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European Journal of Nuclear Medicine and Molecular Imaging

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01.12.2013 | Original Article

The complementary roles of dynamic contrast-enhanced MRI and ¹⁸F-fluorodeoxyglucose PET/CT for imaging of carotid atherosclerosis

verfasst von: Claudia Calcagno, Sarayu Ramachandran, David Izquierdo-Garcia, Venkatesh Mani, Antoine Millon, David Rosenbaum, Ahmed Tawakol, Mark Woodward, Jan Bucerius, Erin Moshier, James Godbold, David Kallend, Michael E. Farkouh, Valentin Fuster, James H. F. Rudd, Zahi A. Fayad

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 12/2013

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Abstract

Purpose

Inflammation and neovascularization in vulnerable atherosclerotic plaques are key features for severe clinical events. Dynamic contrast-enhanced (DCE) MRI and FDG PET are two noninvasive imaging techniques capable of quantifying plaque neovascularization and inflammatory infiltrate, respectively. However, their mutual role in defining plaque vulnerability and their possible overlap has not been thoroughly investigated. We studied the relationship between DCE-MRI and ¹⁸F-FDG PET data from the carotid arteries of 40 subjects with coronary heart disease (CHD) or CHD risk equivalent, as a substudy of the dal-PLAQUE trial (NCT00655473).

Methods

The dal-PLAQUE trial was a multicenter study that evaluated dalcetrapib, a cholesteryl ester transfer protein modulator. Subjects underwent anatomical MRI, DCE-MRI and ¹⁸F-FDG PET. Only baseline imaging and biomarker data (before randomization) from dal-PLAQUE were used as part of this substudy. Our primary goal was to evaluate the relationship between DCE-MRI and ¹⁸F-FDG PET data. As secondary endpoints, we evaluated the relationship between (a) PET data and whole-vessel anatomical MRI data, and (b) DCE-MRI and matching anatomical MRI data. All correlations were estimated using a mixed linear model.

Results

We found a significant inverse relationship between several perfusion indices by DCE-MRI and ¹⁸F-FDG uptake by PET. Regarding our secondary endpoints, there was a significant relationship between plaque burden measured by anatomical MRI with several perfusion indices by DCE-MRI and ¹⁸F-FDG uptake by PET. No relationship was found between plaque composition by anatomical MRI and DCE-MRI or ¹⁸F-FDG PET metrics.

Conclusion

In this study we observed a significant, weak inverse relationship between inflammation measured as ¹⁸F-FDG uptake by PET and plaque perfusion by DCE-MRI. Our findings suggest that there may be a complex relationship between plaque inflammation and microvascularization during the different stages of plaque development. ¹⁸F-FDG PET and DCE-MRI may have complementary roles in future clinical practice in identifying subjects at high risk of cardiovascular events.

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Titel: The complementary roles of dynamic contrast-enhanced MRI and 18F-fluorodeoxyglucose PET/CT for imaging of carotid atherosclerosis
verfasst von: Claudia Calcagno
Sarayu Ramachandran
David Izquierdo-Garcia
Venkatesh Mani
Antoine Millon
David Rosenbaum
Ahmed Tawakol
Mark Woodward
Jan Bucerius
Erin Moshier
James Godbold
David Kallend
Michael E. Farkouh
Valentin Fuster
James H. F. Rudd
Zahi A. Fayad
Publikationsdatum: 01.12.2013
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 12/2013
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI: https://doi.org/10.1007/s00259-013-2518-4

Springer Medizin

Abstract

Purpose

Methods

Results

Conclusion

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