Energy Modulated Photon Radiotherapy: A Monte Carlo Feasibility Study

Figure 2

Diagram of energy selector correlation coefficient (CC) model. The PDD curves for high and low energy photon beams were shown with solid and dotted lines. A spherical tumor model was located and target entrance and exit points (points 2 and 3) were marked by the arrows. In a real patient, the beam energy was determined by looking up the energy table for a certain effective path length and tumor size (inset).