Tomographic Imaging Device Raster Scan Adjustment
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Solution Overview
Problem
Current tomographic image capturing devices require a lengthy adjustment period for optimal image capturing conditions, which can be disrupted by involuntary eye movements, leading to suboptimal image quality and increased capture time.
Innovation Solution
A tomographic image capturing device with two image capturing modes and corresponding display modes, allowing for a thinned raster scan in the second mode to reduce adjustment time, enabling separate first and second adjustment operations based on specific and comprehensive tomographic pictures, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full raster scan is performed during image capturing condition adjustment, then all tomographic pictures can be observed and optimal conditions can be determined, but the adjustment time becomes excessively long
Solution Approach 1:
The patent divides the raster scan into two distinct types: center raster scan for initial adjustment and peripheral raster scan for comprehensive observation. This segmentation allows the system to perform quick initial optimization at the center while separately addressing peripheral areas, thereby reducing overall adjustment time while maintaining precision.
Solution Approach 2:
The patent implements preliminary action by first performing a center raster scan to quickly determine initial image capturing conditions, then using these preliminary results to guide subsequent peripheral scanning. This preliminary center scan establishes baseline optimization parameters before comprehensive peripheral observation, significantly reducing the total adjustment time required.
2Productivity
If adjustment is performed using only center position tomographic pictures, then adjustment is simple and fast, but form variation in peripheral areas causes defocus and replication
Solution Approach 1:
The patent applies local quality by treating the center and peripheral regions differently in the raster scan process. The center area undergoes rapid scanning for initial optimization, while peripheral areas are scanned separately to account for form variations specific to those regions. This localized approach ensures that each area receives appropriate adjustment attention, maintaining image quality consistency across the entire field of view.
3Area of stationary object
If the scanning field angle is widened to capture peripheral retina areas, then comprehensive imaging is achieved, but the curvature of tomographic pictures increases causing appearance position variations
Solution Approach 1:
The patent segments the scanning field into center and peripheral regions, applying different scanning strategies to each. The center region uses standard raster scanning for precise positioning, while peripheral regions are scanned separately to compensate for increased curvature and form variations. This segmentation maintains measurement precision across the entire widened field of view.
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 rapid determination of optimal image capturing conditions, minimizing the impact of eye movements and improving image quality by allowing for precise adjustments across the entire scanning region.
Implementation Method 1
split light from a light source into measurement light and reference light
Implementation Method 2
interference light generated by superposition of measurement light from the object and reference light
Implementation Method 3
measurement light reflected from the object
Implementation Method 4
reference light reflected from the reference object
Data Source
AI summary
The tomographic image capturing device of the present invention comprises a display means (18) configured to: split light from a light source (11) into measurement light and reference light and cause the measurement light and the reference light to be incident to an object (E) and a reference object (49), respectively; capture tomographic images of the object (E) on the basis of interference light generated by superposition of the measurement light reflected from the object (E) and the reference light reflected from the reference object (49); and display tomographic pictures of the object generated on the basis of the captured tomographic images. The tomographic image capturing device has a first image capturing mode and a second image capturing mode. The first image capturing mode is a mode in which the measurement light is two-dimensionally scanned by raster scan to be incident to the object (E) and the tomographic images of the object (E) are captured. The second image capturing mode is a mode in which the measurement light is two-dimensionally scanned by raster scan to be incident to the object (E) and the tomographic images of the object (E) are captured. The raster scan in the second image capturing mode is thinned from the raster scan in the first image capturing mode. The display means (18) is configured to be switchable between a first display mode and a second display mode. The first display mode is a mode in which a plurality of tomographic pictures including a region of interest of the object (E) is selected from among the tomographic pictures generated on the basis of the tomographic images captured in the second image capturing mode and only the selected plurality of tomographic pictures is displayed. The second display mode is a mode in which all of the tomographic pictures generated on the basis of the tomographic images captured in the second image capturing mode are in turn displayed. The capturing of the tomographic images in the first image capturing mode is performed after separately performing a first adjustment operation and a second adjustment operation for adjustment of an image capturing condition necessary for capturing the tomographic images in the first image capturing mode. The first adjustment operation is based on the tomographic pictures displayed in the first display mode. The second adjustment operation is based on the tomographic pictures displayed in the second display mode.