Wavefront-Shaped Imaging Through Scattering Media for 3D Reconstruction
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Solution Overview
Problem
Existing imaging techniques face challenges in achieving high-resolution imaging through scattering media, such as biological tissues, due to scattering-induced speckle formation and the need for complex feedback mechanisms or prior knowledge of scattering properties, limiting effective 3D reconstruction of objects behind such media.
Innovation Solution
A reflection-mode imaging system utilizing a spatial light modulator (SLM) to optimize wavefront patterns of coherent illumination based on measured amplitude and phase data, enabling simultaneous imaging at multiple focal planes and locations, reducing the need for scanning and providing 3D structure reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging techniques are used to image through scattering media, then the imaging process is simple, but the image resolution deteriorates due to scattering-induced speckle formation
Solution Approach 1:
The patent applies preliminary action by pre-optimizing wavefront patterns using measured amplitude and phase data before actual imaging. The system performs wavefront optimization in advance to compensate for scattering effects, allowing high-resolution imaging without requiring complex real-time feedback mechanisms during the imaging process itself.
Solution Approach 2:
The patent uses copying by creating optimized wavefront patterns that replicate the ideal illumination conditions. The spatial light modulator generates wavefronts that are copies of the optimal patterns determined through optimization, enabling consistent high-resolution imaging across multiple measurements without repeating the complex optimization process.
2Measurement precision
If wavefront optimization is performed for each focal plane and location, then imaging accuracy improves, but the time required for scanning increases
Solution Approach 1:
The patent applies partial action by performing wavefront optimization selectively for each focal plane and location rather than for all possible planes simultaneously. This partial optimization approach achieves sufficient imaging accuracy for each plane while avoiding the excessive time cost of comprehensive optimization across the entire 3D space, balancing precision and efficiency.
3Measurement precision
If complex feedback mechanisms are used to image through scattering media, then image quality improves, but the system complexity and prior knowledge requirements increase
Solution Approach 1:
The patent applies self-service by using the scattered light itself to carry the optimization information back to the spatial light modulator. The system measures amplitude and phase data from the scattered light and uses this information to automatically adjust the wavefront patterns, eliminating the need for external feedback mechanisms or prior knowledge of the scattering properties.
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 high-resolution, depth-resolved imaging through scattering media by optimizing wavefront patterns for each focal plane and location, significantly reducing scanning requirements and improving imaging accuracy.
Implementation Method 1
A reflection-mode imaging system utilizing a spatial light modulator (SLM) to optimize wavefront patterns of coherent illumination
Implementation Method 2
wavefront patterns of coherent illumination based on measured amplitude and phase data
Implementation Method 3
measured amplitude and phase data... enabling simultaneous imaging at multiple focal planes and locations
Implementation Method 4
enabling simultaneous imaging at multiple focal planes and locations, reducing the need for scanning
Data Source
AI summary
A system is presented for imaging objects through scattering medium. The system includes an imaging system including: light source generating input light forming coherent illumination of selected wavelength range(s); beam shaping unit generating selectively varying wavefront patterns of the input light forming wavefront shaped coherent illumination propagating through the scattering medium to an object region; interferometric unit; and detection unit comprising pixelated detector(s) detecting output light originated at said object being illuminated and passed through said scattering medium, and generating measured data comprising amplitude and phase of the output light and image data about the object. Beam shaping controller analyzes the measured data and generates operational data to the beam shaping unit to produce optimized wavefront shaped coherent illumination comprising multiple illumination spots focused on different focal planes at the object region and different lateral locations in each focal plane, to extract 3D structure of the object from image data.