X-ray Scanner Anode Segmentation for Energy Discrimination
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Solution Overview
Problem
Current X-ray scanners face challenges in materials discrimination due to the high complexity and power dissipation of detecting every X-ray photon's energy, especially in high-speed tomographic imaging systems where object motion creates artifacts, and integrating detectors are expensive and inefficient.
Innovation Solution
An X-ray scanner with an anode having a target surface composed of multiple material areas, where an electron source directs electrons to generate X-rays with different energy spectra, and two sets of detectors with different response characteristics, including a filter material, to enhance energy discrimination and reduce signal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive integrating detectors are used to measure every X-ray photon energy, then materials discrimination capability is improved, but system cost and complexity increase significantly
Solution Approach 1:
The detection system is segmented into multiple inexpensive integrating detectors, each responsible for measuring a specific energy range or spectral component. This divides the complex task of full spectral measurement into simpler, parallel measurement channels, reducing the complexity and cost of each individual detector while maintaining overall materials discrimination capability through combined spectral analysis
Solution Approach 2:
Filter materials are introduced as intermediaries between the X-ray source and detectors. These filters selectively attenuate specific energy ranges, enabling inexpensive integrating detectors to indirectly measure spectral information that would otherwise require complex energy-resolving detectors. The filters act as mediators that transform the measurement problem into a simpler form suitable for cost-effective detector implementation
2Measurement precision
If multiple detectors with different energy responses are used, then energy spectrum measurement is improved, but signal leakage between detectors increases
Solution Approach 1:
Filter materials serve as intermediaries that selectively attenuate specific energy ranges before they reach different detectors. This prevents high-energy photons from overwhelming low-energy detectors and reduces cross-contamination between energy channels, thereby minimizing signal leakage while maintaining accurate spectral measurement capability across multiple detectors
Solution Approach 2:
Different filter materials with specific attenuation characteristics are placed in front of different detectors to create localized optimization for each detector's energy response. Each detector- filter combination is tailored to measure a specific portion of the X-ray spectrum, improving overall spectral measurement accuracy while reducing interference and signal leakage between channels
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 solution enables improved materials discrimination and reduced signal leakage between detectors, allowing for more accurate and efficient imaging by generating X-rays with distinct energy spectra and using filters to optimize detector responses, enhancing the accuracy of tomographic imaging.
Implementation Method 1
The electron source may be arranged to direct electrons at a series of target areas of the target surface, in a predetermined order, so as to generate X-ray beams having different energy spectra
Implementation Method 2
The filtered detector is generally made thick to measure the high energy components of the X-ray beam transmitted through the object. The unfiltered detector is usually quite thin and so responds preferentially to the low energy components of the transmitted X-ray beam
Data Source
AI summary
The present invention is directed toward an X-ray scanner that has an electron source and an anode. The anode has a target surface with a series of material areas spaced along it in a scanning direction. The material areas are formed from different materials. The electron source is arranged to direct electrons at a series of target areas of the target surface, in a predetermined order, so as to generate X-ray beams having different energy spectra.