Partial-Field Frequency-Domain Imaging for High-Speed Retinal OCT
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Solution Overview
Problem
Current point-scanning optical coherence tomography (OCT) systems for ophthalmology are limited by low illumination power, low detection efficiency, and susceptibility to motion artifacts due to slow acquisition speeds, which are exacerbated by the need for high-resolution, high-speed imaging of the human retina.
Innovation Solution
Implementing partial-field frequency-domain interferometric imaging systems that utilize a spatially resolved detector with fewer photosensitive elements, allowing for high-speed scanning and reduced data rates, combined with computational adaptive optics for aberration correction and motion compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If point-scanning OCT systems are used to achieve high-resolution imaging, then imaging resolution is improved, but acquisition speed deteriorates leading to motion artifacts
Solution Approach 1:
The patent segments the detection process by using a spatially resolved detector that simultaneously detects light from multiple transverse locations, rather than scanning point-by-point. This parallel detection approach maintains high resolution while dramatically increasing acquisition speed to freeze motion artifacts.
Solution Approach 2:
The patent transitions from one-dimensional point scanning to two-dimensional spatially resolved detection. By detecting light from multiple transverse locations simultaneously across the sample, the system achieves both high resolution and high speed imaging without motion artifacts.
2Object-affected harmful factors
If point-scanning OCT systems illuminate the retina with low power spread over larger area, then safety is improved, but detection efficiency deteriorates
Solution Approach 1:
The patent applies local quality by concentrating illumination power at each transverse location while detecting from multiple locations simultaneously. This allows high local illumination power for efficient detection while the overall power distribution remains safe for retinal imaging.
Solution Approach 2:
The patent merges multiple detection channels into a single spatially resolved detector that simultaneously captures light from multiple transverse locations. This combining of parallel detection paths improves overall detection efficiency while maintaining safe illumination levels.
3Reliability
If point-scanning OCT systems operate close to maximum permissible exposure, then detection efficiency is improved, but system complexity increases due to aberration correction needs
Solution Approach 1:
The patent implements feedback through computational adaptive optics that measures and corrects optical aberrations in real-time. This feedback mechanism enables the system to operate at higher illumination powers for improved detection efficiency while automatically compensating for aberrations that increase system complexity.
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
Enhances imaging resolution and efficiency by enabling higher illumination powers, improved detection efficiency, and reduced motion artifacts, facilitating real-time high-resolution 3D imaging of the retina with manageable data rates.
Implementation Method 1
determines the scattering profile of a sample along the OCT beam by detecting the interference of light reflected from a sample and a reference beam
Implementation Method 2
the broadband interference between reflected sample light and reference light is acquired in the spectral frequency domain and a Fourier transform is used to recover the depth information
Implementation Method 3
combined with computational adaptive optics for aberration correction and motion compensation
Data Source
AI summary
Systems and methods for improved interferometric imaging are presented. One embodiment is a partial field frequency-domain interferometric imaging system in which a light beam is scanned in two directions across a sample and the light scattered from the object is collected using a spatially resolved detector. The light beam could illuminate a spot, a line or a two-dimensional area on the sample. Additional embodiments with applicability to partial field as well as other types of interferometric systems are also presented.