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The diagnostic accuracy of ex vivo MRI for human atherosclerotic plaque characterization
M Shinnar1, J T Fallon, S Wehrli
1Cardiovascular Institute, Department of Medicine, New York, NY, USA. meir_shinnar@smtplink.mssm.edu
Abstract:
Recent evidence indicates that the type of atherosclerotic plaque, rather than the degree of obstruction to flow, is an important determinant of the risk of cardiovascular complications. In previous work, the feasibility of using MRI for the characterization of plaque components was shown. This study extends the previous work to all the plaque components and shows the accuracy of this method. Twenty-two human carotid endarterectomy specimens underwent ex vivo MRI and histopathological examination. Sixty-six cross sections were matched between MRI and histopathology. In each cross section, the presence or absence of plaque components were prospectively identified on the MRI images. The overall sensitivity and specificity for each tissue component were very high. Calcification and fibrocellular tissue were readily identified. Lipid core was also identifiable. However, thrombus was the plaque component for which MRI had the lowest sensitivity. A semiautomated algorithm was created to identify all major atherosclerotic plaque components. MRI can characterize carotid artery plaques with a high level of sensitivity and specificity. Application of these results in the clinical setting may be feasible in the near future.
Insights
Magnetic Resonance Imaging (MRI) accurately identifies atherosclerotic plaque components, crucial for predicting cardiovascular risk. This advanced imaging technique offers high sensitivity and specificity for characterizing plaque composition in carotid arteries.
Area of Science:
- Cardiovascular Imaging
- Medical Diagnostics
- Atherosclerosis Research
Background:
- Atherosclerotic plaque composition, not just stenosis degree, influences cardiovascular event risk.
- Previous studies demonstrated Magnetic Resonance Imaging (MRI) feasibility for plaque component characterization.
- This study aimed to comprehensively assess MRI accuracy for all major plaque components.
Purpose of the Study:
- To evaluate the accuracy of ex vivo MRI in characterizing the components of human carotid artery plaques.
- To determine the sensitivity and specificity of MRI for identifying calcification, lipid core, fibrocellular tissue, and thrombus.
- To develop and assess a semiautomated algorithm for atherosclerotic plaque component identification using MRI.
Main Methods:
- Ex vivo MRI was performed on 22 human carotid endarterectomy specimens.
- Histopathological examination was used as the gold standard for comparison.
- Sixty-six cross-sections were analyzed, with plaque components prospectively identified on MRI images.
Main Results:
- MRI demonstrated very high overall sensitivity and specificity for identifying most plaque components.
- Calcification and fibrocellular tissue were readily and accurately identified.
- Lipid core identification was successful, though MRI showed lower sensitivity for detecting thrombus.
Conclusions:
- Ex vivo MRI is a highly accurate method for characterizing major atherosclerotic plaque components in carotid arteries.
- The developed semiautomated algorithm aids in comprehensive plaque analysis.
- Clinical application of MRI for carotid plaque characterization holds promise for improved cardiovascular risk assessment.