R50 as a beam quality specifier for selecting stopping-power ratios and reference depths for electron dosimetry.

@article{Burns1996R50AA,
  title={R50 as a beam quality specifier for selecting stopping-power ratios and reference depths for electron dosimetry.},
  author={Duncan Thorburn Burns and George X. Ding and D. W. O. Rogers},
  journal={Medical physics},
  year={1996},
  volume={23 3},
  pages={383-8}
}
For electron beam reference dosimetry in radiotherapy, it is shown that by choosing the reference depth as dref = 0.6R(50)-0.1 cm, where R50 is the half-value depth in centimeters, the Spencer-Attix water-to-air stopping-power ratio at dref is given by (Llp)airw = 1.2534 - 0.1487 (R50)0.2144. This is derived from data for (Llp)airw obtained from realistic Monte Carlo simulations for 24 clinical beams. The rms deviation of this expression from the Monte Carlo calculations is 0.16%, with a… CONTINUE READING

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