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|subcat=Health and Medicine
|subcat=Health and Medicine
|extensions={{ext|nii}}, {{ext|nii.gz}}
|extensions={{ext|nii}}, {{ext|nii.gz}}
:''For the animated image format, see [[Naïve Image Formats]].''
== General description ==
== General description ==

Latest revision as of 21:48, 26 December 2019

File Format
Name NII
Extension(s) .nii, .nii.gz
PRONOM fmt/1094
For the animated image format, see Naïve Image Formats.

[edit] General description

NII (or NIfTI) files are probably the most commonly-used format for multi-dimensional neuroimaging data as of this writing (late 2012). NIfTI is a raster format, with files generally containing at least 3-dimensional data: voxels, or pixels with a width, height, and depth. NIfTI files can be up to 7-dimensional: the first four dimensions are defined as 3 spatial dimensions and time, with the other dimensions used for "other stuff" -- though the time dimension is often to encode something other than time.

Most packages also support reading gzip-compressed NIfTI files, which should have the extension .NII.gz.

The format is extensively supported and documented by the NIH.

[edit] Software

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