Multi-Scanner X-Ray Inspection for Obscured Explosive Detection
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Solution Overview
Problem
Conventional x-ray scanning systems, including multi-scanner systems, face high false alarm rates when detecting explosive materials, especially when these materials are obscured by other objects or materials with similar effective atomic numbers, leading to missed detections.
Innovation Solution
A method and system utilizing multiple scanners to acquire and analyze scan data from both CT and multi-energy x-ray scanners, generating transform data and identifying regions to determine the presence of candidate materials by comparing scan data subsets, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-scanner systems (CT or multi-energy x-ray) are used for explosive detection, then the system structure is simple and operation is straightforward, but false alarm rate is high and detection accuracy deteriorates when explosive materials are obscured by other objects
Solution Approach 1:
The patent combines multiple scanner systems (CT scanner and multi-energy x-ray scanner) into a unified inspection system. The CT scanner provides absorption coefficient maps while the multi-energy x-ray scanner provides effective atomic number maps. By merging the data from both scanners and analyzing them together, the system achieves higher detection accuracy for obscured explosive materials compared to using either scanner alone, while distributing the complexity across two specialized subsystems rather than one complex system.
2Reliability
If multiple scanners are used to improve detection accuracy and reduce false alarms, then measurement precision improves, but device complexity increases
Solution Approach 1:
The inspection system is segmented into two specialized scanner subsystems: a CT scanner for absorption coefficient measurement and a multi-energy x-ray scanner for effective atomic number measurement. Each scanner is optimized for its specific function, and the segmentation allows independent optimization of each subsystem while achieving superior overall detection reliability through complementary data fusion.
Solution Approach 2:
The system introduces a data processing and analysis module that acts as an intermediary between the multiple scanners and the final detection output. This intermediary processes the raw data from both scanners, generates absorption coefficient maps and effective atomic number maps, compares them against reference data, and produces the final detection result. This mediator manages the complexity of coordinating multiple scanners while enhancing detection reliability.
3Productivity
If scan speed is increased to improve productivity, then throughput increases, but false alarm rate increases and detection precision deteriorates
Solution Approach 1:
The system performs preliminary actions by acquiring data from multiple scanners simultaneously or in rapid sequence before final analysis. The CT scanner and multi-energy x-ray scanner collect their respective data sets during the same scan pass, creating pre-processed absorption coefficient maps and effective atomic number maps that are ready for immediate comparison. This preliminary data collection at high speed enables maintaining throughput while ensuring precise detection through multi-parameter analysis.
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 improves detection accuracy by analyzing multiple data sets from different scanners, reducing false alarms and ensuring that explosive materials are correctly identified even when obscured, thereby enhancing security screening processes.
Implementation Method 1
expose the item to x-rays and to measure the amount of radiation absorbed by the item
Implementation Method 2
in a computed tomography (CT) system, the source and detector are conventionally arranged in a rotating manner and multiple sets of projection data can be collected at various projection angles
Implementation Method 3
in a multi-energy x-ray system, the source can emit x-ray radiation over a continuous spectrum of energies, and the detector can measure multiple sets of projection data at multiple energy ranges within that continuous spectrum
Data Source
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AI summary
A method of analyzing a target item utilizing multiple scanners is disclosed. The method can include providing an item comprising a material. The method can further include acquiring a first set of scan data associated with the item using a first scanner, and acquiring a second set of scan data associated with the item using a second scanner. The method can further include generating a first set of transform data from the first set of scan data, analyzing the first set of transform data to identify a subset of the first set of transform data associated with a first region, and analyzing the second set of scan data to identify a subset of the second set of scan data associated with a second region. The method can also include generating a measure that at least a portion of scan data is consistent with a presence of a candidate material in the item, where the portion of scan data is selected from at least one of the set consisting of: the subset of the first set of transform data and the subset of the second set of scan data.