Compute vox2ras-tkreg matrix from basic MGH header fields.

This is also known as the 'tkreg' vox2ras. It is the inverse of the respective ras2vox, see mghheader.ras2vox.tkreg.

Usage

mghheader.vox2ras.tkreg(header)

Arguments

header

the MGH header

Value

4x4 numerical matrix, the transformation matrix

See also

sm0to1

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

Examples

brain_image <- system.file("extdata", "brain.mgz",
  package = "freesurferformats",
  mustWork = TRUE
)
vdh <- read.fs.mgh(brain_image, with_header = TRUE)
mghheader.vox2ras.tkreg(vdh$header)
#>      [,1] [,2] [,3] [,4]
#> [1,]   -1    0    0  128
#> [2,]    0    0    1 -128
#> [3,]    0   -1    0  128
#> [4,]    0    0    0    1