Compute tkreg-RAS to scanner-RAS matrix from basic MGH header fields.

This is also known as the 'tkreg2scanner' matrix. Note that this is a RAS-to-RAS matrix. It is the inverse of the 'scanner2tkreg' matrix, see mghheader.scanner2tkreg.

Usage

mghheader.tkreg2scanner(header)

Arguments

header

the MGH header

Value

4x4 numerical matrix, the transformation matrix

See also

Other header coordinate space: mghheader.is.ras.valid(), mghheader.ras2vox(), mghheader.ras2vox.tkreg(), mghheader.scanner2tkreg(), mghheader.vox2ras(), mghheader.vox2ras.tkreg(), 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.tkreg2scanner(vdh$header)
#>      [,1] [,2] [,3]        [,4]
#> [1,]    1    0    0  -0.4999542
#> [2,]    0    1    0  29.3727417
#> [3,]    0    0    1 -48.9047318
#> [4,]    0    0    0   1.0000000