Lateral dose profiles for the optimized plans as calculated by Pencil Beam, Collapsed Cone, and Monte Carlo and measured by film dosimetry. Normalization was performed to the isocenter for the Collapsed Cone. Weighting of the peripheral segments compared to the large segment: a) 1/4 b) 1/8 c) 1/10 d) only one peripheral segment per beam with weight 1/10. The comparison validates the increasing accuracy from PB to CC to MC. MC calculation and film measurement confirm that the highest homogeneity is achieved for the 1/10 weighting of one peripheral segment per beam.