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. 2021 Jul 17;8:52. doi: 10.1186/s40658-021-00400-8

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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. 4 — Average CRC_max (left), CRC_mean (middle) and CRC_peak (right) for all 6 Gallium-68 (blue curve) and the 12 Fluorine-18 (red curve) acquisitions reconstructed with standard OSEM. The error bars represent the standard deviation between sites. Significant difference was noticed for the 13-mm sphere at the 5% significance level for CRC_max and CRC_peak