The knowledge ofclinical beams is essential for dosimetry and for the development of accurate dose calculation algorithms in clinical treatment planning systems (TPS). Monte Carlo simulation is the most advanced and accurate technique for radiotherapy treatment planning, being based on the actual radiation transport physics. In an earlier study [16]a Monte Carlo TPS was implemented in the clinic and the dose distribution is compared with a commercial TPS. It was found that the conventional dose calculation algorithm in the commercial TPS did not accurately predict the dose distributions in and near inhomogeneities due to incorrect modelling of electron transport under charged particle dis-equilibrium. Significant differences (> 5 % in dose and > 5 mm shift in isodose lines) were found between Monte Carlo calculations and the analytical calculations implemented in the commercial systems.
đang được dịch, vui lòng đợi..
