Dual-Energy Detector Array with Integrated Filtering
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Solution Overview
Problem
Conventional radiation imaging systems, including CT and dual-energy scanners, face challenges in distinguishing between objects with similar densities and chemical compositions, as they rely primarily on density and atomic number measurements, which can lead to misidentification of items such as threats or tumors.
Innovation Solution
A dual-energy detector array is introduced, comprising a circuit board assembly with two conversion packages and a radiation filtering material, allowing for the measurement of radiation attenuation at different effective photon energies, enabling the separation of Compton scattering and photoelectric interactions, and thus providing detailed density and atomic number information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dual-energy scanning is implemented to measure density and atomic number, then object classification accuracy improves, but device complexity increases
Solution Approach 1:
The detector array is segmented into multiple detector cells, each configured to detect radiation at different energy levels. This segmentation allows simultaneous measurement of attenuation at multiple energies without requiring complex mechanical switching mechanisms, thereby improving measurement precision while controlling device complexity
Solution Approach 2:
The patent transitions from single-energy to dual-energy detection by adding an energy dimension to the measurement process. This is achieved through detector cells with different energy response characteristics, enabling differentiation of materials based on both density and atomic number without fundamentally redesigning the entire scanning system
2Measurement precision
If radiation filtering material is added to achieve energy discrimination, then measurement precision improves, but device complexity increases
Solution Approach 1:
The radiation filtering material is merged directly into the detector cell structure, combining the filtering function with the detection function. This integration eliminates the need for separate filtering components and reduces overall device complexity while maintaining energy discrimination capability
Solution Approach 2:
Radiation filtering material acts as an intermediary between the incident radiation and the detector cells, selectively attenuating certain energy ranges before detection. This mediator approach enables energy spectrum separation without requiring complex post-processing or additional detection mechanisms
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 solution enhances the ability to differentiate between objects based on their chemical makeup and density, improving the accuracy of object identification and classification in various applications, including security and medical imaging.
Implementation Method 1
a radiation filtering material...configured to attenuate at least some of the radiation photons impinging thereon
Implementation Method 2
The detector array typically comprises a plurality of detector cells, respectively configured to convert detected radiation into electrical signals
Implementation Method 3
In the diagnostic range of radiation energies up to 200 keV, for example, radiation interacts with matter primarily through Compton scattering and photoelectric interactions
Implementation Method 4
In the diagnostic range of radiation energies up to 200 keV, for example, radiation interacts with matter primarily through Compton scattering and photoelectric interactions
Data Source
AI summary
A dual-energy detector array for a radiation system is provided. The dual-energy detector array includes a circuit board assembly having a first side and a second side. A first conversion package is coupled to the first side of the circuit board assembly and has a first effective photon energy. A second conversion package is coupled to the second side of the circuit board assembly and has a second effective photon energy different than the first effective photon energy. A radiation filtering material is disposed within the circuit board assembly between the first conversion package and the second conversion package. The radiation filtering material attenuates at least some of the radiation photons impinging thereon.