DMD-Based Ophthalmic Imaging Contrast Enhancement
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Solution Overview
Problem
Current ophthalmic imaging devices, such as scanning light ophthalmoscopes, struggle to provide adequate contrast and resolution for translucent structures in the eye, particularly due to the discarding of light that does not pass through traditional pinholes, leading to unresolved or weakly contrasted structures.
Innovation Solution
The integration of a digital micromirror device (DMD) in the detection arm, which replaces the pinhole, allowing for the redirection of previously discarded light to multiple detectors, enabling the imaging and comparison of axial and lateral point-spread components of light distribution patterns, thereby enhancing contrast and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a traditional pinhole is used in the detection arm, then the optical path is simple, but light is discarded and contrast is inadequate
Solution Approach 1:
The detection arm is segmented into multiple functional components: a digital micromirror device (DMD) that spatially segments the light distribution pattern into multiple regions, and multiple detectors that separately detect light from each region. This segmentation allows previously discarded light to be captured and utilized, improving contrast without excessive complexity increase.
Solution Approach 2:
The DMD serves multiple functions: it acts as a spatial light modulator to direct different portions of the point-spread function to different detectors, enables dynamic configuration of detection regions, and facilitates mathematical processing of light distribution patterns. This multi-functionality addresses light loss while managing system complexity.
2Measurement precision
If light distribution patterns are discarded, then the detection system is simple, but resolution and contrast of translucent structures are inadequate
Solution Approach 1:
The system transitions from detecting only on-axis light to detecting light in the lateral dimension by analyzing the lateral point-spread function. The DMD spatially separates lateral light distribution components and directs them to multiple detectors, enabling resolution enhancement through lateral dimension analysis without excessive complexity.
Solution Approach 2:
The DMD acts as an intermediary device between the optical path and detectors, enabling mathematical processing of light distribution patterns. It modulates and redirects light to facilitate contrast enhancement through analysis of the point-spread function, achieving improved measurement precision while managing complexity.
3Adaptability or versatility
If mechanical alignment is used for pinholes, then the alignment is precise, but the system requires mechanical adjustment and is less adaptable
Solution Approach 1:
The mechanical pinhole alignment system is replaced with a digital micromirror device that uses electronic control to direct light distribution patterns. This substitution eliminates mechanical adjustment requirements while providing precise and adaptable detection configurations through digital control of mirror facets.
Solution Approach 2:
The detection configuration becomes dynamic through the DMD's ability to electronically reconfigure which mirror facets direct light to which detectors. This dynamic control allows flexible adaptation to different imaging requirements without mechanical adjustment, improving ease of operation while maintaining 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
This approach allows for the visualization of previously unresolved structures by mathematically processing the light distribution patterns, providing enhanced contrast and resolution, and enabling the imaging of complex retinal structures without the need for mechanical alignment, thus improving the imaging capabilities of ophthalmic devices.
Implementation Method 1
The detection arm includes a digital micromirror device (DMD) having an array of mirror facets. The first detector and one or a plurality of additional detectors are disposed to receive a first portion of the axial and lateral point-spread of light distribution of light as reflected by one or more mirror facets of the DMD.
Implementation Method 2
The computer is communicatively coupled to the DMD and adapted to control a plurality of facets of the array of mirror facets so as to direct the first portion of the axial and lateral point-spread of light distribution pattern of light to the first detector and at least another portion of the axial and lateral point-spread of light distribution pattern of light to at least another detector.
Data Source
AI summary
An ophthalmic imaging system for imaging an axial and lateral point-spread of light distribution pattern of light reflected from a surface of an animal or human eye includes an ophthalmic imaging apparatus adapted to generate an illumination light of a surface of the eye. A detection arm includes a digital micromirror device (DMD) having an array of mirror facets. A first detector is disposed to receive a first portion of the axial and lateral point-spread of light distribution of light, and one or a plurality of additional detectors are disposed to receive a light from one or a plurality of different portions of the axial and lateral point-spread of light distribution pattern of light. A detection arm, a method for imaging axial and lateral point-spread of light distribution components, and a method for auto-centering a distribution pattern in an imaging plane of a DMD device are also described.