NUMERICAL-CALCULATION OF ENERGY DEPOSITION BY BROAD HIGH-ENERGY ELECTRON-BEAMS .2. MULTILAYERED GEOMETRY

The phase space time evolution model of Huizenga and Storchi has been modified to handle dose deposition calculations by broad high-energy electron beams in homogeneous non-water media and in a multi-layered geometry. This is a further development aimed at the use of a phase space time evolution model in radiotherapy treatment planning. In the model presented a different approach to the step-size choice and photon energy deposition has been chosen, The results of the numerical depth-dose calculations are in very good agreement with Monte Carlo calculations with the ITS and EGS codes for lighter materials like water and aluminium. For high-Z materials like gold or lead agreement between numerical and Monte Carlo results is also moderately good.