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. 2019 May 10;9:40. doi: 10.1186/s13550-019-0512-y

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© The Author(s). 2019

Open Access This 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. 3 — Transaxial views through the centre of the spheres in the NEMA phantom when reconstructed using a variety of beta values. a Beta = 1. b Beta = 1000. c Beta = 2000. d Beta = 3000. e Beta = 4000