Analysis of the Dose Drop at the Edge of the Target Area in Heavy Ion Radiotherapy

Figure 1

Comparison of dose decay curves under different beam setup modes. The plans of 4 Gy (RBE) per fraction in the TPS were selected to compare the dose decay curves of different beam setup modes. Multiple heavy ion treatment plans with single beam irradiation, two-beam irradiation in opposite direction, and two-beam orthogonal irradiation under common segmentation conditions were designed in a homogeneous water phantom.