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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: Int J Radiat Oncol Biol Phys. 2008 Aug 1;71(5):1591–1599. doi: 10.1016/j.ijrobp.2008.04.025

Figure 6.

Figure 6

(a) Measured cross-beam profiles at depths in plastic water for a 30 mm × 30 mm beam at a SSD of 33.5 cm, in comparison with the Monte Carlo calculations by the Pinnacle3 research (blue) and EGSnrc (pink) codes respectively. The added filtration was 4 mm Al. (b) and (c) Measured cross-beam profiles for the smallest beams of 1 mm and 0.5 mm diameters formed by “nozzle” collimators, respectively. The added filtrations were 0.5 mm Cu. Note that the beams are shifted from the expected central axis beam path by about 0.5mm. A picture of one of the exposed EBT film is shown in (d).