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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 weighted fits compared to those carried out with unweighted fits: (a) including the Al plug (Tests 19, 15 and 17 vs. Tests 20, 16 and 18, respectively), (b) excluding the Al plug (Tests 13, 1 and 11 vs. Tests 14, 10 and 12, respectively); and for calibrations carried out including the Al plug compared to those excluding it: (c) weighted fits (Tests 14, 10 and 12 vs. Tests 20, 16 and 18, respectively), (d) unweighted fits (Tests 13, 1 and 11 vs. Tests 19, 15 and 17, respectively). The results of using either the combined set of Gammex and CIRS plugs or one or other set alone are shown, as are the results of using either two‐ or three‐parameter fits (solid and dashed lines, respectively).