Figure 5.

Transversal relative dose distribution (a) obtained from a film irradiated with 6 dual fields of 9 MeV beam with degrader and added flattening filter, normalized to the dose at 12.2 mm depth along the AP axis (corresponding to ${\mathrm{R}}_{100}$ of the AP field); (b) composite percentage depth dose distribution for the 6 dual fields with the modified Stanford technique (dashed line) and the optimized technique (solid line).