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. 2019 Sep 16;9:13332. doi: 10.1038/s41598-019-49899-z

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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MuCLS X-ray projection images filtered and unfiltered CTs at projection angles 0°, 90° and 180°. The kidney stone is indicated by a red arrow. In the unfiltered projection images, the iodine filled blood vessels are clearly visible together with the kidney stone. In the filtered projection images, the X-ray attenuation of the iodine contrast agent is reduced, yet still the differentiation of iodine and the kidney stone is difficult. The gray scales of the projection images show the relative transmission of the X-ray beam.