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. 2017 Aug 8;18(5):178–183. doi: 10.1002/acm2.12147

Figure 2.

Figure 2

A setup of (a) the dosimetry tool attached to a collimator on a Varian Clinac® 6EX (b). The illustration of obscuring of the focal spot by the jaw and the geometric relationship of the lengths of similar triangles (schematic and not to scale).