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. 2021 Aug 21;11:79. doi: 10.1186/s13550-021-00809-3

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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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Fig. 2 — Robustness studies. The influence of delineation variability or image was investigated using either a pair of scans for each patient as it is the case for the PET/CT/PET/MR and motion comparison, or different methods of defining the regions of interest (ROI), as applied for the delineation study. Radiomics calculation was performed on each individual ROI. Robust features were determined using the intraclass correlation coefficient (ICC)