X-ray CT Cargo Inspection System for Explosive Detection
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Solution Overview
Problem
Current cargo inspection systems, particularly those using single or multi-view x-ray transmission technology, are inadequate for detecting explosives with low false alarm rates and are inefficient for inspecting large cargo containers, as they lack the capability to penetrate deeply and provide detailed images of contents within large crates, pallets, and containers.
Innovation Solution
An X-ray computed tomography (CT) scanning system is employed, featuring a rotatable platform with a fixed X-ray source and detector array, capable of producing multiple-energy X-ray beams to generate detailed three-dimensional images of cargo contents, including density and atomic number maps, facilitating the detection of explosives, nuclear materials, and fissile materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single or multi-view x-ray transmission technology is used, then the system can detect weapons and blades, but it lacks the capability of detecting explosives with a low false alarm rate
Solution Approach 1:
The patent applies parameter changes by transitioning from single or multi-view x-ray transmission to computed tomography (CT) imaging, which provides quantitative measures of material characteristics including electron density and effective atomic number. This parameter transformation enables reliable explosive detection with low false alarm rates by characterizing material properties rather than relying on simple transmission imaging.
Solution Approach 2:
The patent replaces the mechanical x-ray transmission imaging system with a CT imaging system that reconstructs three-dimensional volumetric images from multiple projection views. This substitution provides quantitative material characterization capabilities that enable reliable explosive detection while maintaining the ability to detect weapons and blades.
2Volume of stationary object
If conventional checked-luggage scanning systems are used, then they can detect explosives in small containers, but they are inadequate for inspecting large cargo containers
Solution Approach 1:
The patent applies dynamics by using a movable platform that can rotate and translate to position the x-ray source and detector array relative to the container. This dynamic positioning system enables CT scanning of large cargo containers while maintaining the detection reliability achieved with smaller checked-luggage containers, as the system can adapt its geometry to accommodate different container sizes.
3Productivity
If manual inspection, canine inspection and trace detection are used, then some cargo containers are inspected, but the process is too time consuming
Solution Approach 1:
The patent replaces manual inspection, canine inspection, and trace detection methods with an automated CT scanning system. This substitution provides both high detection reliability through quantitative material characterization and high productivity through automated operation, eliminating the time-consuming nature of manual inspection methods while maintaining thorough detection capabilities.
4Measurement precision
If NDT CT scanning systems are used, then they can inspect machine parts and jet engines, but the scanning and image reconstruction processes are very slow
Solution Approach 1:
The patent applies dynamics by using a movable platform with coordinated rotation and translation that enables rapid data acquisition for CT scanning. This dynamic scanning approach, combined with modern reconstruction algorithms, maintains the high image quality and quantitative material characterization of NDT systems while significantly improving scanning speed and productivity for cargo inspection applications.
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 system effectively detects small explosives, nuclear materials, and fissile materials with high spatial resolution, reducing false alarms and enabling efficient inspection of large cargo containers without the need for manual disassembly, while also providing a method for passive detection of radioactive materials.
Implementation Method 1
At least one X-ray source is fixedly positioned with respect to the platform and configured to transmit radiation through the object. At least one X-ray detector is fixedly positioned with respect to the platform. The at least one X-ray detector is configured to detect the radiation transmitted through the object
Implementation Method 2
CT provides a quantitative measure of material characteristics, regardless of location or the superposition of objects; a substantial advantage over conventional and multi-view x-ray transmission and radioisotope-based imaging systems. In a CT scanner, a large number of precise x-ray 'views' are obtained at multiple angles. These views are then used to reconstruct planar or volumetric images. The image is a mapping of the x-ray mass attenuation value for each volume element (or voxel) within the imaged volume.
Data Source
AI summary
An X-ray computed tomography scanning system for inspecting an object includes a platform configured to support the object. The platform is rotatable about an axis and movable in a direction parallel to the axis. At least one X-ray source is fixedly positioned with respect to the platform and configured to transmit radiation through the object. At least one X-ray detector is fixedly positioned with respect to the platform. The at least one X-ray detector is configured to detect the radiation transmitted through the object and generate a signal representative of the detected radiation.