OCT Device Motion Contrast Control via Front Image Registration
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Solution Overview
Problem
Existing optical coherence tomography (OCT) devices face challenges in obtaining accurate motion contrast data due to the movement of the test substance during signal acquisition, leading to inconsistent OCT signals from different positions, which hinders the generation of good motion contrast data.
Innovation Solution
The implementation of an OCT device with a control program that synchronizes the acquisition of OCT signals with front images, using image registration and phase correction techniques to align and filter the signals, ensuring that multiple OCT signals are obtained from the same site with high accuracy, thereby improving the quality of motion contrast data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple OCT signals are acquired from the same site over time to obtain motion contrast data, then the quality of motion contrast data improves, but the test substance moves during acquisition causing signals to be obtained from different positions
Solution Approach 1:
The system acquires front images at the same time as OCT signals, uses image registration to detect positional shifts between front images, and applies phase correction to compensate for these shifts in the OCT signals. This feedback mechanism ensures that motion contrast data is obtained from consistent anatomical locations despite test substance movement
Solution Approach 2:
Front images serve as an intermediary reference to monitor and detect positional changes of the test substance. By registering front images and comparing their positions, the system identifies movement patterns and uses this information to correct the OCT signals, ensuring accurate motion contrast measurement
2Ease of operation
If OCT signals are acquired without synchronization with front images, then the acquisition process is simpler, but it becomes difficult to determine whether signals are obtained from the same position
Solution Approach 1:
The system combines front image acquisition with OCT signal acquisition into a synchronized process. Both types of data are collected simultaneously and processed together through image registration and phase correction, ensuring that position information is available to verify and correct the OCT signal locations without adding significant operational complexity
Data Source
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AI summary
An optical coherence tomography device includes: an OCT optical system configured to obtain a OCT signal; a front observation optical system configured to obtain a front image of the test substance; and a controller is configured to: control the OCT optical system to obtain first temporally different OCT signals with respect to the test substance; control the front observation optical system to obtain a first front image of the test substance at the time the first OCT signals are obtained; control the front observation optical system to obtain a second front image of the test substance after that; determine whether or not the plurality of first OCT signals are good based on a positional deviation between the first and second front images; and obtain motion contrast data of the test substance when it is determined that the plurality of first OCT signals are good.