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. 2018 Apr 26;8:6608. doi: 10.1038/s41598-018-25075-7

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© The Author(s) 2018

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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DPC projections of a phantom illustrating the grating sensitivity. The top row was measured with the vertical grating configuration, the bottom row with tilted gratings. Subfigures (A) and (C) depict the DPC signal of the phantom at 0°. Subfigures (B) and (D) show the same sample at 180° sample rotation with respect to the tomographic axis. The DPC signal of the full phantom shape is represented by subfigure (D). The colored arrows mark typical differences in sensitivity at the same rotational position arising from the different grating orientation. The gray scale of the lateral phase-shift of the interference pattern φ is in the linear range of [−0.4, 0.4].