77 lines
3.3 KiB
Markdown
77 lines
3.3 KiB
Markdown
# NIfTI-1 Test Data Sets
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Valid test data sets of 3D (structural) and 4D (functional) images in NIfTI-1 format.
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This information was taken from https://nifti.nimh.nih.gov/nifti-1/data
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Note: The software `nifti_tool` is part of the reference implementation.
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## 3D Structural Images
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### Labeled LR Standard (MNI152) Images in Nifti Format
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Two images in nifti1 format (dual file or single file) in MNI152 space, with
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appropriate sform and qform (gzipped for convenient transfer)
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- `avg152T1_LR_nifti.hdr.gz` and `avg152T1_LR_nifti.img.gz` or [avg152T1_LR_nifti.nii.gz](avg152T1_LR_nifti.nii.gz)
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- dimensions: 91 x 109 x 91 ; 2mm x 2mm x 2mm
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- text header dump by `nifti_tool`: [avg152T1_LR_nifti_ntool.txt](avg152T1_LR_nifti_ntool.txt)
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- `avg152T1_RL_nifti.hdr.gz` and `avg152T1_RL_nifti.img.gz` or [avg152T1_RL_nifti.nii.gz](avg152T1_RL_nifti.nii.gz)
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- dimensions: 91 x 109 x 91 ; 2mm x 2mm x 2mm
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- text header dump by `nifti_tool`: [avg152T1_RL_nifti_ntool.txt](avg152T1_RL_nifti_ntool.txt)
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The first image (LR) is stored in radiological convention. The second image
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(RL) is stored in neurological convention. Any nifti-1 compliant viewing
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software should display these images identically.
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### Statistic Image
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A single z-statistic image in gzipped single file nifti-1 form
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- [zstat1.nii.gz](zstat1.nii.gz)
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- dimensions: 64 x 64 x 21 ; 4mm x 4mm x 6mm
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- text header dump by `nifti_tool`: [zstat1_ntool.txt](zstat1_ntool.txt)
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## 4D Functional Images
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### Simple Time-series or multi-volume image
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A simple image time-series in gzipped single file nifti-1 form.
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- [filtered_func_data.nii.gz]([filtered_func_data.nii.gz)
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- dimensions: 64 x 64 x 21 x 180 ; 4mm x 4mm x 6mm x 3 sec
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- text header dump by `nifti_tool`: [filtered_func_data_ntool.txt](filtered_func_data_ntool.txt)
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### Sternberg Item Recognition Paradigm (SIRP) fMRI Study + XML Extension Data
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- `sirp_fmri_study_ver4.tar.gz`
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- text header dump by `nifti_tool`: [newsirp_final_XML_ntool.txt](newsirp_final_XML_ntool.txt)
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147 volumes of a SIRP study in a single NIfTI `*.nii` image file with `sform`
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and `qform` properly set and an extension space consisting of the XCEDE XML
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formatted E-prime task data, Quickmood assessments acquired before and after
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the scanning session, and the image acquisition parameters. The first volume of
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the series contains an "L" superimposed on the left side of the volume to help
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in testing implementations that read the qforms. Additionally the XML file
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portion is also saved as an independent XML file for easy browsing called
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`103.1.sirp.xml`. Also includes a PDF description of task.
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## Minimal Nifti1 Dataset
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The "minimal" dataset `minimal.hdr.gz`, `minimal.img.gz` and
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[minimal.nii.gz](minimal.nii.gz) is provided as an example and test dataset. It
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contains close to the minimum number of header fields that need to be set in
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NIfTI1 dataset and have it still conform to the NIfTI1 standard. It is not the
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very minimum, because one could create 1 dimensional image. But, we wanted to
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provide a minimal dataset that could be loaded and viewed as an image.
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`minimal.img` is a simple ramp image, increasing from 0-63 along the Y axis.
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See the [NIfTI1 FAQ](https://nifti.nimh.nih.gov/nifti-1/documentation/faq)
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question #4 for an explanation of the minimal fields that must be set in NIfTI1
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datasheet.
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