DSA Image Scatter Removal Around Contrast-Filled Tubular Structures
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Solution Overview
Problem
Existing contrast radiation image diagnostic systems, such as angiography apparatus, fail to completely remove unnecessary structures like bones from DSA images due to varying scattered ray components before and after the contrast agent is injected, leading to incomplete removal and hindering accurate blood vessel examination.
Innovation Solution
A radiation image processing device that derives and removes scattered ray components based on the position and concentration of the contrast agent, using coefficients specific to the incidence and emission sides of radiation, and accounts for the behavior of scattered rays in regions with and without the contrast agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contrast agent is injected into the blood vessel to enhance visibility, then the blood vessel structure becomes more distinct, but scattered rays generated in the subject cause unnecessary structures (such as bones) to remain in the DSA image
Solution Approach 1:
The patent segments the scattered ray removal process into two distinct components: a first scattered ray component generated on the radiation incidence side before reaching the contrast agent, and a second scattered ray component generated on the emission side after the radiation passes through the contrast agent. This segmentation allows each component to be modeled and removed separately, improving the accuracy of scattered ray removal while preserving blood vessel visibility.
Solution Approach 2:
The patent applies different scattering models and removal coefficients to different regions of the image based on the local presence and concentration of the contrast agent. By determining scattered ray removal coefficients according to the contrast agent concentration and position, the system optimizes scattered ray removal locally in regions where the contrast agent is present, while maintaining appropriate processing in other regions.
2Device complexity
If scattered rays are removed using a single uniform method, then the processing is simple, but the behavior of scattered rays differs before and after the contrast agent, leading to incomplete removal
Solution Approach 1:
The patent divides the scattered ray removal process into two separate modeling steps: one for scattered rays generated before the contrast agent (incidence side) and another for scattered rays generated after the contrast agent (emission side). Each step uses specific coefficients and models appropriate to that region, improving overall accuracy while maintaining manageable processing complexity through systematic division of the problem.
Solution Approach 2:
The patent changes the parameters used for scattered ray modeling based on the position relative to the contrast agent. By determining different scattered ray removal coefficients according to whether the region is on the incidence side or emission side of the contrast agent, and adjusting these coefficients based on contrast agent concentration, the system optimizes removal accuracy for each region without requiring a completely complex unified model.
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
Accurately removes scattered ray components from images, ensuring clear DSA images by minimizing the presence of overlapping structures, thereby enhancing the accuracy of blood vessel examination and treatment.
Implementation Method 1
the effect of absorbing the scattered rays generated between the radiation source and the blood vessel by the contrast agent is large
Implementation Method 2
an influence of scattered rays generated in a case in which radiation is transmitted through a subject
Data Source
AI summary
A processor is configured to acquire a post-contrast radiation image by performing radiography on the subject including a tubular structure injected with the contrast agent, derive a first scattered ray component on an incidence side of radiation of the subject and a second scattered ray component on an emission side of the radiation of the subject with reference to the tubular structure, and derive a post-contrast processed radiation image by removing the scattered ray component of the post-contrast radiation image based on the first scattered ray component and the second scattered ray component in a region of the tubular structure injected with the contrast agent in the post-contrast radiation image.