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. 2021 Sep 5;7(9):178. doi: 10.3390/jimaging7090178

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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CNR for the ROI with the negative DPC signal, marked in Figure 2a. The STD and contrast values are given in radian. The plot in the last row indicates which reference images were used for deriving the values in the respective column. The black markers indicate the values if only one reference image is used. The red and blue markers show the results for the RTA and ATR method, respectively. For combinations 9 and 12, the ATR method results in images with high standard deviation and low contrast and CNR, which are not within the range of the axis. The values in the colored columns are used for a detailed investigation.