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. 2020 Sep 1;15:211. doi: 10.1186/s13014-020-01650-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — An example of a rectal cancer patient’s PS and BL contours and dose distribution based on different CT scans during treatment. The green, blue, and orange contours represent PTV, PS, and BL, respectively. The innermost and outermost dose lines are 50 Gy and 30 Gy, respectively. Picture Plan, 1 W, 2 W, 3 W, 4 W show the variations of PS and BL’s contours and dose distribution during treatment, picture Field show the radiotherapy field setup