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Quantitative optical coherence tomography of arterial wall components.
F J van der Meer1, D J Faber, J Perrée
1Laser Center, Academic Medical Center, University of Amsterdam, K01-225, Meibergdreef 9, PO Box 22660, 1100 Amsterdam, The Netherlands.
Lasers in Medical Science
|May 24, 2005
Summary
Optical coherence tomography (OCT) precisely images atherosclerotic plaques. Quantitative OCT analysis accurately measures plaque components and their optical properties, aiding in distinguishing plaque from arterial wall tissues.
Area of Science:
- Biomedical Optics
- Cardiovascular Imaging
- Pathology
Background:
- Optical coherence tomography (OCT) offers high-resolution visualization of arterial walls and atherosclerotic plaques.
- Accurate characterization of plaque components is crucial for understanding disease progression.
Purpose of the Study:
- To validate OCT for quantitative analysis of atherosclerotic plaque structural dimensions.
- To determine optical attenuation coefficients of plaque components using OCT.
- To assess the impact of balloon dilation on OCT signals in arterial tissue.
Main Methods:
- High-resolution (3.5 µm axial, 7 µm lateral) and regular-resolution (15-20 µm axial, 20 µm lateral) OCT systems were used.
- Human autopsy samples and ex vivo porcine carotid arteries were imaged.
- OCT measurements were compared with histomorphometry for validation.
- Attenuation coefficients were measured in dilated and control arterial segments.
Main Results:
- Strong correlation found between OCT and histology for cap thickness measurements.
- Significant differences in attenuation coefficients were observed between diffuse intimal thickening, lipid-rich regions, and calcified tissue.
- Balloon dilation induced a time-dependent increase in attenuation coefficient, potentially due to apoptosis.
Conclusions:
- Both high and regular resolution OCT systems accurately image atherosclerotic plaques.
- Quantitative OCT analysis enables in situ determination of optical attenuation coefficients for plaque components.
- OCT facilitates discrimination between atherosclerotic plaque and normal arterial wall components.