PhS-OCE Strain Calculation via Segmented Displacement Tracking
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Solution Overview
Problem
Phase-sensitive optical coherence elastography (PhS-OCE) faces challenges such as speckle decorrelation due to pixel-level displacement and limited sensitivity to tangential displacement and strain fields.
Innovation Solution
A strain calculation method for PhS-OCE that involves obtaining interference spectra, extracting spectral information, performing subpixel displacement tracking using image correlation matching, and calculating tangential and axial strain fields by combining displacement fields and differential phase fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel-level displacement tracking is used in PhS-OCE, then axial strain measurement sensitivity is improved, but speckle decorrelation phenomenon occurs limiting measurement range
Solution Approach 1:
The patent segments the displacement measurement into two distinct components: axial displacement measured by phase-sensitive OCT with subpixel precision, and tangential displacement measured by image correlation method. This segmentation allows each method to operate within its optimal measurement range without causing speckle decorrelation, thereby resolving the contradiction between measurement precision and reliability
Solution Approach 2:
The patent creates a composite measurement approach by combining phase information from OCT with amplitude information from image correlation. This composite method integrates the strengths of both techniques: phase-based axial displacement tracking provides high sensitivity while image correlation-based tangential displacement tracking prevents speckle decorrelation, thus expanding the overall measurement range
2Measurement precision
If phase difference measurement is used, then axial displacement sensitivity is improved, but tangential displacement and strain field detection capability deteriorates
Solution Approach 1:
The patent makes the measurement system universal by enabling it to detect both axial and tangential displacement and strain fields simultaneously. The phase difference measurement handles axial components while image correlation handles tangential components, allowing the system to perform multiple measurement functions that were previously mutually exclusive
3Measurement precision
If traditional PhS-OCE method is used, then axial strain measurement capability is maintained, but tangential strain field measurement capability is lost
Solution Approach 1:
The patent merges two previously separate measurement approaches: phase-based axial strain measurement and image correlation-based tangential strain measurement. By combining these methods into a unified framework, the system simultaneously achieves both axial and tangential strain field measurement capabilities without compromising either function
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 method eliminates speckle decorrelation, expands the measurement range, and enables the detection of tangential displacement and strain fields while maintaining high axial sensitivity in strain measurement.
Implementation Method 1
The basic principle of PhS-OCE involves that OCT method is employed to measure interference signals of light to obtain structural information within samples
Implementation Method 2
This technique mainly relies on measuring the phase difference information of light, so as to capture tiny displacement and strain within the samples
Data Source
AI summary
Disclosed is a strain calculation method and system for phase-sensitive optical coherence elastography (PhS-OCE), including the following steps: obtaining interference spectra for various states during sample deformation, and extracting spectral information including multiple amplitude maps and multiple phase maps from these interference spectra. In the present disclosure, the speckle decorrelation phenomenon in PhS-OCE can be eliminated, the measurement range is expanded, and tangential displacement fields and strain fields can be measured by PhS-OCE technique while ensuring high axial sensitivity in strain measurement.