Dual-Thickness Detector Regions for Cargo Scanning Material Differentiation
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Solution Overview
Problem
Current cargo scanning systems using X-ray scanners face challenges in effectively distinguishing between different materials, particularly at high energies, due to the limitations of single-energy profile radiation and conventional detector configurations, which struggle to provide comprehensive information about the energy distribution and material composition of objects.
Innovation Solution
A scanning method and system that utilize dual detector regions with different thicknesses to detect radiation after interaction with an object, employing multiple energy profiles (e.g., high and low energy X-ray radiation) to calculate ratios that determine object information using a least squares minimization technique, allowing for more accurate material differentiation and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-energy profile radiation is used in conventional X-ray scanners, then the system complexity is reduced, but the ability to differentiate between materials and obtain comprehensive energy distribution information deteriorates
Solution Approach 1:
The detector is segmented into multiple detector regions (first detector region and second detector region) that can detect radiation at different energy levels. This segmentation allows the system to capture comprehensive energy distribution information without requiring multiple separate scanning systems, thus improving material differentiation while maintaining reasonable system complexity.
Solution Approach 2:
The invention transitions from single-energy detection to multi-energy detection by adding the energy dimension to the detection process. By using detector regions with different thicknesses and arrangements, the system captures radiation information across multiple energy profiles simultaneously, enabling comprehensive material analysis without proportionally increasing system complexity.
2Loss of information
If dual detector regions with different thicknesses are used, then comprehensive energy distribution information is obtained, but the device complexity increases
Solution Approach 1:
Different detector regions are designed with different local qualities - specifically different thicknesses (first detector region with thickness of at least 2 mm, second detector region with thickness of at least 5 mm). This local differentiation allows each region to be optimized for detecting specific energy ranges, capturing comprehensive energy distribution information while maintaining a relatively simple overall detector structure.
3Measurement precision
If multiple energy profiles are used for radiation, then material composition information is enhanced, but the measurement time and scanning efficiency may increase
Solution Approach 1:
The dual detector regions operate simultaneously and continuously to detect radiation across multiple energy profiles. This continuous parallel detection eliminates the need for sequential scanning at different energy levels, thereby enhancing material composition information without significantly increasing scanning time or reducing productivity.
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 approach enhances the ability to differentiate between high and low atomic mass objects by leveraging the distinct interactions of high and low energy X-rays, providing comprehensive information across the energy spectrum and improving the detection of overlapping objects, thereby improving the accuracy and efficiency of cargo screening.
Implementation Method 1
The X-ray output from the X-ray linear accelerator is then collimated down to a narrow fan-beam of radiation which is shone through the item of cargo under inspection
Implementation Method 2
detecting the first profile radiation after it has interacted with or passed through the object
Implementation Method 3
A linear array of X-ray detector elements is then positioned opposite to the X-ray source such that it is irradiated by the fan-beam of radiation after attenuation of the X-ray beam by the object under inspection
Data Source
AI summary
The present application discloses methods and systems for scanning an object. The scanning system provides a first detector region having a thickness of at least 2 mm and a second detector region having a thickness of at least 5 mm. The second detector region is arranged to receive radiation that has passed through the first detector region. The method includes irradiating the object with radiation having having a peak energy of at least 1 MeV, and detecting the first profile radiation after it has interacted with or passed through the object in order to provide information relating to the object.