Multi-Energy X-Ray Imaging Filtering Device for Energy Separation
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Solution Overview
Problem
Current multi-energy X-ray imaging systems with fast-switching X-ray sources face limitations in achieving sufficient mean energy separation between low-energy and high-energy spectra due to rapid kVp switching, which restricts the use of dynamic X-ray beam filtration schemes, leading to significant spectral overlap and reduced clinical usefulness of reconstructed images.
Innovation Solution
A multi-energy X-ray imaging system that employs a filtering device with septa disposed at fixed positions, allowing for focal alignment and misalignment of the X-ray beam to optimize energy spectra separation, enabling increased mean energy separation between low- and high-energy spectra by minimizing attenuation during low-energy acquisitions and shaping the high-energy spectrum during high-energy acquisitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If rapid kVp switching is used to enable fast switching between low-energy and high-energy spectra, then acquisition speed is improved, but dynamic beam filtration capability deteriorates
Solution Approach 1:
The filtering device is pre-positioned at focal alignment before data acquisition begins. During low-energy acquisition, the septa are already in the focal alignment position, ready to minimize attenuation without requiring dynamic movement. This preliminary positioning enables rapid switching while maintaining filtration capability.
2Measurement precision
If dynamic filtration is implemented to improve mean energy separation, then energy separation is improved, but device complexity increases
Solution Approach 1:
The filtering device incorporates a stage that permits translation in one or more directions perpendicular to the X-ray beam direction, enabling dynamic repositioning between focal alignment and focal misalignment. This dynamic capability allows the system to optimize energy separation by selectively filtering the high-energy spectrum while maintaining relatively simple device architecture.
3Measurement precision
If septa are focally misaligned to filter high-energy spectrum, then mean energy separation is improved, but attenuation during low-energy acquisition increases
Solution Approach 1:
The filtering device dynamically repositions the septa based on the energy spectrum being acquired. During low-energy acquisition, the septa are positioned at focal alignment to minimize attenuation. During high-energy acquisition, the septa are repositioned to focal misalignment to achieve spectral filtering and improve mean energy separation. This dynamic adaptation resolves the contradiction between minimizing attenuation and improving energy separation.
4Productivity
If fast-switching source is used to maintain acquisition speed, then productivity is improved, but spectral overlap increases
Solution Approach 1:
The filtering device acts as an intermediary between the fast-switching X-ray source and the detector. By introducing this intermediate filtering element, the system can shape the high-energy spectrum to reduce spectral overlap with the low-energy spectrum, thereby improving energy separation while maintaining the fast-switching capability of the source.
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 enhances the accuracy of material decomposition processing by increasing mean energy separation, reducing noise amplification and improving the clinical usefulness of reconstructed images, while maintaining the ability to quickly switch between energy spectra.
Implementation Method 1
an X-ray source configured to emit X-rays from a focal spot toward an object to be imaged
Implementation Method 2
the underlying physical effects of X-ray interaction with matter, namely, the Compton scattering effects and photoelectric effects
Implementation Method 3
the underlying physical effects of X-ray interaction with matter, namely, the Compton scattering effects and photoelectric effects
Implementation Method 4
A filtering device includes an X-ray translucent support structure having a plurality of septa disposed therein
Data Source
AI summary
A filtering device includes an X-ray translucent substrate having a plurality of septa disposed therein at a plurality of fixed positions with respect to the substrate. A controller is programmed to acquire a first set of projection data at a first energy spectrum by controlling the X-ray source to emit the X-rays at the first energy spectrum and controlling the position of the filtering device to focally align the plurality of septa with the X-ray beam emitted from the focal spot, and to acquire a second set of projection data at a second energy spectrum with a mean energy greater than the mean energy of the first energy spectrum by controlling the X-ray source to emit the X-rays at the second energy spectrum and controlling a change in the position of the filtering device to focally misalign the plurality of septa with the X-ray beam emitted from the focal spot.