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. 2019 Oct 22;19:81. doi: 10.1186/s12880-019-0377-6

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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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Recovery coefficients for two scanners across various sphere diameters in the phantom with a sphere-to-background activity ratio of 4:1. Scanning acquisition and image reconstruction parameters identical to those used for a clinical patient. Results based on the mean activity concentration achieved from regions of interest drawn on the CT image then copied to the PET image