ras.to.surfaceras: Translate RAS coordinates, as used in volumes by applying...

In freesurferformats: Read and Write 'FreeSurfer' Neuroimaging File Formats

Translate RAS coordinates, as used in volumes by applying vox2ras, to surface RAS.

Description

Translate RAS coordinates, as used in volumes by applying vox2ras, to surface RAS.

Usage

ras.to.surfaceras(header_cras, ras_coords, first_voxel_RAS = c(1, 1, 1))

Arguments

header_cras	an MGH header instance from which to extract the cras (center RAS), or the cras vector, i.e., a numerical vector of length 3
ras_coords	nx3 numerical vector, the input surface RAS coordinates. Could be the vertex coordinates of an 'fs.surface' instance, or the RAS coords from a surface label.
first_voxel_RAS	the RAS of the first voxel, see mghheader.centervoxelRAS.from.firstvoxelRAS for details. Ignored if 'header_cras' is a vector.

Value

the surface RAS coords for the input RAS coords

Note

The RAS can be computed from Surface RAS by adding the center RAS coordinates, i.e., it is nothing but a translation.

freesurferformats documentation built on May 29, 2024, 5:29 a.m.