Computer Simulation of Radiotherapy Dose Distribution in Tissue

3D treatment planning systems in radiotherapy is important to achieve an accurate assessment of all aspects of the dose distribution and requires visualization of dose distribution in an easy and clear way. To perform dose calculations for realistic tissue, the Monte Carlo code must have the ability to deal with CT data. We modified Monte Carlo code DPM (dose planning method) and primarily studied how to build the patient model, make DPM deal with CT voxel and visualize the dose calculation results. The author programmed to realize DPM modeling and conversion into DPM input files. A new neural network algorithm was presented for tissue density calibration. This algorithm had been added to the convention DPM and can fulfil the requirement of heterogeneity correction in clinical radiotherapy. The visualization facility of Matlab was used to visualize dose calculation results. Simulation results show that DPM modified can deal with CT voxels and get dose calculation results in 2D and 3D display