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. 2021 Jan 12;11:541. doi: 10.1038/s41598-020-80652-z

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© The Author(s) 2021

Open Access This 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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SPI images of tablets. (A) 2D SPI images of (a,b,e,f) a single tablet and of (c,d,g,h) a periodic sample of tablets at the FOV equal to: (c–d) triple and (e–h) single unit cell size. (b,f) The single tablet sample does not produce a detectable signal. (a,e) With sufficient averaging the signal becomes comparable to that of (c,g) the periodic sample without averaging. (d,h) After a day, this signal is lower due to moisture loss. (B) 3D SPI images of the periodic tablet sample freshly moistened and after a day.