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. 2019 Dec 26;6:29. doi: 10.1186/s40658-019-0268-5

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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. 1 — The phantoms used to determine the RC. Upper phantom: NEMA IEC body phantom. Lower two phantoms: custom-made phantoms reflecting a larger body mass index (BMI, kg/m²) of patients. Note that the lower two phantoms are depicted without spheres inset