Radiographic Image Correction for Overlapping Detector Ends
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Solution Overview
Problem
The existing techniques for non-destructive inspection using radiation struggle with accurately correcting radiographic images due to overlapping end parts of the radiation detection medium, leading to poor correction accuracy and deteriorated image quality.
Innovation Solution
An image processing apparatus that acquires radiographic images from a radiation detector with overlapping end parts and corrects the influence of these end parts, using correction coefficients derived from images captured without a subject or from different portions of the object, to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation detection medium is wound around the pipe to perform non-destructive inspection, then the inspection can be performed on curved surfaces, but the end parts of the radiation detection medium overlap with each other causing poor correction accuracy and deteriorated image quality
Solution Approach 1:
The patent divides the overlapping region into multiple pixel groups based on their distance from the radiation source. Different correction coefficients are applied to different pixel groups, allowing segmented correction of the overlapping region. This resolves the contradiction by enabling curved surface inspection while maintaining image quality through position-specific correction.
Solution Approach 2:
The patent applies different correction coefficients to different regions of the overlapping area based on their local characteristics (distance from radiation source). Instead of uniform correction, each pixel group receives customized correction based on its specific position, improving overall correction accuracy while maintaining the ability to inspect curved surfaces.
2Reliability
If correction is applied to the overlapping portion using existing techniques, then some correction is achieved, but the correction accuracy remains poor and image quality deteriorates
Solution Approach 1:
The patent changes the correction parameter (correction coefficient) based on the distance from the radiation source. By making the correction coefficient a variable parameter rather than a fixed value, the system achieves higher correction accuracy for different regions of the overlapping area, resolving the contradiction between reliability and precision.
Solution Approach 2:
The patent uses pixel values from the overlapping region and non-overlapping region as feedback to calculate appropriate correction coefficients. This feedback mechanism allows the system to adjust correction parameters based on actual image data, improving correction accuracy and image quality.
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
The solution effectively corrects the radiographic images, enhancing their accuracy and quality by accounting for the influence of overlapping end parts and backscattered radiation, resulting in improved non-destructive inspection results.
Implementation Method 1
a radiation detector in which a plurality of pixels each of which outputs an electrical signal according to a dose of radiation emitted from a radiation source
Implementation Method 2
an influence of backscattered radiation caused by the end part on the far side
Data Source
AI summary
Provided are an image processing apparatus, a radiography system, an image processing method, and an image processing program by which a radiographic image can be accurately corrected. An image processing apparatus includes an image acquisition unit that acquires, from a radiation detector in which a plurality of pixels each of which outputs an electrical signal according to a dose of radiation R emitted from a radiation source are arranged, a radiographic image captured in a state in which end parts of the radiation detector overlap with each other; and a correction unit that corrects an influence of the end portion on a far side from the radiation source, which is included in the radiographic image.