X-ray Detector Radiation Drift Correction
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Solution Overview
Problem
Existing X-ray detectors in CT and C-arm systems face challenges due to radiation drift, which affects measurement sensitivity and leads to artifacts in images, requiring high-quality detector materials with low and homogeneous radiation drift, resulting in complex selection methods and high costs.
Innovation Solution
A method that accounts for the history of radiation exposure of X-ray detectors by applying a correction factor dependent on the radiation history, including duration, intensity, and spectral composition of irradiation, to correct the measuring signal and reduce radiation drift artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-quality detector materials with low and homogeneous radiation drift are selected, then measurement precision and image quality are improved, but device complexity and cost increase due to complicated selection methods
Solution Approach 1:
The patent changes the approach from selecting materials based on inherent radiation drift properties to dynamically adjusting measurement parameters (correction factors) based on recorded radiation exposure history. This transforms a material selection problem into a parameter adjustment problem, reducing complexity while maintaining measurement precision.
Solution Approach 2:
The patent replaces the physical/material-based solution (selecting specific detector materials with low radiation drift) with a computational/software-based solution (applying correction factors based on radiation history). This substitution eliminates the need for complicated material selection and quality control processes.
2Measurement precision
If high-quality detector materials are used to reduce radiation drift, then image quality is improved, but cost increases
Solution Approach 1:
The patent allows the use of standard detector materials by changing the measurement approach to include dynamic correction factors. This eliminates the need to purchase expensive specialized materials while maintaining image quality through computational compensation for radiation drift.
Solution Approach 2:
The patent replaces expensive, long-lived high-quality detector materials with a combination of standard materials and computational correction methods. The correction factors act as a temporary, adjustable solution that compensates for material limitations without requiring investment in expensive permanent material upgrades.
3Object-affected harmful factors
If detector materials with low radiation drift are selected, then artifacts in images are reduced, but device complexity increases
Solution Approach 1:
The patent replaces the physical solution of selecting specialized low-drift materials with a computational approach using correction factors. This substitution eliminates the need for complex material selection processes while effectively reducing radiation drift artifacts through software-based compensation.
Solution Approach 2:
The patent implements a feedback mechanism where radiation exposure history is recorded and used to calculate correction factors that compensate for radiation drift. This closed-loop approach continuously adapts to reduce artifacts without requiring complex upfront material selection or quality control processes.
4Device complexity
If standard detector materials are used without correction, then device complexity is reduced, but measurement precision deteriorates due to radiation drift
Solution Approach 1:
The patent introduces a feedback mechanism that records radiation exposure history and uses it to calculate correction factors. This feedback loop compensates for radiation drift in real-time, maintaining measurement precision while allowing the use of standard, simple detector materials without complex selection processes.
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 simplifies the selection of detector materials, reduces radiation drift-related artifacts, and improves the accuracy of X-ray images by pixel-specific assessment of radiation deposition history, allowing for more cost-effective detector material usage.
Implementation Method 1
Solid state detectors are frequently used in computed tomography (CT) and other imaging methods with ionizing radiation
Implementation Method 2
the detector material is changed by the incident x-ray radiation and the signal response of these detector materials is thus varied as a function of the history of the absorbed X-ray radiation
Data Source
AI summary
In a method, with a current measurement, the history of the radiation exposure of the X-ray detector is taken into account with respect to the overall X-ray detector or subareas of the X-ray detector, in respect of a reduction in the measurement sensitivity produced as a result and a recovery of the reduction in the measurement sensitivity, and the determined measuring signal is corrected with a correction factor which is dependent on the history of the radiation exposure. Furthermore, an X-ray recording system includes a detector which includes a plurality of detector elements, which are read out in groups channel by channel and a read-out apparatus with computer-assisted device for correcting read-out detector data prior to a further processing of the detector data to form projective or tomographic images.