Create cortical atlas from a CIFTI file — create_cortical_from

Build a brain atlas from a CIFTI dense label file (.dlabel.nii). The file must be in fsaverage5 space (10,242 vertices per hemisphere).

Usage

create_cortical_from_cifti(
  cifti_file,
  atlas_name = NULL,
  output_dir = NULL,
  hemisphere = c("rh", "lh"),
  views = c("lateral", "medial", "superior", "inferior"),
  tolerance = NULL,
  smooth_refinements = NULL,
  cleanup = NULL,
  verbose = get_verbose(),
  skip_existing = NULL
)

Arguments

cifti_file: Path to a .dlabel.nii CIFTI file.
atlas_name: Name for the atlas. If NULL, derived from the input filename.
output_dir: Directory to store intermediate files (screenshots, masks, contours). Defaults to tempdir().
hemisphere: Which hemispheres to include: "lh", "rh", or both.
views: Which views to include: "lateral", "medial", "superior", "inferior".
tolerance: Simplification tolerance for 2D polygons. Higher values produce simpler shapes with fewer vertices (typical range: 0.1–2). Passed to sf::st_simplify(). If not specified, uses options("ggseg.extra.tolerance") or the GGSEG_EXTRA_TOLERANCE environment variable. Default is 1.
smooth_refinements: Number of Chaikin corner-cutting refinements to apply to 2D polygons. Higher values produce smoother region boundaries (typical range: 0–3). 0 disables smoothing. If not specified, uses options("ggseg.extra.smooth_refinements") or the GGSEG_EXTRA_SMOOTH_REFINEMENTS environment variable. Default is 2.
cleanup: Remove intermediate files after atlas creation. If not specified, uses options("ggseg.extra.cleanup") or the GGSEG_EXTRA_CLEANUP environment variable. Default is TRUE.
verbose: Verbosity level: 0 (silent), 1 (standard progress, default), or 2 (debug, includes FreeSurfer output). Logical values are accepted (TRUE = 1, FALSE = 0). If not specified, uses the value from options("ggseg.extra.verbose") or the GGSEG_EXTRA_VERBOSE environment variable.
skip_existing: Skip generating output files that already exist, allowing interrupted atlas creation to resume. If not specified, uses options("ggseg.extra.skip_existing") or the GGSEG_EXTRA_SKIP_EXISTING environment variable. Default is TRUE.

Value

A ggseg_atlas object.

Examples

if (FALSE) { # \dontrun{
atlas <- create_cortical_from_cifti(
  cifti_file = "parcellation.dlabel.nii"
)
} # }