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. 2019 Dec 19;9:19423. doi: 10.1038/s41598-019-55792-6

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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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CT perfusion study of a 60-year-old female patient after coiling of a ruptured basilar tip aneurysm. The upper panel (a–c) show images before, and the lower panel (d–f) show images after iMAR application. Obvious metal artifact reduction was apparent after iMAR application, which improved the detection of MTT prolongation in the left temporal lobe (c,f) and increased rater confidence. Rater confidence in analysing the CBV (b,e), which showed no asymmetry even after artifact reduction, was also increased. Note: A hypodense ring artifact surrounded by a hyperdense ring was observed around the metal in the source images processed with iMAR (d).