@inproceedings{chen2007automatic,
  title={Automatic intensity-based 3D-to-2D registration of CT volume and dual-energy digital radiography for the detection of cardiac calcification},
  author={Chen, Xiang and Gilkeson, Robert and Fei, Baowei},
  booktitle={Medical Imaging 2007: Image Processing},
  volume={6512},
  pages={65120A},
  year={2007},
  organization={International Society for Optics and Photonics}
}