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. 2021 Mar 20;8:29. doi: 10.1186/s40658-021-00373-8

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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. 6 — Differences in a maximum and b mean activity concentration for each kV relative to 120 kV reference in NEMA IQ phantom. Data points also corresponding to ‘CARE kV on’ shown with blue markers. There are 6 data points per kV setting corresponding to VOIs over the 6 spheres with some data points overlapping, particularly at 0.00% difference in measured activity concentration