Partial Energy Discriminating Detector Array for X-ray Scanner
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Solution Overview
Problem
Conventional X-ray scanners face challenges in achieving high energy resolution and cost-effectiveness due to the high component cost of energy discriminating detectors, making it economically prohibitive to implement multiple or even single projection X-ray detectors with full energy discriminating capabilities, especially when trying to minimize the number of views required for effective threat detection.
Innovation Solution
The system employs a dual-view configuration with a single-view setup using dual-energy sensitive stacked detectors partially populated with multi-energy discriminating detectors made from high-Z semiconductor materials, such as cadmium-telluride (CdTe), cadmium-zinc-telluride (CZT), mercury iodide (HgI2), selenium (Se), and lead iodide (PbI2), positioned to align with the object within a receptacle, allowing for improved energy resolution and reduced component costs by optimizing detector placement and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If energy discriminating detectors are used to improve energy resolution and material discrimination, then measurement precision is improved, but device complexity and component cost increase
Solution Approach 1:
The detector array is segmented into two distinct types: conventional detectors for general imaging and energy discriminating detectors for enhanced material discrimination. This segmentation allows the system to achieve improved energy resolution only in regions where it is most needed (where objects are located), rather than deploying expensive energy discriminating detectors across the entire array, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
Energy discriminating detectors are strategically positioned only in specific regions of the detector array where objects are expected to be detected, rather than uniformly distributing them across the entire array. This local quality approach ensures high energy resolution is applied where it provides maximum value while reducing overall system complexity and cost in regions where conventional detectors suffice
2Measurement precision
If multiple projection views are added to improve automated threat detection performance, then measurement precision is improved, but device complexity and component cost increase
Solution Approach 1:
Instead of implementing multiple full projection views which would double or triple the cost, the system applies energy discriminating detectors to only a portion of the single-view detector array. This partial action provides sufficient material discrimination capability for effective threat detection without the excessive cost and complexity of multiple complete views
Solution Approach 2:
The system changes the energy discrimination parameter by using energy discriminating detectors in specific regions rather than relying on multiple views. This parameter change allows the system to achieve improved material discrimination and threat detection accuracy through energy resolution enhancement in targeted areas, avoiding the need to increase the number of projection views
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 configuration enables enhanced energy resolution and improved material discrimination, allowing for effective threat detection with reduced component costs, achieving performance comparable to dual-view systems while minimizing incremental cost increases, thus addressing the trade-off between cost and performance.
Implementation Method 1
a third and a fourth set of energy discriminating detectors for receiving the X-rays transmitted through the object
Implementation Method 2
dual-energy sensitive stacked detectors partially populated with multi-energy discriminating detectors made from high-Z semiconductor materials
Data Source
AI summary
The present specification describes a scanning/inspection system configured as a dual-view system using dual-energy sensitive stacked detectors that are partially populated with multi-energy discriminating detectors for overall enhanced energy resolution and therefore improved discrimination of materials through better estimation of material physical properties such as density and effective atomic number.