Ophthalmology Device OCT Measurement Speed Range Control
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Solution Overview
Problem
Existing OCT measurement techniques face challenges in achieving high-speed and wide-angle measurements due to limitations in wavelength sweep speed and optical path length differences, leading to increased measurement time and burden on examiners or subjects.
Innovation Solution
The ophthalmologic apparatus employs a configuration that allows for high-speed and wide-angle OCT measurements by changing the reference position of the measurement range in the depth direction and adjusting the wavelength sweep speed in accordance with the position of the scan region, while maintaining a fixed fixation target position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wavelength sweep speed is increased to achieve high-speed OCT measurement, then the measurement speed is improved, but the measurement range in the depth direction is limited
Solution Approach 1:
The patent applies dynamics by making the reference position of the measurement range variable rather than fixed. The reference position is dynamically adjusted according to the scan region position, allowing the measurement range to adapt to different imaging areas while maintaining high measurement speed through optimized wavelength sweep parameters.
Solution Approach 2:
The patent changes the parameter of reference position in the depth direction based on the scan region position. By adjusting this parameter dynamically, the system achieves both high measurement speed and extended measurement range, resolving the contradiction between speed and range.
2Length of moving object
If the measurement site is moved by changing the projected position of the fixation target to obtain wide-range OCT results, then the measurement range is improved, but the measurement time increases and operational burden increases
Solution Approach 1:
The patent performs preliminary action by pre-adjusting the reference position of the measurement range according to the scan region position before actual measurement. This preliminary configuration allows the system to capture wide-angle OCT results in a single measurement without requiring repeated measurements at different fixation target positions, thereby reducing measurement time and operational burden.
Solution Approach 2:
The patent achieves multi-functionality by enabling a single OCT measurement to cover multiple scan regions through dynamic reference position adjustment. The system can obtain wide-range OCT results without requiring separate measurements for different regions, consolidating multiple functions into one efficient measurement process.
3Productivity
If the reference position of the measurement range is changed according to the scan region position, then the measurement range and speed are improved, but the device complexity increases
Solution Approach 1:
The patent implements feedback by using the scan region position information to dynamically adjust the reference position of the measurement range. This feedback mechanism allows the system to automatically optimize measurement parameters based on the current imaging conditions, improving measurement efficiency while keeping the control logic manageable through rule-based adjustment.
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 enables efficient acquisition of wide-angle OCT measurement results in a shorter measurement time, simplifying the control of wide-angle OCT measurements and improving the ease of use for both examiners and subjects.
Implementation Method 1
The swept source OCT scans A lines of the object by sweeping within a predetermined wavelength range using a wavelength sweep light source to change a wavelength of measurement light
Implementation Method 2
acquires information in a depth direction of the object by dispersing interference light and detecting the spectral distribution
Data Source
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AI summary
This ophthalmology device comprises a fixation projection system, interference optics, and a control unit, for the purpose of conducting an OCT measurement at high-speed and a wide-angle, readily. The fixation projection system projects a fixation light flux onto the fundus of an eye being examined. The interference optics, which includes an optical scanner, splits the light from the light source into a measurement light and a reference light, irradiates the measurement light deflected by the optical scanner to the eye being examined, and detects the interference light between a return light from the eye being examined and the reference light. In a state wherein the projection position of the fixation light flux on the fundus is fixed, the control unit controls the interference optics, thereby executing the OCT measurement on a first scan region and a second scan region, which are different from one another, in the eye being examined.