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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 6.

Figure 6

Correspondence of the SARRP commissioning jig z-axis with the physical beam axis, as indicated by the location of the measured beam spot on the registered films as a function of depth. Red and blue data points correspond to the observed beam-spot centroids in x and y, respectively. The film set exposures for (a) and (c) were measured one after the other, whereas (b), for SSD = 38 cm, was measured last and required a change in the configuration of spacers to change the SSD. (See text for further description).