Talbot Interferometer Grating for Multi-Directional Phase Contrast
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Solution Overview
Problem
Conventional X-ray fluoroscopic images struggle to achieve sufficient sensitivity for materials with low atomic numbers, such as biological soft tissues and organic materials, due to limited contrast, and existing phase-contrast X-ray imaging techniques require complex and costly setups with precise component positioning, limiting field of view and directional information acquisition.
Innovation Solution
An X-ray image generation device utilizing a Talbot interferometer with multiple gratings having different cyclic directions, where the object is moved relative to the gratings to generate moiré interference fringes with cyclic intensity fluctuations, allowing for phase-contrast information acquisition in multiple directions without the need for complex component positioning, thus expanding the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional X-ray fluoroscopic imaging is used, then the imaging process is simple, but the sensitivity and contrast for low atomic number materials are insufficient
Solution Approach 1:
The patent changes the imaging parameter from absorption contrast to phase contrast by introducing a Talbot interferometer. This parameter change enables high sensitivity detection of low atomic number materials by measuring phase shifts in X-rays rather than absorption, achieving three-digit sensitivity improvement while maintaining practical applicability through the interferometer configuration
2Adaptability or versatility
If phase-contrast X-ray imaging is implemented using existing techniques with multiple gratings and offset regions, then phase-contrast information can be acquired in multiple directions, but the number of components increases and precise positioning is required
Solution Approach 1:
The patent segments the grating structure into multiple regions (first region, second region, third region, etc.) within a single Talbot interferometer. Each region has gratings with different cyclic directions, allowing phase-contrast information to be acquired in multiple directions without requiring multiple complete interferometer sets or complex offset configurations
Solution Approach 2:
The Talbot interferometer is designed to perform multiple functions simultaneously: it acquires phase-contrast information in multiple directions (first direction, second direction, third direction) within a single device configuration, eliminating the need for separate imaging systems for different directions
3Ease of operation
If the object is moved relative to the grating part in a single direction, then the imaging process is simple, but phase-contrast information is acquired in only one direction
Solution Approach 1:
The patent adds dimensional diversity by incorporating gratings with different cyclic directions (first cyclic direction, second cyclic direction, third cyclic direction) within the same imaging path. This allows the system to capture phase-contrast information in multiple directions without adding complex mechanical movements or rotating components
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
Facilitates the acquisition of phase-contrast information in a large field of view and multiple directions without rotating the object, simplifying device configuration and maintaining high sensitivity, while minimizing unnecessary X-ray emission and artifact removal requirements.
Implementation Method 1
a grating part 2 including a plurality of gratings constituting a Talbot interferometer... moiré interference fringes generated by transmission through an X-ray interferometer
Implementation Method 2
moiré interference fringes generated in each of all the N regions have a cyclic intensity fluctuation measurable by the detector
Implementation Method 3
X-rays are widely used as probes for viewing the inside of an object... by utilizing the properties as waves in X-rays
Implementation Method 4
phase-contrast X-ray imaging... enhance the contrast of a low-absorbency sample as compared to that of a conventional absorption contrast image
Implementation Method 5
a detector 3 configured to detect the X-rays having passed through the grating part 2 as an X-ray intensity distribution image
Data Source
AI summary
An X-ray image generation device includes a moving mechanism that moves an object relative to a grating part in a direction crossing X-rays emitted toward the grating part. The grating part includes N (2≤N) regions along the direction of movement by the moving mechanism. A cyclic direction of a grating structure in each of the plurality of gratings belonging to an ith (1≤i≤N−1) region out of the N regions and a cyclic direction of a grating structure in each of the plurality of gratings belonging to an (i+1)th region out of the N regions are different directions. The plurality of gratings are configured so that moiré interference fringes generated in the N regions have a cyclic intensity fluctuation measurable by the detector and of at least one cycle or more in the direction of movement by the moving mechanism.