Ophthalmic Imaging Device Wide-Area Motion Contrast Segmentation
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Solution Overview
Problem
Existing ophthalmic imaging devices face difficulties in easily acquiring wide-range motion contrast data, as they are not designed to efficiently process OCT signals from non-overlapping unit areas within a designated wide area.
Innovation Solution
An ophthalmic imaging device and program that acquire OCT signals by scanning a test eye with measurement light, processing multiple OCT signals from the same position at different timings across non-overlapping unit areas within a wider area, to generate motion contrast data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If motion contrast data is acquired using a single unit area, then the acquisition process is simple, but the coverage area is limited and cannot provide wide-range motion contrast data
Solution Approach 1:
The patent divides the wide area into multiple non-overlapping unit areas, where each unit area is processed independently to acquire motion contrast data. This segmentation allows the system to maintain simple processing for each unit while achieving wide-area coverage through combination of multiple unit results.
Solution Approach 2:
The patent combines motion contrast data from multiple non-overlapping unit areas to generate wide-range motion contrast data. By merging results from segmented regions, the system achieves both wide coverage and manageable processing complexity.
2Measurement precision
If multiple OCT signals are acquired for the same position at different timings, then motion contrast data quality improves, but the acquisition time increases
Solution Approach 1:
The patent segments the wide area into multiple non-overlapping unit areas, allowing parallel or sequential acquisition of OCT signals across different units. This reduces total acquisition time compared to repeatedly scanning the entire wide area, while still obtaining multiple temporal samples for motion contrast calculation in each unit.
Solution Approach 2:
The patent acquires OCT signals at multiple time points within each unit area, obtaining sufficient temporal data for motion contrast analysis. By focusing measurements on essential time points rather than continuous monitoring, the system achieves good motion contrast quality with reduced acquisition time.
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 the easy acquisition of wide-range motion contrast data by positioning and processing OCT signals from multiple unit areas, improving the efficiency and accuracy of motion contrast imaging.
Implementation Method 1
acquire an optical coherence tomography (OCT) signal by splitting light from a light source into measurement light and reference light, and processing an interference signal induced by the reference light and measurement light with which a test object is irradiated and then which is reflected by the test object
Data Source
AI summary
An ophthalmic imaging device that captures an image of a test eye, the device includes: an OCT optical system configured to acquire an OCT signal by scanning a tissue of the test eye with measurement light, the ophthalmic imaging device configured to execute: receiving a designation of a wide area which is wider than a unit area which is an acquisition unit for acquiring motion contrast data indicating a motion of the tissue; acquiring a plurality of OCT signals for the same position at different timing in each of a plurality of unit areas, the plurality of unit areas being positioned in the designated wide area and being not completely overlapped with each other; and acquiring the motion contrast data of each of the plurality of unit areas by processing the plurality of OCT signals acquired for the same position.