Ophthalmologic Imaging Device Automated OCT Operation
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Solution Overview
Problem
Current ophthalmic imaging devices using optical coherence tomography (OCT) require extensive user knowledge and experience for proper operation, making it difficult for individuals without training to perform frequent and necessary checks for conditions like age-related macular degeneration and glaucoma, which necessitates frequent hospital visits and is burdensome for patients.
Innovation Solution
An ophthalmologic imaging apparatus integrating an optical unit, computer, and user interface, allowing for automated setting and operation of OCT measurements, including fixation position, scan patterns, diopter correction, and analysis processes, enabling users with little knowledge to perform tests easily by pre-setting parameters and using a graphical user interface for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If OCT devices use complex scanning mechanisms and multiple optical components to achieve high-resolution imaging, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (scanning, focusing, interference detection) into a single integrated optical path. The Michelson interferometer configuration merges reference light and measurement light paths, while the galvanometer mirror simultaneously performs both beam scanning and interference pattern generation, reducing the number of separate components needed.
Solution Approach 2:
The galvanometer mirror serves multiple functions: it scans the measurement light beam across the sample, generates the interference pattern by modulating the optical path difference, and enables both spectral-domain and swept-source OCT modes. This multi-functionality reduces the need for separate scanning mechanisms and wavelength tuning components.
2Measurement precision
If OCT devices require multiple settings and adjustments for proper operation, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system performs automatic alignment and calibration through the interferometer configuration. The reference light path automatically compensates for optical path differences, and the galvanometer mirror self-adjusts to maintain optimal interference conditions. This eliminates the need for manual alignment procedures that would require trained operators.
Solution Approach 2:
The system allows dynamic switching between spectral-domain OCT and swept-source OCT modes by changing the light source parameters and detection configuration. This enables the device to adapt to different measurement requirements without requiring separate devices or complex manual reconfiguration, making it easier for users to select appropriate measurement modes.
3Measurement precision
If OCT devices perform comprehensive eye examinations with multiple scan patterns, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The galvanometer mirror performs rapid periodic scanning of the light beam across the retinal area, acquiring multiple cross-sectional images in quick succession. This periodic scanning enables comprehensive examination of different retinal layers and structures without requiring prolonged exposure times, maintaining diagnostic accuracy while reducing overall examination duration.
Solution Approach 2:
The interferometric detection system continuously captures interference patterns throughout the scanning process, accumulating data in real-time. This continuous data acquisition allows the system to build complete three-dimensional images of the retina without interruption, eliminating the need for repeated measurements and reducing total examination time while maintaining measurement precision.
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 users with no or little experience to perform OCT measurements and subjective visual acuity tests independently, reducing the need for frequent hospital visits and allowing for more timely and appropriate medication administration, while maintaining accurate diagnostic data.
Implementation Method 1
superimposes the light reflected from the object on reference light to generate interference light
Implementation Method 2
obtains the spectral intensity distribution of the interference light, and applies Fourier transform thereto to acquire an image of the morphology of the object to be measured in the depth direction
Data Source
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AI summary
To provide an ophthalmologic imaging apparatus that enables even those having no or little knowledge and experience about using the apparatus to easily perform a test. An ophthalmologic imaging apparatus of an embodiment includes: an optical system configured to divide light from a light source into measurement light and reference light, cause the measurement light returning from a subject's eye to interfere with the reference light, and detect interference light resulting therefrom; a processor configured to process a detection result of the interference light obtained by the optical system to generate test data indicating the state of the subject's eye; an output unit configured to output the test data generated by the processor; an interface used to make the setting of a predetermined item related to the optical system and the processor; a storage configured to store setting information indicating the content of the setting made through the interface; and a controller configured to control the optical system and the processor based on the content of the setting indicated by the setting information in each of a plurality of tests performed until the setting information is changed or deleted.