nrrdinfo
Description
Examples
Read Metadata from NRRD File
Read the metadata from an NRRD format file. The file is part of a data set containing the 3-D CT and MRI scans from The Retrospective Image Registration Evaluation (RIRE) Dataset, converted to the NRRD file format. The original data set was provided by Dr. Michael Fitzpatrick. For more information, see the RIRE Project homepage. The size of the entire data set is approximately 35 MB. Download the data set from the MathWorks® website, then unzip the folder.
zipFile = matlab.internal.examples.downloadSupportFile("medical", ... "MedicalRegistrationNRRDdata.zip"); filepath = fileparts(zipFile); unzip(zipFile,filepath)
Specify the name of the NRRD file to read.
filename = fullfile(filepath,"supportfilesNRRD","Patient007CT.nrrd");
Read the metadata from filename
.
info = nrrdinfo(filename);
The ImageSize
metadata field contains the image volume size, in pixels.
info.ImageSize
ans = 1×3
512 512 28
The PixelDimensions
metadata field contains the voxel size in each dimension, in real world units such as millimeters.
info.PixelDimensions
ans = 1×3
0.6536 0.6536 4.0000
The SpatialMapping
metadata field contains an affinetform3d
object that defines the transformation between the intrinsic and patient coordinate systems for the volume.
info.SpatialMapping
ans = affinetform3d with properties: Dimensionality: 3 A: [4×4 double]
The RawAttributes
metadata field contains the raw metadata extracted from the NRRD header information.
info.RawAttributes
ans = struct with fields:
dimension: '3'
sizes: '512 512 28 '
type: 'float'
encoding: 'raw'
endian: 'little'
spacedimension: '3'
spaceorigin: '(1.653595, 1.653595, 5.000000)'
spacedirections: '(0.653595,0.000000,0.000000) (0.000000,0.653595,0.000000) (0.000000,0.000000,4.000000)'
Input Arguments
filename
— Name of NRRD file
string scalar | character vector
Name of the NRRD file, specified as a string scalar or a character vector. The file
must contain a valid NRRD file header. The nrrdinfo
function
supports NRRD files containing header and image data (.nrrd
) as well
as detached header files (.nhdr
). Specify
filename
as the absolute path to the file, a relative path from
the current directory, or a relative path from a directory on the MATLAB® path.
Data Types: char
| string
Output Arguments
info
— NRRD metadata
structure
NRRD metadata, returned as a structure.
Version History
Introduced in R2022b
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