Optical Coherence Tomography Plaque Vulnerability Assessment
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Solution Overview
Problem
Current methods for characterizing atherosclerotic plaques, such as intravascular ultrasound (IVUS) and optical coherence tomography (OCT), are limited in their ability to accurately assess plaque vulnerability, particularly in identifying thin fibrous caps and surface erosions, which are risk factors for acute myocardial infarction.
Innovation Solution
The use of spatially dependent reflectance measurements, multiple wavelength reflectance measurements, low-coherence interferometry, and polarization-sensitive optical coherence tomography to determine fibrous cap thickness, macrophage content, and identify plaques with surface erosions, by analyzing the optical properties and layer structures of atherosclerotic plaques using diffusion theory and Monte Carlo simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intravascular ultrasound (IVUS) is used to obtain cross-sectional images of tissue, then imaging capability is provided, but resolution is insufficient to detect thin fibrous caps
Solution Approach 1:
The patent replaces mechanical ultrasound imaging with optical imaging methods (OCT and spatially dependent reflectance spectroscopy) that use light instead of sound waves. This substitution enables higher resolution detection of thin fibrous caps (10-50 μm) while maintaining practical device complexity through catheter-based implementations.
2Measurement precision
If OCT is used to obtain cross-sectional images of tissue, then resolution sufficient to detect thin fibrous caps is achieved, but capability to characterize plaque composition and vulnerability is limited
Solution Approach 1:
The patent merges OCT imaging capability with spatially dependent reflectance spectroscopy into a single integrated system. This combination allows simultaneous acquisition of both high-resolution structural images and functional optical property measurements (absorption and scattering coefficients), providing comprehensive plaque characterization including composition, cap thickness, and vulnerability assessment.
Solution Approach 2:
The patent creates a multi-functional imaging system that performs multiple diagnostic functions: structural imaging (OCT), compositional analysis (spectroscopy), quantitative measurement of optical properties, and vulnerability assessment. This universal approach eliminates the need for separate diagnostic procedures and provides comprehensive plaque evaluation.
3Quantity of substance
If fluorescence spectroscopy is used to detect plaques, then presence of lipids is detected, but spatial resolution of parameters directly responsible for plaque rupture is insufficient
Solution Approach 1:
The patent segments the plaque analysis into distinct functional components: structural imaging for morphology, spectroscopy for composition, and quantitative optical property measurement for vulnerability assessment. This segmentation allows each component to optimize its specific function while the integrated system provides comprehensive evaluation with high spatial resolution for all critical parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These methods enable precise characterization of atherosclerotic plaque composition, including fibrous cap thickness and macrophage content, thereby assessing plaque vulnerability and potentially guiding management to prevent acute cardiovascular events.
Implementation Method 1
the distinct layers present in atherosclerotic plaques have different scattering, absorption, and anisotropy coefficients
Implementation Method 2
the distinct layers present in atherosclerotic plaques have different scattering, absorption, and anisotropy coefficients
Implementation Method 3
low-coherence interferometry, and polarization-sensitive optical coherence tomography
Implementation Method 4
polarization-sensitive optical coherence tomography
Data Source
AI summary
Methods for diagnosing vulnerable atherosclerotic plaque using optical coherence tomography to measure tissue optical properties, including backreflectance of heterogeneous layers, such as plaque cap, lipid pool composition and macrophage presence. Methods also include measurement of spatially and temporally dependent reflectance, measurement of multiple wavelength reflectance, low coherence interferometry, polarization and quantification of macrophage content.