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Figure 4 Examples of CCTA-Based and ICA-Based Stenosis Quantification

Coronary computed tomographic angiography (CCTA) images are on the left, and invasive coronary angiography (ICA) images are on the right. Computed tomography–based quantitative coronary analysis (CTQCA) was performed on the thinnest possible image slice by using a simplified formula based on the technique described by Reiber et al. (20) (see Methods section). This simplified formula may be useful for future investigations requiring routine stenosis calculation on CCTA. (A) Quantification of an intermediately stenotic noncalcified plaque in the midleft circumflex artery. (B) Quantification of a severely occlusive noncalcified plaque in the proximal left anterior descending artery. (C) Quantification of mild stenosis from a calcified plaque in the proximal left anterior descending artery.