OCT Layer Thickness Matching Across Acquisition Conditions
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Solution Overview
Problem
In the ophthalmologic field, it is challenging to perform long-term follow-up of a subject eye using OCT data acquired over several years due to changes in apparatus specifications and varying acquisition conditions, making it difficult to compare and match data from different devices.
Innovation Solution
An ophthalmologic information processing apparatus and method that acquires layer thickness information from OCT data, matches it considering differences in acquisition conditions, and displays the results, allowing for effective follow-up by correcting for variations in depth and transverse directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If OCT data is acquired over several years using different apparatuses, then long-term follow-up capability is improved, but measurement precision deteriorates due to changes in apparatus specifications and acquisition conditions
Solution Approach 1:
The patent applies parameter changes by transforming OCT data from different apparatuses into a unified reference coordinate system. The system changes the parameters of depth direction and transverse direction to match a predetermined reference apparatus, enabling consistent layer thickness measurements across different devices and time points.
Solution Approach 2:
The patent uses a reference coordinate system as an intermediary to bridge measurements from different OCT apparatuses. By converting all measurements to this common reference frame, the system enables accurate comparison and follow-up across multiple devices without direct device-to-device calibration.
2Adaptability or versatility
If OCT data from different apparatuses is used for follow-up, then adaptability is improved, but measurement precision deteriorates due to differences in acquisition conditions
Solution Approach 1:
The patent achieves universality by creating a processing system that can handle OCT data from multiple different apparatuses and acquisition conditions. The reference coordinate system approach allows the system to universally process and compare data regardless of the source apparatus, making the follow-up system multi-functional and apparatus-agnostic.
3Loss of time
If raw OCT data is directly compared without correction, then processing time is reduced, but measurement precision deteriorates due to acquisition condition variations
Solution Approach 1:
The patent applies preliminary action by pre-defining a reference coordinate system based on a predetermined reference apparatus. This reference framework is established in advance, allowing subsequent OCT data to be quickly transformed and compared without performing complex real-time corrections, thus reducing processing time while maintaining precision.
Data Source
AI summary
An ophthalmologic information processing apparatus for performing follow-up of a subject eye based on plural pieces of OCT data obtained at different dates includes: a processor; and memory storing computer readable instructions, when executed by the processor, causing the ophthalmologic information processing apparatus to execute: a first acquisition process of acquiring plural pieces of layer thickness information regarding a fundus, the plural pieces of layer thickness information being a processing result of the plural pieces of OCT data of the subject eye; a matching process of matching the pieces of layer thickness information based on the plural pieces of OCT data to each other in consideration of a difference in acquisition condition among the pieces of OCT data; and a display control process of displaying results of the matching of the pieces of layer thickness information on a monitor.