X-ray Processing Electronics for Pile-up Correction
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Solution Overview
Problem
Current X-ray imaging devices face challenges in accurately counting high-intensity X-ray photons due to event pile-up and reduced detection efficiency, especially in energy-dispersive CT, where high flux densities lead to inaccurate results and distortion of the measured spectrum.
Innovation Solution
The solution involves processing electronics that combine count information from a pulse counter section with intensity information from an integrator section, using a transfer function to derive energy-dispersive information even in integrating mode, and dynamically adjusting weights to improve accuracy across varying photon flux densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detector operates in counting mode to detect individual photons, then energy-dispersive information can be obtained, but at high photon flux densities the detector becomes busy collecting charges and processing analog signals, leading to decreased event-detection efficiency and significant event pile-up
Solution Approach 1:
The detector is divided into two separate sub-detectors: a first sub-detector operating in counting mode for energy-dispersive information, and a second sub-detector operating in integrating mode for intensity measurement. This segmentation allows each sub-detector to optimize its operation for its specific function, avoiding the conflicts that arise when a single detector tries to perform both functions simultaneously at high flux densities.
Solution Approach 2:
A processor acts as an intermediary that combines the count information from the first sub-detector with the intensity information from the second sub-detector. The processor uses the intensity information to correct for event pile-up effects and to derive accurate energy-dispersive information even when the counting detector is operating under high flux conditions where pile-up would normally distort the spectrum.
2Productivity
If correction factors are applied to account for detector busy time, then event-detection efficiency can be partially compensated, but the ideal correction factor depends on the magnitude of incoming X-ray photon flux, making accurate results difficult to achieve
Solution Approach 1:
The system uses feedback by continuously monitoring the intensity of incoming photons through the second sub-detector and using this information to adjust the correction applied to the count data from the first sub-detector. The processor dynamically determines correction factors based on the measured intensity, ensuring accurate results across varying photon flux conditions without requiring pre-calibrated correction tables.
3Quantity of substance
If the detector processes analog signals from charge collection, then photon detection can be performed, but at high flux densities event pile-up occurs causing distortion of the measured X-ray spectrum
Solution Approach 1:
The processor serves as an intermediary that receives both the raw count data from the counting detector and the intensity data from the integrating detector. It uses the intensity information as a mediator to calculate and apply corrections for event pile-up, thereby recovering the true X-ray spectrum even when the counting detector experiences pile-up at high flux densities.
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
This approach allows for accurate energy-dispersive information derivation and improved counting efficiency, even at high photon fluxes, by effectively utilizing both count and intensity information, reducing the impact of event pile-up and enhancing the accuracy of photon counting in X-ray imaging devices.
Implementation Method 1
when a photon impinges on the conversion material of a sensor, it creates a charge pulse. This charge pulse (sometimes also referred to as current pulse) is detected and the presence of a photon is concluded.
Data Source
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AI summary
The present invention relates to processing electronics (18) for a detector (12) of an X-ray imaging device (14), the processing electronics (18) with a pulse counter section (22) having at least one count output (30) and with an integrator section (24) having an intensity output (32), wherein the processing electronics (18) is adapted to be connected to a sensor (16) in such a manner that X-ray photons (58) arriving at the sensor (16) can be processed by the pulse counter section (22), by the integrator section (24), or both, and wherein the processing electronics (18) comprises a processor (34) adapted to be connected to the count output (30) and to the intensity output (32) and adapted to output a count result (K) that takes into account both count information (N) obtained at the count output (30) and intensity information (I) obtained at the intensity output (32), so that the count result (K) contains information (N) obtained from the pulse counter section (22) and information (M) obtained from the integrator section (24). The present invention further relates to a corresponding detector element (10) for a detector (12), an X-ray imaging device (14), a method for determining a count result (K) from a detector element (10), a computer program, a data carrier and a detector (12) for an X-ray imaging device (14).