https://www.kaggle.com/code/datark1/what-are-dcm-and-nii-files-and-how-to-read-them

• NII files are typical for MRI data

• This library can open them: https://nipy.org/nibabel/gettingstarted.html

  • Read and write access to common neuroimaging file formats, including: ANALYZE (plain, SPM99, SPM2 and later), GIFTI, NIfTI1, NIfTI2, CIFTI-2, MINC1, MINC2, AFNI BRIK/HEAD, ECAT and Philips PAR/REC. In addition, NiBabel also supports FreeSurfer’s MGH, geometry, annotation and morphometry files, and provides some limited support for DICOM.

• Cool viewers exist

  • online
    • https://socr.umich.edu/HTML5/BrainViewer/
      • for annotated files, 3d opacity+threshold help seeing the annotated areas VS raw image
      • drop multiple files (e.g. raw + ground truth) to have them as multiple layers
    • https://brainbrowser.cbrain.mcgill.ca/volume-viewer
      • can do 4d (3d+time) viewing! E.g. beating heart from ACDC dataset
    • https://www.fmrib.ox.ac.uk/ukbiobank/group_means/index.html may or may not be papaya
    • https://niivue.github.io/niivue-ui/ neat w/ probe1.nii.gz
    • https://viewer.imaging.datacommons.cancer.gov/viewer/1.3.6.1.4.1.14519.5.2.1.6279.6001.224985459390356936417021464571?seriesInstanceUID=1.2.276.0.7230010.3.1.3.0.57823.1553343864.578877,1.3.6.1.4.1.14519.5.2.1.6279.6001.273525289046256012743471155680 a cool viewerKKJJjjkk

• list of others: https://docs.facebase.org/docs/nifti-files/

• https://github.com/niivue/niivue even better list of others

• Other

  • Maternal Brain Project - OpenNeuro OpenNeuro has many datasets