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. 2019 Nov 28;9:17778. doi: 10.1038/s41598-019-54131-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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Bi-dimensional normalized noise power spectra (nNPS) for (a) the clinical BCT system, synchrotron BCT with (b) smooth and (c) sharp phase-retrieval algorithm. Of note, the range of frequency axes in (a) is different from (b,c). The inset on the top-left corner of each image represent the same homogeneous ROI with an area of 20×20 mm². (d) Radial averaged nNPS for the clinical system (dashed red line), and SR breast CT with smooth (dashed blue line) and sharp (solid blue line) phase-retrieval algorithm. Of note, the left y-axis refers to the nNPS of the clinical system, while the right y-axis to the synchrotron breast CT. The shaded region around each line represents one standard deviation uncertainty.