Photon-Counting X-Ray Calibration for Adaptive Energy Thresholds
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Solution Overview
Problem
Existing X-ray imaging systems, particularly those using multi-bin photon counting detectors, face challenges in optimizing energy bin thresholds for improved image quality and patient dose efficiency, leading to suboptimal contrast-to-noise ratio and increased radiation exposure.
Innovation Solution
A method and system for calibrating X-ray imaging systems with multi-bin photon counting detectors by performing attenuation measurements with varying energy bin thresholds, determining performance metrics, and selecting custom energy bin thresholds based on material composition to enhance image quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed energy bin thresholds are used in multi-bin photon counting detectors, then the device complexity is reduced and operation is simplified, but image quality deteriorates due to suboptimal contrast-to-noise ratio and patient dose efficiency increases due to increased radiation exposure
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting energy bin thresholds based on measured material composition. The system performs attenuation measurements, determines material basis coefficients through decomposition, and adapts the energy bin thresholds to optimize image quality for the specific patient anatomy and imaging task, rather than using fixed thresholds
Solution Approach 2:
The patent implements dynamics by making the energy bin thresholds adaptive rather than static. The thresholds are adjusted in real-time based on the measured material composition and imaging task requirements, allowing the system to optimize performance for each specific scanning scenario and patient
2Ease of operation
If fixed energy bin thresholds are used, then the ease of operation is improved, but the adaptability to different material compositions and imaging tasks deteriorates
Solution Approach 1:
The system applies self-service by automatically determining material composition through attenuation measurements and basis decomposition, then autonomously selecting optimal energy bin thresholds without requiring manual operator intervention. The system serves itself by adapting to different material compositions and imaging tasks
Solution Approach 2:
The patent changes the energy bin threshold parameters dynamically based on measured material composition and imaging task requirements, enabling the system to adapt to different scanning scenarios automatically
3Loss of energy
If standard energy bin thresholds are used, then the device complexity is minimized, but the patient dose efficiency deteriorates due to increased radiation exposure
Solution Approach 1:
The patent applies preliminary action by performing attenuation measurements and determining material composition before final image reconstruction. The system pre-determines the optimal energy bin thresholds based on the measured material basis coefficients, allowing for optimized radiation dose efficiency in subsequent imaging
Solution Approach 2:
The system changes energy bin threshold parameters based on preliminary measurements of material composition, enabling optimized radiation dose efficiency without requiring complex real-time adjustments during scanning
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 proposed calibration method improves image quality by optimizing energy bin thresholds, enhancing contrast-to-noise ratio and reducing radiation dose, resulting in a more adaptable and efficient X-ray imaging system.
Implementation Method 1
each registered photon generates a current pulse which is compared to a set of thresholds, thereby counting the number of photons incident in each of a number of energy bins
Implementation Method 2
The emitted X-rays are attenuated by the subject or object as they pass through, and the resulting transmitted X-rays are measured by the X-ray detector
Data Source
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AI summary
A system and method for supporting calibration of an X-ray imaging system, wherein the X-ray imaging system comprises a multi-bin photon counting X-ray detector having multiple energy bin thresholds. The method includes performing a set of X-ray attenuation measurements or measurement scans of at least one object, using different settings of the energy bin thresholds and obtaining information about material composition related to the object(s). The method further includes determining, for each X-ray attenuation measurement or measurement scan, a value of at least one performance metric related to the X-ray imaging system and selecting a custom set of energy bin thresholds based on the determined values of the performance metrics over the set of X-ray attenuation measurements or measurement scans. Also, the method includes determining calibration data coupling the selected custom set of energy bin thresholds to at least the information about material composition.