Radiography Grid Removal Using Pseudo Image Generation
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Solution Overview
Problem
In radiography systems, capturing images with two radiation detectors results in reduced radiation reaching the emission-side detector, making it difficult to appropriately extract grid information for image processing, leading to inadequate removal of grid images from radiographic images.
Innovation Solution
A radiography system comprising a first radiation detector, a second radiation detector stacked on the emission side, and a grid for removing scattered radiation, along with an acquisition unit and a removal unit that generates a pseudo grid image from the first grid image to remove the grid image from the second radiographic image, using deviation and enlargement ratio calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grid is provided to remove scattered radiation, then image quality is improved, but grid images appear in radiographic images requiring complex removal processing
Solution Approach 1:
The patent performs preliminary actions by capturing images with both first and second radiation detectors before the grid removal processing is needed. The first radiographic image (with stronger grid signal) is used to generate a pseudo second grid image that predicts what the grid should look like in the second detector's image, enabling accurate grid removal without requiring direct detection of the grid in the second detector.
Solution Approach 2:
The patent creates a copy of the grid image from the first radiographic image to use as a reference for removing the grid from the second radiographic image. By generating a pseudo second grid image based on the first grid image and adjusting for geometric differences, the system can accurately remove the grid pattern from the second detector's image even though the grid signal is weaker.
2Adaptability or versatility
If two radiation detectors are stacked to capture radiographic images, then dual-energy imaging capability is improved, but radiation reaching the emission-side detector is reduced
Solution Approach 1:
The patent applies local quality by using different radiation detectors with different characteristics for different purposes. The first radiation detector (with stronger grid signal) is optimized for capturing grid information, while the second radiation detector (stacked on emission side) is optimized for dual-energy imaging capability. Each detector is utilized according to its local strengths despite the reduced radiation quantity.
Solution Approach 2:
The patent uses the first radiographic image as an intermediary to bridge the information gap caused by reduced radiation at the second detector. The first grid image serves as a mediator that contains sufficient grid pattern information to generate a pseudo second grid image, which then guides the removal process for the second radiographic image, compensating for the weaker signal.
3Reliability
If grid removal processing is performed on radiographic images with weak grid signals, then image quality is improved, but processing accuracy deteriorates
Solution Approach 1:
The patent performs preliminary action by capturing the first radiographic image with strong grid signal before processing the second radiographic image. This preliminary capture of grid information allows the system to generate accurate pseudo second grid images that can guide the removal process, ensuring high processing accuracy even when the second detector's grid signal is weak.
Solution Approach 2:
The patent creates a copy of the grid pattern information from the first radiographic image and adapts it to match the second radiographic image's geometric characteristics. By generating a pseudo second grid image that replicates the expected grid pattern in the second detector's coordinate system, the system achieves accurate grid removal without requiring direct detection of the weak grid signal.
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 appropriate image processing for radiographic images even when radiation to the second detector is less than the first, effectively removing grid images and improving image quality.
Implementation Method 1
a conversion element that generates a larger amount of charge as it is irradiated with a larger amount of radiation
Implementation Method 2
a grid that removes scattered radiation included in the radiation transmitted through a subject
Data Source
AI summary
A radiography system includes: a radiography apparatus including a first radiation detector and a second radiation detector which is provided so on a side of the first radiation detector from which the radiation is transmitted and emitted, and a grid that is configured to remove scattered radiation included in the radiation transmitted through a subject; and an acquisition unit that is configured to acquire, using the grid, a first radiographic image captured by the first radiation detector and a second radiographic image captured by the second radiation detector; and a removal unit that is configured to detect and remove a first grid image, which is an image of the grid, from the first radiographic image acquired by the acquisition unit, and to remove the image of the grid from the second radiographic image acquired by the acquisition unit, using the first grid image.