Figure 3. Composite peripheral dose(PD) distribution of 6 MV X-ray measured at 5 cm depth with 0° and 90° collimator angles from 10 cm x 10 cm field simulated in dynamic multileaf collimation (DMLC) mode using 0.5 cm sweeping gap width, normalized to 100% on the central axis at depth of maximum dose of static open field.