Jones Matrix Layer-Resolved Phase Delay for Skin Aging
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Solution Overview
Problem
Polarization sensitive optical coherence tomography (PS-OCT) apparatuses face challenges in accurately quantifying collagen elements in skin tissues due to the laminated structure with random optical axes, leading to inaccurate results when the absolute value of cumulative phase delay values becomes zero.
Innovation Solution
A PS-OCT apparatus and method that utilize a Jones matrix to calculate local phase delay values for each layer of birefringent materials with random optical axes, employing a controller to determine the slope of absolute values as a skin aging index, and using one-way and round-trip Jones matrices to calculate cumulative optical axes and phase delay values per depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the absolute value of cumulative phase delay value is used for quantification, then the quantification process is simple, but the result becomes inaccurate when the value becomes zero due to random optical axes in laminated structures
Solution Approach 1:
The patent segments the cumulative phase delay into layer-specific local phase delay values. Instead of using a single cumulative value for the entire laminated structure, the system calculates separate phase delay values for each layer using Jones matrices, allowing accurate quantification even when individual layers have random optical axes that would cause the cumulative value to become zero.
Solution Approach 2:
The patent changes the measurement parameter from absolute cumulative phase delay to layer-resolved local phase delay. By using Jones matrices to calculate and accumulate phase delays layer by layer, the system maintains measurement accuracy while preserving computational feasibility, resolving the contradiction between simplicity and accuracy.
2Measurement precision
If Jones matrix calculation is used for each layer with random optical axes, then the quantification accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent divides the complex problem of analyzing laminated birefringent structures into manageable segments by calculating local phase delay values for each individual layer. This segmentation approach using Jones matrices reduces computational complexity compared to attempting to analyze the entire structure as a single unit, while maintaining high quantification accuracy.
Solution Approach 2:
The system performs preliminary calculations of local phase delay values for each layer before accumulating them to obtain the total phase delay. This preliminary action allows the system to handle random optical axes in each layer systematically, improving accuracy while organizing the computational process in a structured manner that manages complexity.
3Reliability
If collagen element quantification is performed using cumulative phase delay, then the skin aging assessment can be obtained, but the assessment becomes inaccurate when dealing with multiple layers having random optical axes
Solution Approach 1:
The patent segments the phase delay measurement into layer-specific components using Jones matrices. By calculating local phase delay values for each layer individually and then accumulating them, the system ensures accurate skin aging assessment even when multiple layers have random optical axes, preventing the cumulative phase delay from becoming zero and losing reliability.
Solution Approach 2:
The patent changes the measurement approach from direct cumulative phase delay to layer-resolved local phase delay accumulation. This parameter change ensures that the skin aging assessment remains reliable by accurately capturing the phase delay contribution from each layer, regardless of the orientation of optical axes in the laminated structure.
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
Enables accurate quantification of skin aging indices by considering the random optical axes, providing non-invasive tissue examination and additional information on tissue characteristics.
Implementation Method 1
polarization sensitive optical coherence tomography
Implementation Method 2
birefringent material having a multiple of layers where an optical axis of each layer is random
Implementation Method 3
calculate a local phase delay value of each layer using a Jones matrix for a birefringent material
Data Source
AI summary
Disclosed is a polarization sensitive optical coherence tomography apparatus and control method thereof. According to the polarization sensitive optical coherence tomography apparatus and control method thereof of the present invention, the local phase delay value of each layer of a multiple of layers using Jones matrix for a birefringent material having the multiple of layers where each layers optical axis is random based on a polarized signal detected in an optical detector may be calculated. According to the present invention, a skin aging level can be accurately examined by obtaining an accurate accumulated phase delay value for a multiple of layers of birefringent material having a random optical axis.