Dual Angle X-ray Scanning for Cargo HANM Identification
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Solution Overview
Problem
Current X-ray scanning systems face challenges in accurately distinguishing between high-density, high-atomic-number materials (HANMs) and shielding materials within cargo containers, leading to false positives and unnecessary delays, as the two-dimensional X-ray images cannot reliably differentiate between small regions of high-density nuclear materials and larger regions of moderate or low-density innocuous materials.
Innovation Solution
Scanning objects at least two different angles to determine if high-density regions are due to nuclear materials or shielding materials, with the second scan providing additional perspective on the size and density of suspect regions, allowing for more accurate identification of HANMs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-angle X-ray scanning is used to inspect cargo containers, then scanning speed is maintained, but accuracy of distinguishing HANMs from shielding materials deteriorates due to false positives
Solution Approach 1:
The patent applies multi-angle scanning to capture radiographic images from different perspectives (e.g., 0 degrees, 45 degrees, 90 degrees). By adding the angular dimension to the scanning process, the system distinguishes between HANMs and shielding materials that appear similar in single-angle images, thereby improving identification accuracy without significantly increasing processing time through automated analysis algorithms.
Solution Approach 2:
The patent segments the identification process into multiple stages: initial single-angle screening to identify suspect regions, followed by targeted multi-angle scanning only of those regions. This segmentation allows the system to maintain high scanning speed for most cargo while applying enhanced multi-angle verification only where needed, resolving the contradiction between accuracy and processing time.
2Measurement precision
If multi-angle scanning is implemented to distinguish HANMs from shielding materials, then identification accuracy improves, but system complexity increases
Solution Approach 1:
The patent employs a universal analysis algorithm that processes radiographic images from multiple angles using the same computational framework. This multi-functional approach handles both simple single-angle cases and complex multi-angle cases uniformly, improving accuracy while avoiding the need for separate specialized systems for different scanning configurations.
Solution Approach 2:
The patent uses computational copying techniques where the analysis algorithm virtually reconstructs and compares object structures from multiple angles without requiring physical duplication of scanning hardware. This allows accurate HANM identification through software-based multi-perspective analysis, reducing device complexity while maintaining measurement precision.
3Reliability
If automated analysis algorithms are used to process multi-angle images, then false positives are reduced, but processing time increases
Solution Approach 1:
The patent implements partial automated analysis where the full multi-angle processing pipeline is applied selectively only to suspect regions identified in initial screening, rather than processing every cargo container with complete multi-angle analysis. This partial application maintains high reliability for identified threats while preserving overall throughput by using expedited processing for non-suspect cases.
Solution Approach 2:
The patent performs preliminary single-angle screening to identify suspect regions before applying computationally intensive multi-angle automated analysis. This preliminary action filters out obvious non-threats early in the process, allowing the system to maintain high throughput while dedicating full automated analysis resources only to cases where reliability is most critical.
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 method reduces false positives and increases the accuracy of identifying HANMs, enabling faster processing of cargo containers by distinguishing between nuclear materials and shielding materials, thereby enhancing the reliability of X-ray scanning systems.
Implementation Method 1
Radiation transmitted through the object, which is attenuated to varying degrees by the contents, dependent on the densities of the materials through which the radiation beam passes, is detected.
Implementation Method 2
an X-ray source to scan at least a portion of an object at first and second, different angles
Data Source
AI summary
In one example, a method of examining contents of an object is disclosed comprising scanning an object by first and second radiation beams at least first and second angles, detecting radiation at the first and second angles, and determining whether the object at least potentially comprises high atomic number material, which may be nuclear material or shielding material, based, at least in part, on the detected radiation. In one example, the detected radiation at both angles must be indicative of a region of high atomic number material by the presence of corresponding high density regions, in order for it to be concluded that high atomic number material that may be nuclear material may be present. The determination may be further based on the size of a high density region in one of the images. Systems are also disclosed.