Triple-Band Fundus Auto-Calibration for Robotic OCT Alignment
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Solution Overview
Problem
Robotic OCT systems face challenges in achieving precise ocular alignment at short distances and accommodating varying refractive errors, hindering broad scan coverage and effective imaging for individuals with cognitive or physical impairments.
Innovation Solution
A triple-band optical auto-calibration fundus imaging device with a central optical path and dual infrared cameras for facial and ocular alignment, combined with an OCT sample arm for vertical adjustment, and a visual induction display for gaze guidance, enabling precise alignment and adaptive scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the working distance is reduced to achieve broader scan coverage, then the scan coverage is improved, but the ocular alignment precision deteriorates
Solution Approach 1:
The patent divides the optical system into multiple independent calibration modules (first intermediate optical calibration module and second intermediate optical calibration module) positioned at different locations in the optical path. Each module independently corrects alignment errors, allowing the system to maintain precise ocular alignment even at reduced working distances while achieving broader scan coverage.
2Measurement precision
If manual operation is used to achieve precise ocular alignment, then the alignment precision is improved, but the operator dependency increases
Solution Approach 1:
The patent implements an automated calibration system that performs ocular alignment without operator intervention. The first and second intermediate optical calibration modules automatically adjust the optical path to achieve precise alignment between the OCT imaging system and the patient's eye, eliminating the need for skilled operators to manually adjust mechanical components while maintaining high alignment precision.
3Reliability
If fixed scanning protocols are used to maintain imaging quality, then the imaging quality is improved, but the adaptability to varying refractive errors deteriorates
Solution Approach 1:
The patent employs dynamically adjustable optical calibration modules that can adapt to different refractive errors (myopia, hyperopia, astigmatism). The calibration modules modify the optical path in real-time based on the patient's specific refractive profile, allowing the system to maintain high imaging quality across diverse patient populations without requiring fixed scanning protocols or mechanical restraints.
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
The device achieves precise ocular alignment and adaptive scanning, facilitating high-quality OCT imaging for diverse refractive profiles and reducing operator dependency, enhancing imaging precision and accessibility for individuals with varying visual acuities.
Implementation Method 1
the short-pass dichroic mirror separates the OCT imaging beam from eye-reflected light
Implementation Method 2
the long-pass dichroic mirror separates the inducing light from eye-reflected light
Implementation Method 3
a fundus lens
Implementation Method 4
a two-dimensional galvanometer system
Data Source
AI summary
The invention discloses a triple-band optical auto-calibration fundus imaging apparatus and method for robotic ophthalmic OCT imaging, comprising: a central optical path including a fundus lens, short-pass dichroic mirror, intermediate optical calibration module I, long-pass dichroic mirror, intermediate optical calibration module II, and infrared camera; two lateral infrared cameras disposed at specific angles relative to the central optical path; an annular light ring surrounding the fundus lens; a visual induction display positioned below the long-pass dichroic mirror; an OCT sample arm with electric lift control; and an OCT optical path beneath the short-pass dichroic mirror. The apparatus captures facial, ocular, and gaze direction data, directing OCT beams through the pupil, eliminating the need for head fixation during robotic ophthalmic OCT imaging. Visual guidance reduces gaze-induced artifacts and automatically adjusts the OCT optical path to accommodate different visual acuities, enhancing robotic ophthalmic imaging efficiency and quality.