OCT Compensation Table Generation via Polynomial Resampling
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Solution Overview
Problem
The existing methods for generating compensation tables for OCT measurements are time-consuming and labor-intensive, requiring pre-measurement of wavelength sweep characteristics, which hinders efficient data conversion and image processing.
Innovation Solution
A method and apparatus that generate a compensation table by resampling an interference signal using a N-order polynomial model, optimizing model coefficients to convert interference signals from wavelength to wave number, eliminating the need for pre-measured wavelength sweep characteristics, and utilizing a reflection body interference signal to create a sparse signal-based conversion table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-measurement of wavelength sweep characteristics is performed to generate compensation table, then conversion accuracy is improved, but time consumption and labor intensity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing wavelength-to-wave-number conversion relationships in a compensation table during system setup. This allows the conversion to be performed efficiently during actual OCT measurements without real-time calculation overhead, resolving the contradiction between conversion accuracy and time consumption.
Solution Approach 2:
The patent uses beforehand cushioning by creating a lookup table that compensates for wavelength sweep characteristics in advance. This pre-computed compensation table cushions against the need for complex real-time conversions, ensuring accurate wave number spacing without time-consuming calculations during measurement.
2Measurement precision
If pre-measurement of wavelength sweep characteristics is performed to generate compensation table, then conversion accuracy is improved, but operational complexity increases
Solution Approach 1:
The patent applies self-service by implementing automatic generation of the compensation table using measured wavelength data. The system automatically performs the wavelength-to-wave-number conversion and stores the results, eliminating the need for manual table creation and reducing operational complexity while maintaining conversion accuracy.
Solution Approach 2:
The patent uses an intermediary approach by introducing a compensation table as a intermediate data structure between wavelength measurement and wave number analysis. This intermediary table simplifies the operational process by pre-processing the conversion relationships, making the system easier to operate while preserving measurement precision.
3Manufacturing precision
If interference signal is resampled using N-order polynomial model with optimized coefficients, then image quality is improved, but computational complexity increases
Solution Approach 1:
The patent applies parameter changes by using N-order polynomial models to transform the interference signal from wavelength domain to wave number domain. By optimizing the polynomial coefficients and selecting appropriate order parameters, the system achieves high image quality while managing computational complexity through efficient mathematical transformation.
Solution Approach 2:
The patent replaces mechanical scanning methods with computational polynomial transformation. Instead of using complex mechanical systems to achieve precise wave number spacing, the invention uses mathematical polynomial models to substitute and achieve the same effect computationally, improving image quality while reducing mechanical complexity.
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 simplifies the generation of compensation tables, improves image quality by fine-tuning interference signals, and reduces the effort required for data conversion, enabling efficient OCT image processing without the need for pre-measured wavelength characteristics.
Implementation Method 1
combining reflection light or backscattered light from a measuring object when the measuring light is irradiated on the measuring object with the reference light, and an optical tomography image is obtained based on the intensity of interference light between the reflection light and the reference light
Data Source
AI summary
A compensation table for compensating interference signal obtained by OCT measurement is generated easily. When a reflection body interference signal is obtained by OCT measurement, the reflection body interference signal is compensated by a compensation table (Formula (1)) to obtain an evaluation output signal. Then, a spectrum of the evaluation output signal is calculated to obtain an evaluation value of the spectrum. Thereafter, a model coefficient is updated such that the evaluation value becomes small.