Abstract
Purpose
18F-sodium fluoride (18F-NaF) has shown promise in assessing disease activity in coronary arteries, but currently used measures of activity – such as maximum target to background ratio (TBRmax) – are defined by single pixel count values. We aimed to develop a novel coronary-specific measure of 18F-NaF PET reflecting activity throughout the entire coronary vasculature (coronary microcalcification activity [CMA]).
Methods
Patients with recent myocardial infarction and multi-vessel coronary artery disease underwent 18F-NaF PET and coronary CT angiography. We assessed the association between coronary 18F-NaF uptake (both TBRmax and CMA) and coronary artery calcium scores (CACS) as well as low attenuation plaque (LAP, attenuation < 30 Hounsfield units) volume.
Results
In 50 patients (64% males, 63 ± 7 years), CMA and TBRmax were higher in vessels with LAP compared to those without LAP (1.09 [0.02, 2.34] versus 0.0 [0.0, 0.0], p < 0.001 and 1.23 [1.16, 1.37] versus 1.04 [0.93, 1.11], p < 0.001). Compared to a TBRmax threshold of 1.25, CMA > 0 had a higher diagnostic accuracy for detection of LAP: sensitivity of 93.1 (83.3–98.1)% versus 58.6 (44.9–71.4)% and a specificity of 95.7 (88.0–99.1)% versus 80.0 (68.7–88.6)% (both p < 0.001).
18F-NaF uptake assessed by CMA correlated more closely with LAP (r = 0.86, p < 0.001) than the CT calcium score (r = 0.39, p < 0.001), with these associations outperforming those observed for TBRmax values (LAP r = 0.63, p < 0.001; CT calcium score r = 0.30, p < 0.001).
Conclusions
Automated assessment of disease activity across the entire coronary vasculature is feasible using 18F-NaF CMA, providing a single measurement that has closer agreement with CT markers of plaque vulnerability than more traditional measures of plaque activity.
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Abbreviations
- CAD:
-
Coronary artery disease
- CMA:
-
Coronary microcalcification activity
- CI:
-
Confidence intervals
- CT:
-
Computed tomography
- PET:
-
Positron emission tomography
- SD:
-
Standard deviation
- SUVmax:
-
Maximum standard uptake value
- TBRma:
-
Maximum target to background ratio
- 18F-NaF:
-
18F-sodium fluoride
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Funding
This research was supported in part by grants R01HL135557 and R01HL133616 from the National Heart, Lung, and Blood Institute/National Institute of Health (NHLBI/NIH) and by a grant from the Dr. Miriam & Sheldon G. Adelson Medical Research Foundation. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. This research is also supported by a grant from the Dr. Miriam & Sheldon G. Adelson Medical Research Foundation. Data analysis was supported by a grant from Siemens Medical Systems.
Other author relationshipsDEN (CH/09/002, RE/13/3/30183) and MRD (FS/14/78/31020) are also supported by the British Heart Foundation. DEN is the recipient of a Wellcome Trust Senior Investigator Award (WT103782AIA) and MRD of Sir Jules Thorn Award for Biomedical Research Award (2015).
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Kwiecinski, J., Cadet, S., Daghem, M. et al. Whole-vessel coronary 18F-sodium fluoride PET for assessment of the global coronary microcalcification burden. Eur J Nucl Med Mol Imaging 47, 1736–1745 (2020). https://doi.org/10.1007/s00259-019-04667-z
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DOI: https://doi.org/10.1007/s00259-019-04667-z