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. 2023 Aug 9;2(1):e000407. doi: 10.1136/bmjmed-2022-000407

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Demonstration of ASPECTS (Alberta Stroke Protocol Early Computed Tomography Score) on non-contrast computed tomography, in a patient presenting to Imperial College Healthcare Trust comprehensive stroke centre with images acquired from the Rapid.AI software package. The middle cerebral artery territory is divided into 10 regions, including six cortical and four deep grey matter structures. Hounsfield units are used to identify areas of early ischaemic change and one point is subtracted from the total score of 10 for each region affected