nrrd.parse.header: Parse the header lines of a NRRD file.

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

Parse the header lines of a NRRD file.

Description

Splits the header lines into an NRRD magic line and a named list of typed field values. Field names are normalized for lookup (see nrrd.field.key), the original spelling is kept in the result. A field may be written as 'name: value' or as 'name:=value', the latter meaning that the value is a string, which is how the tools that write custom fields (e.g. the DWI metadata, or pynrrd) store them. The special 'data file: LIST' mode is handled as well: the lines that follow it, up to the end of the header, are the names of the data files.

Usage

nrrd.parse.header(lines, filepath = "")

Arguments

lines	character vector, the header lines, see nrrd.read.header.lines.
filepath	character string, path to the file, used in error messages.

Value

named list with entries magic (character string), fields (named list, keyed by the normalized field name), field_names (named character vector, the original spelling per key) and data_file_names (character vector, the file names of the LIST mode, or NULL).

freesurferformats documentation built on Sept. 25, 2026, 1:07 a.m.