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Get Coordinate Space for a Surface Template

Source: R/coordinate_spaces.R
get_surface_coordinate_space.Rd

Determine which standard coordinate space a surface template's vertices are defined in.

Usage

get_surface_coordinate_space(template_id)

Arguments

template_id

Character string identifying the surface template. Examples: "fsaverage", "fsaverage5", "fsaverage6", "fsLR".

Value

Character string indicating the coordinate space:

  • "MNI305" for fsaverage variants (fsaverage, fsaverage5, fsaverage6)

  • "MNI152" for fsLR (HCP template)

  • "Unknown" for unrecognized templates

Details

FreeSurfer's fsaverage surfaces were created using Talairach registration, which targets MNI305 space. All fsaverage density variants (fsaverage, fsaverage5, fsaverage6) share this coordinate system.

The HCP's fsLR template was designed to align with MNI152 space, so no transform is needed when working with MNI152 volumetric data.

See also

transform_coords, get_space_transform

Examples

get_surface_coordinate_space("fsaverage")   # "MNI305"
#> [1] "MNI305"
get_surface_coordinate_space("fsaverage6")  # "MNI305"
#> [1] "MNI305"
get_surface_coordinate_space("fsLR")        # "MNI152"
#> [1] "MNI152"