Lensless Optical Reconstruction for Cell Internal Structure
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Solution Overview
Problem
Current methods for reconstructing optical properties of diffracting objects, such as cells and bacteria, are not precise enough to distinguish between structures like the nucleus and cytoplasm, especially for objects with diameters less than 50 μm, limiting the obtainable information.
Innovation Solution
A method and system using a spatially coherent light source, a matrix photodetector, and a reconstruction algorithm that measures intensity and reconstructs optical properties at a height lower than the distance between the object and the detector, allowing for the differentiation of optical properties of multiple structures within a single object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional lensless imaging methods are used to reconstruct optical properties of small particles, then the device complexity is reduced, but the measurement precision is insufficient to distinguish internal structures like nucleus and cytoplasm
Solution Approach 1:
The patent introduces a new dimension by performing reconstructions at multiple heights (z-depths) rather than a single plane. By reconstructing optical properties at different axial positions and combining this depth information with lateral resolution, the system achieves 3D visualization of particle internal structures, enabling distinction between nucleus and cytoplasm while maintaining lensless simplicity
Solution Approach 2:
The patent changes the reconstruction parameter from a single fixed height to multiple variable heights. By systematically varying the reconstruction height parameter and processing data from multiple focal depths, the system extracts three-dimensional structural information that reveals internal particle architecture without requiring complex optical components
2Ease of operation
If the reconstruction height is set equal to the distance between the object and the detector, then the reconstruction process is simplified, but the ability to resolve fine internal structures is lost
Solution Approach 1:
The patent performs preliminary reconstructions at multiple heights before final image synthesis. By pre-processing data at various z-positions and identifying structural features at different depths, the system prepares optimized depth information that enhances the final reconstructed image quality and structural resolution
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 the reconstruction of optical properties with higher precision, allowing for the distinction between structures like the nucleus and cytoplasm, and the observation of a large number of objects simultaneously, with results comparable to microscopic observations.
Implementation Method 1
the measurement, by the matrix photodetector, of an intensity of at least one diffraction pattern transmitted by the illuminated medium in a vertical direction, the diffraction pattern or patterns corresponding to waves diffracted by one or more diffracting objects during the illumination of the medium
Implementation Method 2
a matrix photodetector... capable of forming an image of the medium while being placed at a short distance from it
Data Source
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AI summary
This method of reconstructing optical properties of diffracting objects (22) bathed in a liquid medium (24) is implemented with the aid of a reconstruction system (20) comprising a spatially coherent light source (26) and a matrix photodetector (28), the liquid medium (24) being delimited by a transparent surface (42), the diffracting objects (22) being in contact with the surface (42). The reconstruction method comprises the lighting of the medium (24) with the spatially coherent light source (26); the measurement, by the matrix photodetector (28), of an intensity of a diffraction pattern transmitted by the lit medium (24) in a vertical direction (Z); and the reconstruction of the optical properties of the objects (22) at a reconstruction height (Zr), according to a reconstruction algorithm based on the measured intensity. During the reconstruction step, the reconstruction height exhibits a value strictly lower than that of the distance (D2) between the medium (24) and the matrix photodetector (28) in the vertical direction (Z), preferably lower than 0.9 times said distance (D2), more preferably still lower than 0.8 times said distance (D2).