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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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Use of pons-midbrain index on computed tomography angiogram source imaging (CTASI) of a basilar artery stroke managed at Imperial College Healthcare Trust. Scores of 0 (no hypoattenuation), 1 (<50% hypoattenuation), or 2 (>50% hypoattenuation) are attributed to each half of the pons and midbrain with a total score of 8. Images A and B show a pons-midbrain index score of 5 (2 right pons, 1 left pons, 1 right midbrain, 1 left midbrain). Image C highlights how closely CTASI can correlate to MRI (magnetic resonance imaging)-DWI (diffusion weighted imaging)