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. 2021 May 27;11:11174. doi: 10.1038/s41598-021-90599-4

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© The Author(s) 2021

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/.

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Res U-net architecture. This net is used to do the ROI segmentation with CT image to get the position of pulmonary. Each box corresponds to a multi-channel feature map. The number of channel shown on top of the box. The bottom right corner shows the meaning of the arrows.