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. 2020 Jan 6;20:21. doi: 10.1186/s12885-019-6505-4

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© The Author(s). 2020

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. 3 — a Initial radiotherapy plan: axial image of dose distribution (an isodose line of 100% indicates 2 Gy per fraction); b initial radiotherapy plan: irradiation field of gantry angle 0°; c initial radiotherapy plan: irradiation field of gantry angle 315°; d adaptive radiotherapy plan: axial image of dose distribution showing target coverage as ensured by adaptive radiotherapy reflecting the geometrical change (iso-dose line of 100% indicates 2 Gy per fraction); e adaptive radiotherapy plan: irradiation field of gantry angle 0°; f adaptive radiotherapy plan: irradiation field of gantry angle 315°