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. 2020 Apr 8;4:8. doi: 10.1038/s41698-020-0115-0

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — The top two images show the position of the rectal tumor in rest. In the lower four images, the rectum is moved to the right and left. Note that the green segmentation area follows the real-time tumor position in the navigation images on the right, while the CT scan on the left (still) shows the original position of the tumor. Visible segmentation: bones (white), arteries (red), veins (blue), ureters/kidneys (yellow), and tumor (green).