Implementation of an analytical solution to lateral dose prediction in a proton therapy treatment planning system

This work aims to present a flexible computational model for the calculation of the lateral deflection of a pencil proton beam, and the preliminary results of its implementation in a Treatment Planning System (TPS) instead of the currently used Double Gaussian approximation (DGA) in water. First evidences show that the model has better accuracy with fast computation time in water; it is reliable for any depth and for every kind of media and mixture, since energy loss effects by the primary process are fully taken into account.