Figure 6.

Measured and MC calculated (BEAMnrc default parameters∕techniques) off-axis dose profiles in a water phantom for the 10×10 and 40×40 cm² field sizes. The calculations were performed with an average fractional uncertainty in the dose [for voxels with dose values greater than 50% of the maximum dose (Ref. ³⁶)] of less than 0.01 (1%). The percentage difference, in the central region of the field and at different depths, between measured and a selection of MC calculated off-axis dose profiles is also shown.