Tomographic Image Reconstruction with Limited Projection Data
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Solution Overview
Problem
Existing nondestructive inspection techniques face challenges in generating high-accuracy tomographic images quickly from a small number of projection data or with limited projection directions, which limits their effectiveness in defect detection for machine parts and structures.
Innovation Solution
An information processing apparatus and method that acquire projection data from multiple imaging positions with different directions, utilizing attenuation information and scattered radiation to generate tomographic images, including attenuation information for various materials and energy bands, and employing methods like fan and cone beams to enhance image accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of projection data is reduced to improve inspection speed, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent applies parameter changes by utilizing attenuation information (linear attenuation coefficients) of the inspection target material to compensate for the limited number of projection data. By incorporating material-specific attenuation characteristics into the reconstruction process, the system achieves high-accuracy tomographic images from a small number of projection views, thus resolving the contradiction between inspection speed and image accuracy.
2Productivity
If the number of imaging positions is reduced to improve inspection speed, then productivity is improved, but measurement precision deteriorates
Solution Approach 1:
The patent utilizes attenuation information as an additional parameter to enhance the reconstruction accuracy. By incorporating material-specific attenuation coefficients into the tomographic reconstruction algorithm, the system can achieve high-accuracy images from a limited number of imaging positions, thereby improving productivity without sacrificing measurement precision.
3Device complexity
If projection data is limited in projection directions to simplify the inspection system, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent compensates for limited projection directions by incorporating attenuation information into the reconstruction process. By using material-specific attenuation coefficients, the system can accurately reconstruct tomographic images even when projection data is limited to specific directions, thus reducing device complexity while maintaining measurement precision.
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 generation of high-accuracy tomographic images even with limited projection data or directions, improving defect detection speed and accuracy in nondestructive inspections.
Implementation Method 1
acquire projection data corresponding to each of a plurality of imaging positions at which an inspection target is irradiated with radiation from different directions
Implementation Method 2
generate the tomographic image, based on scattered radiation produced by the inspection target
Data Source
AI summary
An information processing apparatus acquires projection data corresponding to each of a plurality of imaging positions at which an inspection target is irradiated with radiation from different directions, such that one piece of projection data is acquired at each of at least two imaging positions among the plurality of imaging positions, and generates a tomographic image of the inspection target, based on the projection data and attenuation information of the inspection target.