Stationary X-ray Tomography Inspection System
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Solution Overview
Problem
Conventional X-ray inspection systems, particularly rotating gantry systems, are expensive, have a large footprint, consume high power, and are complex, making them inefficient for detecting threat materials and requiring significant maintenance.
Innovation Solution
A stationary X-ray inspection system with a multi-focus X-ray source having a non-circular geometry of X-ray source points and a detector array arranged in a similar geometry, allowing for efficient scanning with reduced power consumption and a smaller footprint, using regular line voltage and enabling faster data acquisition through electronic control of X-ray source points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotating gantry system with multiple X-ray sources is used, then image quality and material discrimination are improved, but device complexity, footprint, and power consumption increase significantly
Solution Approach 1:
The system divides the scanning task into two separate stages: a rapid low-resolution screening scan followed by a targeted high-resolution inspection scan only of suspicious regions. This segmentation allows the system to achieve high image quality where needed while maintaining simplicity and speed for routine screening, avoiding the need for continuously complex rotating gantry systems.
Solution Approach 2:
The system dynamically adjusts its operational mode based on screening results. The dual-stage approach allows transition from a simple rapid-scanning mode to a more complex focused inspection mode only when threats are detected, optimizing the balance between system complexity and image quality requirements.
2Reliability
If a rotating gantry system is used, then comprehensive volumetric scanning is achieved, but the system requires high power consumption and frequent maintenance
Solution Approach 1:
The system uses periodic action by performing rapid low-power screening scans continuously, followed by intermittent high-power focused scans only when anomalies are detected. This periodic approach maintains scanning completeness while dramatically reducing average power consumption compared to continuous high-power rotating gantry operation.
Solution Approach 2:
The system extracts and isolates only the regions of interest for detailed inspection, performing comprehensive scanning only where needed rather than continuously scanning the entire volume at high resolution. This extraction approach maintains reliability for threat detection while reducing overall power consumption.
3Measurement precision
If multiple X-ray sources are activated simultaneously to produce fan beams, then three-dimensional image reconstruction is improved, but manufacturing cost and operational complexity increase
Solution Approach 1:
The system segments the imaging process into two distinct phases: a first scan using a single X-ray source for rapid volumetric screening, and a second scan using multiple sources or higher power only for focused inspection of suspicious areas. This segmentation reduces manufacturing costs by avoiding the need for continuously operating complex multi-source systems while maintaining reconstruction quality when needed.
Solution Approach 2:
The system changes operational parameters dynamically, using standard power levels for routine screening and increasing power or activating additional sources only when higher resolution reconstruction is required. This parameter adjustment approach maintains manufacturing simplicity while enabling high-quality reconstruction on demand.
4Productivity
If the conveyor speed is increased to improve throughput, then productivity increases, but the scanning time per object decreases, potentially reducing detection accuracy
Solution Approach 1:
The system uses periodic action with two distinct scanning modes: a rapid first scan at high conveyor speed for throughput, followed by a second detailed scan at lower speed only for objects showing anomalies. This periodic approach maintains high productivity while ensuring detection accuracy is preserved for suspicious items through the slower second scan.
Solution Approach 2:
The system dynamically adjusts conveyor speed based on screening results. High speed is maintained during routine screening to maximize throughput, then reduced only when detailed inspection is required, optimizing the balance between productivity and detection accuracy adaptively.
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 achieves efficient threat detection with reduced operational costs and complexity, enabling faster image reconstruction and lower power usage while maintaining accurate material discrimination and image quality.
Implementation Method 1
a multi-focus X-ray source having a plurality of X-ray source points arranged in a non-circular geometry around a volume of inspection, wherein the sources emit X-ray beams having different beam angles
Implementation Method 2
A detector array is positioned between the X-ray source and the volume of inspection, and a processor analyzes sinogram data and reconstructed image data of the object being inspected
Data Source
AI summary
An X-ray inspection system for scanning items is provided. The system includes: a stationary X-ray source extending around a rectangular scanning volume, and defining multiple source points from which X-rays can be directed through the scanning volume; an X-ray detector array also extending around the rectangular scanning volume and arranged to detect X-rays from the source points which have passed through the scanning volume; a conveyor arranged to convey the items through the scanning volume; and at least one processor for processing the detected X-rays to produce scanning images of the items.