# HaN-Seg: The head and neck organ-at-risk CT & MR segmentation dataset

## License
**CC BY-NC-ND 4.0**  
[Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License](https://creativecommons.org/licenses/by-nc-nd/4.0/)

We have obtained special permission from the original dataset authors to release our derivative segmentations on the images.

## Citation
Paper BibTeX:

```bibtex
@article{podobnik2023han,
  title={HaN-Seg: The head and neck organ-at-risk CT and MR segmentation dataset},
  author={Podobnik, Ga{\v{s}}per and Strojan, Primo{\v{z}} and Peterlin, Primo{\v{z}} and Ibragimov, Bulat and Vrtovec, Toma{\v{z}}},
  journal={Medical physics},
  volume={50},
  number={3},
  pages={1917--1927},
  year={2023},
  publisher={Wiley Online Library}
}
```


## Dataset description
HaN-Seg provides anonymized CT and T1-weighted MR scans of 42 head and neck cancer patients acquired for image-guided radiotherapy planning. Each CT scan includes expert-curated binary masks for 30 organs-at-risk (OARs), enabling research on multimodal image analysis and precise radiotherapy planning.

**Challenge homepage**: https://han-seg2023.grand-challenge.org/

**Number of CT volumes**: 42

**Contrast**: Contrast-enhanced

**CT body coverage**: Head and neck

**Does the dataset include any ground truth annotations?**: Yes

**Original GT annotation targets**: (30 OARs) arytenoids, brainstem, carotid artery, cervical esophagus, cochlea, cricopharyngeal inlet, lacrimal gland, larynx—glottis, larynx—supraglottic, lips, mandible, optic chiasm, optic nerve, oral cavity, parotid gland, pituitary gland, spinal cord, submandibular gland, and thyroid

**Number of annotated CT volumes**:42

**Annotator**: Human

**Acquisition centers**: Institute of Oncology Ljubljana, Slovenia

**Pathology/Disease**: All cases represent pathological conditions, predominantly head and neck tumors. Other pathologies may also be present, as the dataset was not systematically screened for them.

**Original dataset download link**: https://zenodo.org/records/7442914#.ZBtfBHbMJaQ

**Original dataset format**: nrrd

## Note
We did not include the original GT annotations for spinal cord from HaN-Seg. Since other datasets in CADS cover a larger field of view where the spinal cord extends below the head-and-neck, we generated our own spinal cord segmentations on Han-Seg images to ensure consistency across CADS.