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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: Phys Med Biol. 2009 Aug 18;54(17):5341–5357. doi: 10.1088/0031-9155/54/17/017

Figure 3.

Figure 3

The commissioning jig, 6 × 6 × 8 cm cubed plastic water phantom assembly and related equipment. Using this system, EBT films are sandwiched between layers of 5 mm thick, kV-equivalent plastic water and are rigidly indexed to the beam axis. A custom film hole puncher (c) was constructed for this purpose. Note that the indicated bottom plate of the jig can slide along the vertical beam axis, its position being determined by the configuration of the spacers (a and b). This allows that the source-to-surface distance (SSD) be varied.