A Fast and Accurate Method for Dose Computations in Electron Radiotherapy
M. Seaid (Durham University, UK)
We propose a fast and accurate numerical solver for the Fokker–Planck approximation of a deterministic transport model for electron radiation in radiotherapy. The model accounts for the space, energy, and directional-dependent electron flux density. The numerical method is based on the modified method of characteristics and eliminates the CFL condition required for most explicit Eulerian methods. Results obtained from our solver are compared to Monte Carlo values for a variety of source spectra and field sizes. The agreement for our results in the beam is usually within the Monte Carlo uncertainties. It is concluded that the proposed method is a rigorous, first-principles approach that could provide a superior alternative to Monte Carlo calculations for some types of problems.