Polychromatic Reflection Matrix Imaging for Bulk Scattering Media
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Solution Overview
Problem
Existing optical microscopy techniques struggle to achieve high-resolution, three-dimensional imaging of biological tissues beyond a few transport mean free paths due to multiple scattering and aberrations, with adaptive optics methods being limited by isoplanatic zones and complex implementation, and previous matrix approaches being restricted to single transverse planes.
Innovation Solution
A method and system using a three-dimensional polychromatic reflection matrix to determine a focused volumetric reflection matrix, allowing for ultra-fast volume characterization of bulk scattering media by correcting axial and transverse distortions, and enabling confocal imaging with diffraction-limited resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If adaptive optics methods are used to correct aberrations, then resolution is improved, but the field of view is limited by isoplanatic zones and device complexity increases
Solution Approach 1:
The patent segments the measurement process into two distinct stages: first measuring the reflection matrix without wavefront correction to capture aberration information, then using this information to synthesize corrected images. This segmentation avoids the need for complex real-time wavefront correction devices while achieving high resolution across the entire field of view.
Solution Approach 2:
The patent creates a virtual copy of the aberrated wavefronts by measuring the reflection matrix and using it to calculate corrected wavefronts numerically. This computational copying approach replaces physical wavefront correction devices, reducing device complexity while maintaining measurement precision.
2Measurement precision
If adaptive optics methods are used to correct aberrations, then resolution is improved, but the field of view remains restricted to isoplanatic zones
Solution Approach 1:
The patent makes the reflection matrix measurement universal by showing that a single measurement can be used to correct aberrations across the entire field of view, not just within limited isoplanatic zones. The measured matrix contains information about aberrations from all directions, enabling comprehensive correction throughout the imaging area.
Solution Approach 2:
By numerically synthesizing corrected wavefronts from the measured reflection matrix, the patent creates virtual copies of aberration-corrected images for the entire field of view, eliminating the restriction to small isoplanatic zones while maintaining high resolution.
3Length of stationary object
If confocal or interferometric microscopy is used to increase penetration depth, then imaging depth is improved, but resolution is still limited by aberrations and multiple scattering
Solution Approach 1:
The patent introduces the reflection matrix as an intermediary that captures information about both the sample structure and the aberrations introduced by the scattering medium. This intermediary measurement enables subsequent computational separation of sample information from aberration effects, achieving high resolution at depth without requiring physical wavefront correction devices.
Solution Approach 2:
The patent creates virtual copies of the original object by numerically back-propagating the measured fields through the measured reflection matrix, effectively removing the degrading effects of aberrations and multiple scattering that accumulate with penetration depth.
4Area of stationary object
If multi-conjugate adaptive optics devices are used to expand the field of view, then coverage is improved, but experimental implementation becomes particularly complex
Solution Approach 1:
The patent replaces the mechanical system of multiple deformable mirrors and complex optical paths required for multi-conjugate adaptive optics with a computational approach. The reflection matrix measurement and subsequent numerical processing provide the same field-of-view expansion function without the mechanical complexity, achieving simplified implementation.
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
Enables ultra-fast, high-resolution, three-dimensional imaging of bulk scattering media by correcting aberrations and multiple scattering, providing optimized contrast and resolution throughout the volume, with improved signal-to-noise ratio and faster acquisition times.
Implementation Method 1
a light wave illuminates the sample, and then the light scattered by the structures in the medium is collected
Implementation Method 2
acquiring, by means of a detector comprising Nout elementary detectors, a second plurality of interference signals, each interference signal resulting from the interference, in a detection plane of the detector, between a wave backscattered by the sample illuminated by said incident light wave and a reference wave from the reference arm
Data Source
AI summary
A method for the optical characterization of a sample, by positioning the sample in a field of view of a first microscope objective located in an object arm of an interferometer; generating, by an illuminating device, a first plurality of Nin incident light waves; for each incident light wave of a given wavefront, acquiring a second plurality Nω of interference signals, each interference signal resulting from the interference between a wave backscattered by the sample and a reference wave, the interference signals acquired according to one example for different Nω frequencies; determining a polychromatic reflection matrix with all of the interference signals acquired for the Nin incident light waves and the Nω frequencies; numerically determining, on the basis of the polychromatic reflection matrix, a focused bulk reflection matrix; determining, on the basis of this first focused bulk reflection matrix, at least one map having a physical parameter of the sample.