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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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Evaluation of the spatial resolution for the clinical system (red circles), and synchrotron breast CT with smooth (blue squares) and sharp (blue-white triangles) phase-retrieval algorithm. The logarithm of the squared absolute value of the image Fourier transform (on y-axis) is plotted as function of the square of the spatial frequency (on x-axis). The linear fit for each dataset is shown with black lines. The inset displays a zoom at lower spatial frequencies.