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. 2019 Dec 10;6:22. doi: 10.1186/s40658-019-0264-9

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 5 — Qualitative evaluation of the transaxial images of the NEMA phantom of TOF-OSEM (3 iterations, 16 subsets, post-filter 5.0 mm and PSF) and BSREM with β = 750 (including TOF and PSF). Contrast ratios of 8:1, 6:1, 4:1, and 2:1 are shown in rows and acquisition times (1.0, 2.5, and 20 min) in column. Background level is 5.3 kBq/ml in all cases