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. 2014 May 8;15(3):202–220. doi: 10.1120/jacmp.v15i3.4721

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© 2014 The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Fractional differences in relative proton stopping power as a function of HU for stoichiometric calibrations carried out with three‐parameter fits compared to those carried out with two‐parameter fits. The results of using either the combined set of Gammex and CIRS plugs or one or other set alone are shown: (a) weighted fits, including also the Al plug (Tests 20, 16 and 18: a vs. b), (b) unweighted fits, including the Al plug (Tests 19, 15 and 17: a vs. b), (c) weighted fits, excluding the Al plug (Tests 14, 10 and 12: a vs. b), and (d) unweighted fits, excluding the Al plug (Tests 13, 1 and 11: a vs. b). “a vs. b” implies a comparison between data analyses performed for a particular test with either a three‐parameter fit (type “a” test, Table 2) or a two‐parameter fit (type “b” test, Table 2).