Evaluation of atherosclerotic lesions using NMR microimaging
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M Asdente1, L Pavesi, P L Oreste
1Institute of Pharmacological Sciences, University of Milan, Italy.
Abstract:
Magnetic resonance imaging (MRI) has been proposed as a potential tool in the evaluation of atherosclerotic lesions. However, two basic difficulties have to date prevented the full exploitation of the potentials of this technique: the poor spatial resolution of the conventional tomographs and the wide variety of the lesions as well as their intrinsic dishomogeneity. In this study the in vitro morphology of normal and atherosclerotic vascular tissue specimens has been evaluated using a high resolution spectometer equipped with a microimaging device. Morphological features of the vessel walls as small as 10(-1) mm have been detected and the distribution of lipids and of calcified or necrotic regions has been evidenced in atherosclerotic plaques. Different techniques, such as local spectroscopy performed on volumes of 1 mm3 and localized magnetization recovery measurements, have been employed to characterize specific regions of the vessel walls from the chemical and the physical point of view. The good agreement of NMR findings with histological data allows us to conclude that NMR microimaging represents a suitable technique for the in vitro detection and characterization of atheromatous lesions.
Insights
High-resolution magnetic resonance imaging (MRI) can now detect and characterize atherosclerotic plaques in vitro. This advanced NMR microimaging overcomes limitations of conventional methods for evaluating vascular tissue and arterial disease.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Cardiovascular Research
Background:
- Magnetic resonance imaging (MRI) shows promise for evaluating atherosclerotic lesions.
- Limitations include poor spatial resolution and lesion heterogeneity.
- Conventional MRI struggles with detailed analysis of vascular tissue.
Purpose of the Study:
- To evaluate the in vitro morphology of normal and atherosclerotic vascular tissue using high-resolution MRI.
- To overcome limitations of conventional tomographs in resolving small morphological features.
- To characterize chemical and physical properties of atherosclerotic plaques.
Main Methods:
- Utilized a high-resolution spectrometer with a microimaging device for in vitro analysis.
- Applied local spectroscopy on small volumes (1 mm3) for chemical characterization.
- Employed localized magnetization recovery measurements for physical property assessment.
- Detected morphological features as small as 0.1 mm.
Main Results:
- Successfully detected and visualized morphological features of vessel walls down to 0.1 mm.
- Mapped the distribution of lipids, calcified, and necrotic regions within atherosclerotic plaques.
- NMR findings showed good agreement with histological data.
Conclusions:
- NMR microimaging is a suitable technique for in vitro detection of atheromatous lesions.
- This method allows for detailed characterization of plaque composition and morphology.
- High-resolution MRI overcomes previous limitations in evaluating atherosclerotic disease.