These masks are generated using the model from this paper:
Lung Segmentation from Chest X-rays using Variational Data Imputation Raghavendra Selvan, Erik B. Dam, Sofus Rischel, Kaining Sheng, Mads Nielsen, Akshay Pai https://arxiv.org/abs/2005.10052
Source code here: https://github.com/raghavian/lungVAE
@article{raghav2020lungVAE,
title={Lung Segmentation from Chest X-rays using Variational Data Imputation},
author={Raghavendra Selvan et al.},
journal={arXiv preprint arXiv:2020.2005.10052,
year={2020}}}