CT images were taken from Head-Neck-PET-CT dataset (https://wiki.cancerimagingarchive.net/display/Public/Head-Neck-PET-CT) 
MR images were obtained from LGG-1p19qDeletion dataset (https://wiki.cancerimagingarchive.net/display/Public/LGG-1p19qDeletion). 
Both original datasets are distributed under Creative Commons 3.0 License (https://creativecommons.org/licenses/by/3.0/).
For both modalities there was chosen one area of interest: from superciliary arches to lower jaw. Images were cropped accordingly.
If you are using this dataset, please consider citing our paper: 

@article{bashkirova2018unsupervised,
  title={Unsupervised video-to-video translation},
  author={Bashkirova, Dina and Usman, Ben and Saenko, Kate},
  journal={arXiv preprint arXiv:1806.03698},
  year={2018}
}