The direct use of CT numbers in radiotherapy dosage calculations for inhomogeneous media.

@article{Parker1979TheDU,
  title={The direct use of CT numbers in radiotherapy dosage calculations for inhomogeneous media.},
  author={Robert P. Parker and P A Hobday and K. J. Cassell},
  journal={Physics in medicine and biology},
  year={1979},
  volume={24 4},
  pages={802-9}
}
Techniques by which the quantitative anatomical data inherent in a CT scan can be directly used in treatment planning are described. The correction algorithms used in the RAD-8 system, based on an effective path length, have been extended to a pixel-by-pixel approach. By calibrating the X-ray transmission CT scanner in terms of electron densities (electron cm-3) inhomogeneity corrections may be made automatically. 

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