Quantitative Phase Tomography Linear Scanning Apparatus
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Solution Overview
Problem
Current methods for quantitative refractive index tomography rely on rotations of the sample or illumination beam, which are mechanically complex and prone to inaccuracies, and typically assume plane wave illumination, limiting the efficiency and resolution of three-dimensional imaging.
Innovation Solution
The apparatus employs a specially shaped illumination with a structured wavefront and linear scanning of the specimen, allowing for direct acquisition of angular information without rotation, using a projection formalism or diffraction theory to reconstruct the three-dimensional distribution of refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation of sample or illumination beam is used to acquire angular information, then tomographic data can be collected, but mechanical complexity increases and measurement precision decreases
Solution Approach 1:
The patent replaces the mechanical rotation system with a static illumination system that uses a shaped wavefront (e.g., annular, conical, or multi-directional beam patterns) to provide angular diversity. The illuminated sample is scanned linearly through the shaped beam, acquiring angular information optically rather than mechanically, thereby eliminating complex rotation mechanisms while maintaining or improving measurement precision.
Solution Approach 2:
The patent changes the illumination parameter from conventional plane waves to specially shaped wavefronts with controlled angular distributions. By engineering the wavefront shape (e.g., using spatial light modulators or shaped aperture masks), the system directly provides the required angular information without mechanical movement, transforming the illumination geometry to match the tomographic reconstruction requirements.
2Productivity
If plane wave illumination is used, then standard reconstruction methods can be applied, but imaging efficiency and resolution are limited
Solution Approach 1:
The patent changes the illumination parameter from conventional plane waves to specially shaped wavefronts (e.g., annular, conical, or multi-directional beams) that directly provide the angular diversity needed for tomography. This transformation of the illumination geometry enables faster data acquisition through linear scanning while improving resolution by capturing higher spatial frequency information through the engineered wavefront shapes.
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 simplifies the data acquisition process, improves mechanical stability, and enables high-resolution three-dimensional imaging by directly obtaining pluri-angle views through linear specimen displacement, overcoming the limitations of traditional methods.
Implementation Method 1
The apparatus relies on a specially shaped illumination, which provides straightforwardly an angular distribution in the illumination of the specimen
Implementation Method 2
coherent and non-coherent detection of beams scattered by a specimen
Implementation Method 3
detection of beams scattered by a specimen
Implementation Method 4
employ more general formalisms considering the diffraction theory, in which case a measurement of the full information of the wave (amplitude and phase) is required for tomographic reconstruction
Data Source
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AI summary
The disclosed invention describes a new apparatus performing a new data acquisition for quantitative refractive index tomography. It is based on a linear scanning of the specimen, opposed to the classical approaches based on rotations of either the sample or the illumination beam, which are based on the illumination with plane waves, which orientation is successively modified in order to acquire angular information. On the contrary, the inventive apparatus and method rely on a specially shaped illumination, which provides straightforwardly an angular distribution in the illumination of the specimen. The specimen can thus be linearly scanned in the object plane in order to acquire the data set enabling tomographic reconstruction, where the different positions directly possess the information on various angles for the incoming wave vectors.