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. 2022 Oct 8;13:163. doi: 10.1186/s13244-022-01300-w

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© The Author(s) 2022

Open AccessThis 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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Fig. 4 — CT images from a 57-year-old male patient with a clinically suspected renal calculus. A left renal calyceal calculus 1.6 mm in the diameter could be seen on the ULD-HIR (b) image but not on the LD-HIR (a) or ULD-DLR (c) images. With LD-HIR imaging used as the gold standard, the stone was a false positive. LD-HIR means low-dose computed tomography with hybrid iterative reconstruction. ULD-HIR means ultra-low-dose computed tomography with hybrid iterative reconstruction. ULD-DLR means ultra-low-dose computed tomography with deep learning reconstruction