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