Fixed Spectrum Filter for Dual Energy X-ray Imaging
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Solution Overview
Problem
Conventional x-ray imaging using a single kVp is insufficient for precise characterization of objects due to energy-dependent attenuation, which can be improved by using dual energy spectra to separate photoelectric and Compton scattering interactions, but implementing separate filters for low and high energy spectra is challenging in rapid kVp-switching systems.
Innovation Solution
A spectrum separation fixed filter is applied to both x-ray spectra to increase energy separation, using a K-edge filter material like Gadolinium oxysulfide, which is cost-effective and easy to implement, to enhance material decomposition precision in dual energy x-ray imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate filters are used for low and high energy spectra, then spectral separation is improved, but device complexity increases
Solution Approach 1:
The patent combines separate low and high energy filters into a single fixed filter that works for both spectra. This filter is positioned in the beam path and remains stationary during rapid kVp switching, simplifying the system while maintaining spectral separation capability through the filter's energy-dependent attenuation properties
Solution Approach 2:
The fixed filter serves multiple functions: it acts as a beam hardening filter for the low energy spectrum and as a spectral separation element for the high energy spectrum. This multi-functional design eliminates the need for separate filters for each energy level, reducing device complexity while maintaining measurement precision
2Measurement precision
If dual energy spectra are used, then material decomposition precision is improved, but radiation dose increases
Solution Approach 1:
The patent utilizes the energy-dependent attenuation parameters of the fixed filter to differentially affect low and high energy photons. By changing the filter's effective attenuation characteristics based on photon energy, the system achieves spectral separation without requiring additional radiation dose, as the same filter is used for both energy levels
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 fixed filter improves material decomposition precision and reduces radiation dose while maintaining image quality, achieving up to 40% variance reduction in material decomposition noise, making it suitable for rapid kVp-switching dual energy x-ray systems.
Implementation Method 1
In the diagnostic energy range, x-ray attenuation is the combination of two photon-matter interactions: the photoelectric effect and Compton scattering. These two interactions are energy-dependent and reflect the effective atomic number and electron density of the object.
Implementation Method 2
In the diagnostic energy range, x-ray attenuation is the combination of two photon-matter interactions: the photoelectric effect and Compton scattering. These two interactions are energy-dependent and reflect the effective atomic number and electron density of the object.
Data Source
AI summary
An apparatus for x-ray imaging of an object is provided. An x-ray source for providing alternating x-ray spectrums is placed on a first side of the object. A spectrum separation fixed filter is placed between the x-ray source and the object. An x-ray detector is placed on a second side of the object opposite the x-ray source. A controller controls the x-ray source and the x-ray detector.