J Med Phys Close
 

Figure 2: Comparison of depth dose distribution of rectangular field 7 × 3 cm and equivalent circular fi eld R = 1.9 cm and equivalent square field 3.5 × 3.5 cm at 15 MeV

Figure 2: Comparison of depth dose distribution of rectangular field 7 × 3 cm and equivalent circular fi eld R = 1.9 cm and equivalent square field 3.5 × 3.5 cm at 15 MeV