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. 2017 Jun 6;16(6):944–955. doi: 10.1177/1533034617711354

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 12. — Ratio of dose calculated using incorrect thickness (w) to dose calculated with correct thickness (w ± ▵w), from transit images of phantoms of thickness w ± ▵w. In the case of tissue gain/swelling (▵w = +1, A and B), use of planning CT thickness (w) causes dose underestimation. The dose calculation error is largest for thickness changes downstream of the isocenter (dashed) and is larger for 6 MV (A and C) than 15 MV (B and D).