Spectral Analysis of Optical Coherence Tomography Images
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Solution Overview
Problem
Current optical coherence tomography (OCT) techniques face challenges in accurately identifying lipid-rich regions within atherosclerotic plaques due to artifacts and limited chemical and molecular contrast, which hinders the understanding of coronary artery disease progression and response to therapy.
Innovation Solution
The method involves depth-resolved spectral analysis of OCT interferometric data to generate spectroscopic information, reducing scattering effects and classifying tissue types based on spectroscopic data, enabling the spatial identification of lipid-rich regions and improving image contrast for more accurate disease area identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OCT techniques are used to image tissue, then high spatial resolution and large area coverage are achieved, but chemical and molecular contrast is insufficient and artifacts make lipid identification difficult
Solution Approach 1:
The patent segments the OCT signal into spectral components by wavelength, allowing independent analysis of different spectral regions. This enables separation of scattering information (for structural imaging) from absorption information (for chemical identification), resolving the contradiction between spatial resolution and chemical contrast.
Solution Approach 2:
The patent adds a spectral dimension to the conventional spatial (x-y) and depth (z) dimensions of OCT imaging. By introducing wavelength as a fourth dimension, the system can simultaneously resolve spatial structure and chemical composition, as different tissues have characteristic spectral absorption patterns.
2Ease of manufacture
If conventional OCT contrast mechanisms are used, then structural features are visualized, but chemical identification of lipid pools is inaccurate due to scattering-dominated contrast
Solution Approach 1:
The patent applies different contrast mechanisms to different spectral regions and depth locations. By analyzing the spectral shape and intensity at each wavelength and depth, the system can identify lipid pools through their characteristic absorption patterns while maintaining the ability to visualize structural features through scattering contrast.
Solution Approach 2:
The patent changes the contrast parameter from purely scattering-based intensity to a combination of scattering and absorption characteristics. By measuring the spectral shape and using it to calculate absorption coefficients, the system can accurately identify chemical composition while maintaining structural visualization capability.
3Loss of information
If spectral analysis is performed to identify lipid-rich regions, then chemical information is obtained, but processing complexity increases
Solution Approach 1:
The patent performs preliminary spectral estimation and classification in the frequency domain before final diagnosis. By pre-processing the spectral data to identify characteristic patterns and reducing dimensionality, the system simplifies the overall processing complexity while maintaining chemical identification accuracy.
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
This approach enhances the accuracy and speed of identifying diseased areas by providing detailed chemical and molecular information, facilitating better diagnosis and treatment decisions.
Implementation Method 1
OFDI generates axial depth profiles at high spatial resolution by measuring the delay of the source signal as it is reflected by subsurface structures
Implementation Method 2
Spectroscopic OCT (SOCT) technique is a post-processing technique that uses time-frequency analysis performed on the interferometric data to generate depth resolved spectra
Implementation Method 3
In an exemplary embodiment where spectroscopic OCT is used to characterize atherosclerotic plaques, the common wavelengths used for OCT overlap spectral absorption peaks of lipid within the range of 1250-1350 nm, 1200-1400 nm, or more broadly 1000-1400 nm
Data Source
AI summary
According to an exemplary embodiment of the present disclosure, apparatus and method can be provided for generating information for at least one structure. For example, using at least one first arrangement, it is possible to receive at least one first radiation from the at least one structure and at least one second radiation from a reference, and interfere the first and second radiations to generate at least one third radiation. Further, with at least one second arrangement, it is possible to generate spectroscopic data as a function of the at least one third radiation, and reduce at least one scattering effect in the spectroscopic data to generate the information. In addition or as an alternative, according to a further exemplary embodiment of the present disclosure, it is possible to classify a type of the structure based on the spectroscopic data to generate the information.