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

Figure 2

Demonstrates how the primary function is affected by parameters and ; the best fitting of parameter and in the PDD of 9 MeV electron beam in (a) and (b). The curve becomes less attenuated in a large as shown at the bottom in (c). The factor represents the spreading factor at any electron energy; it is explicitly a large electron beam that comes with a large as shown in Table 2 and (c). The factor is used to fine-tune the shape of the PDD curve, and it is trending to be smaller in a high electron energy beam.

(a)

(b)

(c)