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. 2020 Feb 14;7:10. doi: 10.1186/s40658-020-0275-6

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© The Author(s). 2020

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. 3 — Schema (a) and pictures (b, c) of cylindrical phantoms used in SPECT acquisitions with capillary sources. The Air-3D phantom is shown in b while the CTDI-10 phantom is shown in c. Starting from the centre, the capillaries were added successively (up to three capillaries per hole)