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. 2020 Nov 19;10:20166. doi: 10.1038/s41598-020-76754-3

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© The Author(s) 2020

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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left panel ultrasound tomography (attenuation) image of cross-section of bovine bone. Right panel shows the optical image of the cross-section sawed froma bovine femur. This shows evidence that the trabecular part of the bone is visible in attenuation images due to the prevalence of edges. Note the attenuation is almost zero in the cortical part of the bone. The energy loss at the interface is interpreted as attenuation making the edge visible.