Ophthalmic OCT Scan Pattern Positioning
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Solution Overview
Problem
Conventional ophthalmic imaging apparatuses have limited degree of freedom in scanning, making it impossible to position the intersection area of scan patterns at desired locations, especially near the boundaries of the scannable area, which restricts the observation of sites of interest and their peripheral areas.
Innovation Solution
An ophthalmic imaging apparatus with a measurement unit for optical coherence tomography, an imaging unit for acquiring moving images, a display controller to show intersecting scan pattern images, and an operation unit to change the relative position of these images, allowing for enhanced scanning flexibility by controlling the optical coherence tomography based on the adjusted scan lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the scan pattern is moved within the scannable area to observe a site of interest, then the observation capability is improved, but the degree of freedom of scanning is reduced when the site is near the boundary
Solution Approach 1:
The scan pattern is divided into multiple independent scan lines that can be positioned and scanned separately. This segmentation allows the system to flexibly adjust which scan lines are active and their positions, enabling observation of sites near boundaries without being constrained by the traditional fixed scan pattern geometry.
Solution Approach 2:
The scan pattern configuration is made dynamic and adjustable rather than fixed. The system allows real-time modification of scan line positions and arrangements, enabling the intersection area to be placed at desired positions including near boundaries, thus increasing scanning freedom while maintaining observation capability.
2Adaptability or versatility
If the scan position is set at the boundary to observe a site of interest, then the accessibility to peripheral sites is improved, but the scan pattern cannot be properly positioned due to hardware constraints
Solution Approach 1:
By segmenting the scan pattern into individual scan lines, the system can selectively position and activate scan lines at boundary areas. This allows the intersection area to be placed at desired boundary positions without being constrained by hardware limitations that prevent proper positioning of traditional fixed scan patterns.
Solution Approach 2:
The system changes the parameters of the scan pattern, allowing flexible adjustment of scan line positions and arrangements. This enables the scan position to be set at boundary areas to observe sites of interest, overcoming the limitation of fixed scan patterns that cannot be properly positioned at boundaries due to hardware constraints.
3Stability of the object's composition
If the scan pattern shape is maintained while moving, then the scan pattern integrity is preserved, but the ability to position the intersection area at desired locations is reduced
Solution Approach 1:
Segmenting the scan pattern into independent scan lines allows each line to be positioned and configured separately. This maintains the functional integrity of the scan pattern while providing the flexibility to position the intersection area at desired locations, including near boundaries, without being constrained by fixed geometric shapes.
Solution Approach 2:
The scan pattern configuration is made dynamic, allowing the shape and position to be adjusted based on observation needs. This enables the system to maintain scan pattern integrity through coordinated adjustment of multiple scan lines while achieving positioning flexibility to place the intersection area at desired locations.
Data Source
AI summary
An ophthalmic imaging apparatus of an embodiment scans a subject's eye with OCT to acquire a cross sectional image. A measurement unit performs OCT. An imaging unit acquires a moving image of the subject's eye. A display controller controls a display device to display the moving image acquired by the imaging unit, and two or more scan pattern images corresponding to two or more scan lines representing scan positions and scan directions in the moving image and arranged such that at least two of the two or more scan pattern images intersect one another. An operation unit is used for changing a relative position between the two or more scan pattern images. A measurement controller controls the measurement unit to perform OCT based on the two or more scan lines corresponding to the two or more scan pattern images after the relative position have been changed.