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. 2016 Feb 3;18(2):224–235. doi: 10.1093/ehjci/jev323

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Published by Oxford University Press on behalf of the European Society of Cardiology 2016. This work is written by US Government employees and is in the public domain in the US.

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(A) CTA-identified ACAOS features. Lumen diameters obtained in double oblique view, taking the maximum and minimum diameters of the vessel at the most narrowed proximal location and the distal reference using the smallest available slice thickness (0.5–0.625 mm isotropic resolution). *Centreline length of vessel narrowing shown in double oblique and curved multiplanar views extending from (a) ACAOS vessel take-off to (b) normal calibre distal reference. ACAOS, anomalous origin of the coronary artery arising from the opposite cusp. (B) Intramural location and take-off angles obtained in multiplanar axial reconstructions at the level of the ACAOS ostium using the smallest available slice thickness (0.5–0.625 mm). Vessel take-off level (above/below commissure) shown in 3D reformatted image.