Algorithm for solving the equation of radiative transfer in the frequency domain.

@article{Ren2004AlgorithmFS,
  title={Algorithm for solving the equation of radiative transfer in the frequency domain.},
  author={Kui Ren and Gassan Abdoulaev and Guillaume Bal and Andreas H. Hielscher},
  journal={Optics letters},
  year={2004},
  volume={29 6},
  pages={
          578-80
        }
}
We present an algorithm that provides a frequency-domain solution of the equation of radiative transfer (ERT) for heterogeneous media of arbitrary shape. Although an ERT is more accurate than a diffusion equation, no ERT code for the widely employed frequency-domain case has been developed to date. In this work the ERT is discretized by a combination of discrete-ordinate and finite-volume methods. Two numerical simulations are presented. 

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