Retinal Imaging System Correcting Anterior and Phase Aberrations
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Solution Overview
Problem
Current ophthalmic diagnostic systems face challenges in achieving ultra-high-resolution imaging of retinal tissue due to refractive errors introduced by anterior eye components and retinal tissue, which degrade the signal-to-noise ratio and limit imaging resolution.
Innovation Solution
The system employs subassemblies with specific light sources and sensors to measure and correct anterior optical aberrations and phase aberrations using wavefront sensors and interferometers, respectively, to generate an imaging light beam with a broad bandwidth for Fourier domain OCT, enabling effective removal of refractive errors and achieving resolutions below 5 microns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional OCT imaging is used, then imaging of retinal tissue is achieved, but refractive errors from anterior eye components and retinal tissue degrade the signal-to-noise ratio and limit imaging resolution
Solution Approach 1:
The system performs preliminary wavefront sensing to measure optical aberrations before the actual OCT imaging. The measured aberrations are then used to pre-correct the imaging beam through adaptive optics, ensuring that the beam is properly focused when it reaches the retinal tissue, thereby achieving ultra-high resolution imaging
Solution Approach 2:
The system employs a feedback mechanism where wavefront sensors continuously measure optical aberrations in the imaging path, and this information is fed back to adaptive optics elements (such as deformable mirrors or liquid crystal modulators) that dynamically adjust the wavefront to compensate for the measured aberrations, maintaining optimal imaging conditions
2Measurement precision
If multiple subassemblies and light sources are used for aberration correction, then refractive errors are removed and imaging resolution improves, but device complexity increases
Solution Approach 1:
The imaging system is divided into distinct functional subassemblies: a wavefront sensing subassembly for measuring aberrations, an adaptive optics subassembly for correcting aberrations, and an OCT imaging subassembly for acquiring images. This segmentation allows each component to be optimized independently and facilitates modular design and implementation
Solution Approach 2:
The system uses a single adaptive optics element (such as a deformable mirror) that serves multiple functions: it corrects aberrations for different wavelengths of light used in OCT imaging, and can be controlled based on wavefront measurements from the same or different light sources, reducing the need for separate correction mechanisms for each wavelength
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
This approach allows for high-resolution imaging of retinal tissue cells with improved signal-to-noise ratio, enabling easy, cost-effective, and precise imaging of cells as small as 10 microns in size, enhancing the capability for ultra-high-resolution OCT imaging.
Implementation Method 1
a first subassembly measures anterior optical aberrations introduced by anterior components of the eye into an imaging light beam
Implementation Method 2
a second subassembly measures phase aberrations introduced by retinal tissue into the imaging light beam
Implementation Method 3
The system employs subassemblies with specific light sources and sensors to measure and correct anterior optical aberrations and phase aberrations using wavefront sensors and interferometers
Implementation Method 4
in the Fourier domain (i.e. frequency domain), OCT techniques can again be used on backscattered light. This time, however, rather than using an interferometer and a Hartmann-Shack sensor for wavefront analysis as is done in a time domain analysis; in the Fourier domain, OCT techniques typically use a spectrometer that evaluates frequency distributions in the light beam
Data Source
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AI summary
A system and method for imaging tissue cells at a predetermined depth in the retina of an eye include components that provide for compensation of refractive errors. Specifically, the system basically includes three subassemblies that operate in concert with each other. There is a first subassembly for directing a first light beam into the eye to measure anterior optical aberrations. There is also a second subassembly for directing a second light beam through retinal tissue to a predetermined depth where the tissue cells are located. This second light beam is used to measure phase aberrations introduced by the retinal tissue. And, there is a third subassembly for directing a third light beam to the tissue cell to produce an image of the tissue cell. In the third light beam, the anterior optical aberrations and the phase aberrations have been substantially removed to provide a clearer image of the tissue cell.