Practical cone-beam algorithm

@article{Feldkamp1984PracticalCA,
  title={Practical cone-beam algorithm},
  author={Lee A. Feldkamp and Lloyd Craig Davis and James W. Kress},
  journal={Journal of The Optical Society of America A-optics Image Science and Vision},
  year={1984},
  volume={1},
  pages={612-619}
}
A convolution-backprojection formula is deduced for direct reconstruction of a three-dimensional density function from a set of two-dimensional projections. The formula is approximate but has useful properties, including errors that are relatively small in many practical instances and a form that leads to convenient computation. It reduces to the standard fan-beam formula in the plane that is perpendicular to the axis of rotation and contains the point source. The algorithm is applied to a… 

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