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. 2019 Aug 6;12(8):e008574. doi: 10.1161/CIRCIMAGING.118.008574

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© 2019 The Authors.

Circulation: Cardiovascular Imaging is published on behalf of the American Heart Association, Inc., by Wolters Kluwer Health, Inc. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution, and reproduction in any medium, provided that the original work is properly cited.

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Figure 3. — Quantification of coronary ¹⁸F-fluoride activity. Visual identification of coronary ¹⁸F-fluoride activity was present in all ruptured plaques and 13.8% of stable coronary segments. The signal intensity of ¹⁸F-fluoride activity in coronary plaque was assessed both visually and semi-quantitatively by referencing to atrial blood pool activity (maximum target-to-background ratio [TBR_MAX]). Activity in coronary plaques was categorized into activity above blood pool (TBR_MAX >1.1), at or around blood pool (TBR_MAX 0.9–1.1), or below blood pool (TBR_MAX <0.9). Higher intensity signals were observed in stable segments compared with ruptured plaques.