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. 2015 Nov 4;15:844. doi: 10.1186/s12885-015-1867-8

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© Bird et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Example of inter-observer variability in contouring GTVs based on CT, MR, CT-MR and of auto-segmented contour based on PET for a patient with a T2 N2b poorly differentiated squamous cell carcinoma of the right tonsil. Contours shown are: radiation oncologist 1 red, radiation oncologist 2 yellow, radiation oncologist 3 orange, radiologist 1 green, radiologist 2 purple, PET contour blue