerical matrix, the transformation matrix

Note

I found no spec for the LTA file format, only example files, so this function should be used with care. If you have a file that is not parsed correctly, please open an issue and attach it.

See also

Other header coordinate space: mghheader.is.ras.valid(), mghheader.ras2vox(), mghheader.ras2vox.tkreg(), mghheader.scanner2tkreg(), mghheader.tkreg2scanner(), mghheader.vox2ras(), mghheader.vox2ras.tkreg(), read.fs.transform(), read.fs.transform.dat(), read.fs.transform.xfm(), sm0to1(), sm1to0()

Examples

tf_file <- system.file("extdata", "talairach.lta",
  package = "freesurferformats", mustWork = TRUE
)
transform <- read.fs.transform.lta(tf_file)
transform$matrix
#>             [,1]         [,2]        [,3]      [,4]
#> [1,] 1.054775715  0.007081697 -0.05151368 -2.029556
#> [2,] 0.005556736  1.116058946  0.33849043 -5.882306
#> [3,] 0.060359493 -0.274788439  0.85348159 37.464622
#> [4,] 0.000000000  0.000000000  0.00000000  1.000000