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The Cancer Imaging Archive

CT-ORG | CT volumes with multiple organ segmentations

DOI: 10.7937/tcia.2019.tt7f4v7o | Data Citation Required | Image Collection

Location Species Subjects Data Types Cancer Types Size Supporting Data Status Updated
Bladder, Bone, Brain, Kidney, Liver, and Lung Human 140 Segmentations, CT Liver 16.9GB Software/Source Code Public, Complete 2020/01/09


This dataset consists of 140 computed tomography (CT) scans, each with five organs labeled in 3D: lung, bones, liver, kidneys and bladder. The brain is also labeled on the minority of scans which show it.

Patients were included based on the presence of lesions in one or more of the labeled organs. Most of the images exhibit liver lesions, both benign and malignant. Some also exhibit metastatic disease in other organs such as bones and lungs.

The images come from a wide variety of sources, including abdominal and full-body; contrast and non-contrast; low-dose and high-dose CT scans. 131 images are dedicated CTs, the remaining 9 are the CT component taken from PET-CT exams. This makes the dataset ideal for training and evaluating organ segmentation algorithms, which ought to perform well in a wide variety of imaging conditions.

The dataset includes large and easily-located organs such as the lungs, as well as small and difficult ones like the bladder. We hope the dataset will enable widespread adoption of multi-class organ segmentation, as well as competitive benchmarking of algorithms for it.

The data are divided into a testing set of 21 CT scans, and a training set of the remaining 119. For the training set, the lungs and bones were automatically segmented by morphological image processing. For the testing set, the lungs and bones were segmented manually. All other organs were segmented manually in both the training and testing sets. Manual segmentations were done with ITK-SNAP (, starting with semi-automatic active contour segmentation followed by manual clean-up. The source code for the morphological algorithms is available at:

Many images were borrowed from the Liver Tumor Segmentation (LiTS) challenge, which the organizers have generously allowed us to distribute. For more information, see the following website and paper:
- (redirects to )
- Arxiv [1901.04056] The Liver Tumor Segmentation Benchmark (LiTS) (

Data Access

Version 1: Updated

Added new subjects.

Title Data Type Format Access Points Subjects Studies Series Images License
Images Segmentations, CT NIFTI
Download requires IBM-Aspera-Connect plugin
140 140 280 280 CC BY 3.0
Data description TXT CC BY 3.0

Additional Resources for this Dataset

The following external resources have been made available by the data submitters.  These are not hosted or supported by TCIA, but may be useful to researchers utilizing this collection.

Citations & Data Usage Policy

Data Citation Required: Users must abide by the TCIA Data Usage Policy and Restrictions. Attribution must include the following citation, including the Digital Object Identifier:

Data Citation

Rister, B., Shivakumar, K., Nobashi, T., & Rubin, D. L. (2019). CT-ORG: A Dataset of CT Volumes With Multiple Organ Segmentations (Version 1) [dataset]. The Cancer Imaging Archive.  DOI: 10.7937/tcia.2019.tt7f4v7o

Detailed Description

  • CTs and segmentations are saved in Nifti-1 (.nii.gz) format. Each Nifti-1 file stores the entire CT volume in Hounsfield units. Segmentations are in patient-native space (no change in registration).
  • Note: several volumes appear to be left-right flipped relative to others. Please contact the authors or if this causes confusion.
  • The source code for the morphological algorithm (bone and lung segmentation) is available here:
  • Please explore README.txt that is also bundled in the package.


  • This work was supported in part by grants from the National Cancer Institute, National Institutes of Health, 1U01CA190214 and 1U01CA187947.

Other Publications Using this Data

TCIA maintains a list of publications which leverage TCIA data. If you have a manuscript you’d like to add please contact TCIA’s Helpdesk.

Publication Citation

Rister, B., Yi, D., Shivakumar, K., Nobashi, T., & Rubin, D.L. CT organ segmentation using GPU data augmentation, unsupervised labels and IOU loss

Publication Citation

Bilic, P., Christ, P., Li, H. B., Vorontsov, E., Ben-Cohen, A., Kaissis, G., … Menze, B. (2023). The Liver Tumor Segmentation Benchmark (LiTS)   , 

TCIA Citation

Clark, K., Vendt, B., Smith, K., Freymann, J., Kirby, J., Koppel, P., Moore, S., Phillips, S., Maffitt, D., Pringle, M., Tarbox, L., & Prior, F. (2013). The Cancer Imaging Archive (TCIA): Maintaining and Operating a Public Information Repository. In Journal of Digital Imaging (Vol. 26, Issue 6, pp. 1045–1057). Springer Science and Business Media LLC.