X-ray Imaging Filter Unit for Energy Calibration
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Solution Overview
Problem
Existing X-ray imaging technologies face challenges in accurately calibrating energy levels using the K-absorption edge method due to varying energy resolution in photon counting detectors, requiring simultaneous measurements with two detectors, which increases costs and data complexity, and suffer from efficiency losses in separating X-ray fluorescence from exciting X-rays, especially with varying metal thicknesses.
Innovation Solution
An X-ray imaging apparatus with a filter unit comprising a first filter to shape X-ray spectra and a second filter made of heavy metal to generate X-ray fluorescence, allowing for efficient energy calibration and monochromatic X-ray generation, even with reduced thickness of the second filter, thereby improving energy calibration accuracy and reducing installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the K-absorption edge method is used for energy calibration, then energy calibration can be performed, but the calibration accuracy deteriorates when photon counting detector energy resolution fluctuates
Solution Approach 1:
The patent introduces a fluorescence converter (second filter) as an intermediary substance that converts incident X-rays into fluorescence with a known, fixed energy spectrum. This intermediary provides a stable reference that is independent of detector fluctuations, allowing accurate energy calibration even when detector energy resolution varies. The fluorescence converter acts as a mediator between the X-ray source and detector, providing a consistent reference signal.
2Measurement precision
If two photon counting detectors are used for simultaneous measurement of X-ray fluorescence, then energy calibration can be performed, but installation costs and data complexity increase
Solution Approach 1:
The patent makes the single photon counting detector multi-functional by having it perform both the primary measurement function and the energy calibration function. The fluorescence converter enables the same detector to acquire calibration data and imaging data, eliminating the need for a second dedicated calibration detector. This universal approach reduces system complexity while maintaining calibration capability.
3Measurement precision
If the second filter thickness is increased to generate sufficient X-ray fluorescence, then calibration accuracy improves, but installation costs and material usage increase
Solution Approach 1:
The patent optimizes the thickness parameter of the second filter (fluorescence converter) to achieve the minimum required thickness for sufficient fluorescence generation. By carefully controlling the thickness parameter within a specific range, the system achieves accurate calibration with reduced material quantity, balancing performance and cost. This parameter optimization allows using thinner, less expensive filter materials while maintaining calibration accuracy.
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 accurate energy calibration and efficient generation of monochromatic X-rays, enhancing the Signal-to-Noise ratio in X-ray CT images while reducing the thickness and cost of the second filter, thus improving the efficiency and precision of X-ray imaging.
Implementation Method 1
a first filter configured to shape a spectrum of the X-rays
Implementation Method 2
a second filter configured to generate X-ray fluorescence on the basis of X-rays related to a spectrum resulting from the shaping by the first filter
Data Source
AI summary
An X-ray imaging apparatus according to an embodiment of the present disclosure includes an X-ray tube, a photon counting X-ray detector, and a filter unit. A generating unit of the X-ray tube is configured to generate X-rays. The photon counting X-ray detector is configured to count photons contained in the X-rays. The filter unit is provided between the X-ray tube and the photon counting X-ray detector. The filter unit includes a first filter and a second filter. The first filter is configured to shape a spectrum of the X-rays. The second filter is configured to generate X-ray fluorescence on the basis of X-rays related to a spectrum resulting from the shaping by the first filter.