Dual-Energy X-Ray Detection Using Segmented Pixel Arrays
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Solution Overview
Problem
Current megavolt-level X-ray detection systems face limitations in effective atomic number identification and space identification due to time and position deviations in dual-energy X-ray beam methods, requiring high stability in X-ray source output and increased technical complexity, as well as reduced detection efficiency and increased crosstalk with small-pixel detectors.
Innovation Solution
A dual-energy detection apparatus and method utilizing a first pixel detector array proximal to the X-ray source for low-energy detection and a second pixel detector array distal for high-energy detection, with scintillator-based detectors and reflection layers, allowing for enhanced substance and space identification by combining signals from both arrays to acquire effective atomic number information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dual-energy X-ray beam methods are used to improve substance identification capability, then effective atomic number identification is enhanced, but time and position deviations occur and technical complexity increases
Solution Approach 1:
The detection system is segmented into two separate detector arrays: a first pixel detector array for low-energy X-ray detection and a second pixel detector array for high-energy X-ray detection. This segmentation allows each detector to be optimized for its specific energy range, eliminating the need for complex dual-energy beam switching mechanisms while achieving dual-energy substance identification capability.
Solution Approach 2:
The patent introduces an intermediary approach by using two separate detector arrays that simultaneously detect low-energy and high-energy X-rays independently. This intermediary detection method avoids the direct complexity of dual-energy beam generation and switching, while still enabling effective atomic number identification through comparative analysis of the two energy signals.
2Measurement precision
If small-pixel detectors are used to improve space identification capability, then spatial resolution is enhanced, but detection efficiency decreases and crosstalk increases
Solution Approach 1:
The detection system segments the pixel detector array into two independent arrays with different pixel configurations. The first array uses smaller pixels optimized for spatial resolution in low-energy detection, while the second array uses larger pixels optimized for detection efficiency in high-energy detection. This segmentation allows each array to operate at its optimal performance point without the trade-offs present in a single unified array.
Solution Approach 2:
Different regions of the detection system are assigned different local qualities: the first pixel detector array has small pixel dimensions for high spatial resolution in low-energy regions, while the second pixel detector array has larger pixel dimensions for high detection efficiency in high-energy regions. This local quality optimization eliminates the need to compromise overall detection efficiency for the sake of spatial resolution.
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
Improves substance identification capability and space identification indicators by simultaneously detecting low and high-energy X-ray photons without time or position deviation, enhancing detection efficiency and sensitivity while reducing technical complexity.
Implementation Method 1
the first sensitive medium is a first scintillator; each of the first pixel detectors includes the first scintillator having a rectangular shape
Implementation Method 2
the second sensitive medium is a second scintillator; and each of the second pixel detectors includes the second scintillator having a rectangular shape
Implementation Method 3
a first reflection layer coating the first scintillator, the first reflection layer exposing the first window; and one side of each of the first pixel detectors opposite to the first window is the first incidence plane
Data Source
AI summary
The present application relates to a dual-energy detection method, system and apparatus. The apparatus includes: a first pixel detector array proximal to a ray source, configured to detect ray source photons having relatively low energy; and a second pixel detector array distal from the ray source, configured to detect ray source photons having relatively high energy; wherein the first pixel detector array includes a plurality of rows of first pixel detectors, the first pixel detector including a first sensitive medium, a first photosensitive device, a first incidence plane, and a first window; the second pixel detector array includes a single row of second pixel detectors, the second pixel detector including a second sensitive medium, a second photosensitive device, a second incidence plane, and a second window; and each of the second pixel detectors has the same pixel area as corresponding plurality of first pixel detectors thereof.