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. 2021 Oct 14;13(3):399–409. doi: 10.1007/s12975-021-00953-x

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© The Author(s) 2021

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. 1 — Illustration of different perfusion patterns in the represented patients. (A) An 89-year-old woman who had acute infarction in the left basal ganglia (arrow) on diffusion weighted imaging (DWI), with prolonged mean transit time (MTT, red arrowhead) and reduced cerebral blood flow (CBF, yellow arrowhead). The dynamic perfusion imaging showed a perfusion defect without collateral flow, which was classified as a hypoperfusion pattern. (B) A 76-year-old woman who had acute infarction in the left centrum semiovale on DWI (arrow) and a perfusion defect on MTT (red arrowhead) and CBF (yellow arrowhead). She was classified as having a hypoperfusion pattern, because of the delayed collateral flow without complete filling. (C) An 87-year-old man had acute infarction in the right basal ganglia on DWI (arrow) and a perfusion defect on MTT (red arrowhead) and CBF (yellow arrowhead). He was classified as having compensated perfusion because there was retrograde collateral flow with complete contrast filling. (D) An 86-year-old woman had acute infarction in the centrum semiovale on DWI (arrow) without visible perfusion defects. She was classified as having a normal perfusion pattern because of the normal perfusion