X-ray Contrast Control via Dynamic Beam Filter Adjustment
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Solution Overview
Problem
Current X-ray inspection systems lack the ability to effectively control image contrast, particularly for detecting threats hidden behind metal obscurants, which hinders the operator's ability to identify contraband and optimize scanning throughput.
Innovation Solution
An X-ray inspection system with multiple beam filters of varying thicknesses, where the position of these filters can be adjusted based on user input to achieve desired contrast levels, combined with nonlinear transfer functions for image processing to enhance contrast and edge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If beam filters are used to reduce radiation dose and remove low energy photons, then radiation dose is reduced and image noise is decreased, but image contrast is reduced making it difficult to detect threats behind metal obscurants
Solution Approach 1:
The system dynamically switches between different beam filter configurations based on inspection needs. Multiple beam filters with different thicknesses and materials are employed, allowing the system to adjust the beam spectrum in real-time to optimize both dose reduction and contrast enhancement for different inspection scenarios
Solution Approach 2:
The system changes physical parameters of the X-ray beam by using different beam filters with varying thicknesses and materials (e.g., aluminum, copper, tin). This allows modification of the beam energy spectrum to achieve optimal contrast for detecting threats behind metal obscurants while maintaining dose reduction benefits
2Manufacturing precision
If beam filters are used to enhance image contrast for threat detection, then detectability of threats behind metal is improved, but radiation dose increases and scanning throughput decreases
Solution Approach 1:
The system applies beam filtration selectively and partially - using only the necessary filter thickness and material composition required to achieve adequate contrast for threat detection, rather than applying excessive filtration that would unnecessarily reduce throughput. The system finds the optimal balance point where sufficient contrast is achieved with minimal impact on scanning speed
3Adaptability or versatility
If multiple beam filters of varying thicknesses are implemented to provide contrast control, then image contrast adjustment capability is improved, but device complexity increases
Solution Approach 1:
The multiple beam filters serve multiple functions simultaneously: they provide contrast adjustment capability, optimize beam spectrum for different inspection scenarios, reduce radiation dose, and enhance detectability of various threat types. This multi-functionality justifies the added complexity by delivering comprehensive performance improvements across multiple parameters
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
This solution enhances the detectability of threats by optimizing image contrast, allowing operators to adjust settings for improved detection quality and throughput while reducing radiation dose and noise.
Implementation Method 1
A beam filter limits the overall dose of the X-ray beam by limiting the flux and the lowest energy portion of the X-ray beam spectrum
Implementation Method 2
an X-ray source configured to generate an X-ray beam for irradiating the object
Implementation Method 3
a detector array adapted to receive radiation, originating from the X-ray beam, that is transmitted through, or scattered from, the object and to generate data representative of at least one image
Data Source
AI summary
An X-ray inspection system for scanning objects and providing corresponding contrast controlled scan images is provided. The system includes an X-ray source configured to generate an X-ray beam for irradiating the object where the X-ray source is coupled with at least a first beam filter having a first thickness and a second beam filter having a second thickness greater than the first thickness, a detector array, a processing unit, a user interface configured to receive a user input indicative of a desired level of contrast in an image, and a controller configured to adjust a position of at least one of the first or second beam filters based on the user input indicative of the desired level of contrast in the at least one image.