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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. 2 — Representative example of GTVs delineated on CT, MR, CT-MR by a single radiation oncologist, displayed on an axial CT scan, for a patient with a T1 N2b well differentiated squamous cell carcinoma of the right tonsil. CT GTV red; MR GTV yellow; CT-MR contour orange; PET contour blue