NCI Imaging Data Commons (IDC) is a cloud-based environment containing publicly available cancer imaging data co-located with analysis and exploration tools and resources. IDC is a node within the broader NCI Cancer Research Data Commons (CRDC) infrastructure that provides secure access to a large, comprehensive, and expanding collection of cancer research data.


  • >65 TB of data: IDC contains radiology, brightfield (H&E) and fluorescence slide microscopy images, along with image-derived data (annotations, segmentations, quantitative measurements) and accompanying clinical data

  • free: all of the data in IDC is publicly available: no registration, no access requests

  • commercial-friendly: >95% of the data in IDC is covered by the permissive CC-BY license, which allows commercial reuse (small subset of data is covered by the CC-NC license); each file in IDC is tagged with the license to make it easier for you to understand and follow the rules

  • cloud-based: all of the data in IDC is available from both Google and AWS public buckets: fast and free to download, no out-of-cloud egress fees

  • harmonized: all of the images and image-derived data in IDC is harmonized into standard DICOM representation


IDC is as much about data as it is about what you can do with the data! We maintain and actively develop a variety of tools that are designed to help you efficiently navigate, access and analyze IDC data:

  • exploration: start with the IDC Portal to get an idea of the data available

  • visualization: examine images and image-derived annotations and analysis results from the convenience of your browser using integrated OHIF, VolView and Slim open source viewers

  • programmatic access: use idc-index python package we provide to perform search, download and other operations programmatically

  • cohort building: use rich and extensive metadata to build subsets of data programmatically using idc-index or BigQuery SQL

  • download: use your favorite S3 API client or idc-index, to efficiently fetch any of the IDC files from our public buckets

  • analysis: conveniently access IDC files and metadata from the tools that are cloud-native, such as Google Colab or Looker; fetch IDC data directly into 3D Slicer using SlicerIDCBrowser extension

The overview of IDC is available in this open access publication. If you use IDC, please acknowledge us by citing it!

Fedorov, A., Longabaugh, W. J. R., Pot, D., Clunie, D. A., Pieper, S. D., Gibbs, D. L., Bridge, C., Herrmann, M. D., Homeyer, A., Lewis, R., Aerts, H. J. W., Krishnaswamy, D., Thiriveedhi, V. K., Ciausu, C., Schacherer, D. P., Bontempi, D., Pihl, T., Wagner, U., Farahani, K., Kim, E. & Kikinis, R. National Cancer Institute Imaging Data Commons: Toward Transparency, Reproducibility, and Scalability in Imaging Artificial Intelligence. RadioGraphics (2023). https://doi.org/10.1148/rg.230180

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