The Study of Field Equivalence Determined by the Modeled Percentage Depth Dose in Electron Beam Radiation Therapy

Figure 5

This figure shows the depth dose curves move toward the left significantly when the field size is reduced to less than 4.9 cm in this figure. Thus, the depth dose distribution for small fields is field size-dependent, while for the field that was required for lateral scatter equilibrium (LSE), it is independent of field size.