Physics Bucharest 2017

TYPES OF DOSE CALCULATION • Central axis models • PDD, TMR, PSF etc. • Semi-empirical models • Based on tables of measured beam data • Bentley-Milan algorithm • Pencil-beam algorithms Model based • 2D convolution • Convolution algorithms Model based • 3D convolution • Monte Carlo simulation • Limitations in accuracy vs speed Can be hand calculations for point doses Used on all 2D planning systems. Often used for dose checking Popular for IMRT optimisation Main algorithm today

Boltzmann transport equation