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. 2021 Jul 12;8:50. doi: 10.1186/s40658-021-00398-z

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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. 1 — ¹²⁴I activity concentration in the phantom’s spheres as a function of increasing ¹³¹I activity in the background measured on the PET image reconstructed with the OSEM algorithm with 2 iterations and 16 subsets, TOF information and PSF modeling. The phantom was placed in the middle of the field of view (a) and on the scanner table at the anterior most position, 11.2 cm higher (off-center) (b)