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. 2023 Oct 16;10:63. doi: 10.1186/s40658-023-00587-y

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© The Author(s) 2023

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 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. 3 — The central transverse slice of NEMA IEC phantom, from left to right, reconstructed by Q.Clear with β values ranging from 100 to 500 at 100-point intervals and OSEM and from top to bottom were filled with a Background activity concentrations of 5.1 KBq/ml and LBR = 2:1, b Background activity concentrations of 4.9 KBq/ml and LBR = 4:1, c Background activity concentrations of 5 KBq/ml and LBR = 8:1