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Volume 19, Number 1, 2014

Biological effects and equivalent doses in radiotherapy: A software solution

Cyril Voyant, Daniel Julian, Rudy Roustit, Katia Biffi, Céline Lantieri



The limits of TDF (time, dose, and fractionation) and linear quadratic models have been known for a long time. Medical physicists and physicians are required to provide fast and reliable interpretations regarding delivered doses or any future prescriptions relating to treatment changes.


We, therefore, propose a calculation interface under the GNU license to be used for equivalent doses, biological doses, and normal tumor complication probability (Lyman model).

Materials and methods

The methodology used draws from several sources: the linear-quadratic-linear model of Astrahan, the repopulation effects of Dale, and the prediction of multi-fractionated treatments of Thames.

Results and conclusions

The results are obtained from an algorithm that minimizes an ad-hoc cost function, and then compared to an equivalent dose computed using standard calculators in seven French radiotherapy centers.

Signature: Rep Pract Oncol Radiother, 2014; 19(1) : 47-55

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