X-ray Detector Readout Timing for Artifact-Free Imaging
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Solution Overview
Problem
Existing X-ray detectors face challenges in maintaining a constant integration period during irregularly timed acquisitions, leading to artifacts and precision issues, while also incurring geometric distortions or high costs when using detectors that are not integration-time-dependent.
Innovation Solution
Implementing a readout condition that anticipates the satisfaction of the trigger condition within a default period, allowing the X-ray detector to be reset and an integration period of fixed length to be started, ensuring the X-ray pulse is emitted with precise timing and avoiding artifacts by synchronizing the detector, tube assembly, and trigger signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the length of the integration period is varied as a function of the trigger signal, then precision in satisfying trigger conditions is improved, but image artifacts are generated
Solution Approach 1:
The system performs preliminary actions by resetting the integration period in advance when the readout condition is satisfied (anticipating trigger condition within default period). This preliminary reset ensures that when the trigger condition occurs, the integration period is already properly positioned and configured, eliminating the need to vary integration period length and thus preventing image artifacts while maintaining precision
Solution Approach 2:
The system dynamically adjusts the timing of integration period resets based on the trigger signal characteristics. By monitoring whether the trigger condition will be satisfied within a default period and dynamically deciding when to reset, the system maintains constant integration period length while adapting to varying trigger timings, thereby avoiding artifacts and preserving precision
2Object-affected harmful factors
If the trigger time is varied to fit the detector cycle, then image artifacts are prevented, but precision in satisfying trigger conditions is impaired
Solution Approach 1:
The system performs preliminary assessment by checking the readout condition (whether trigger condition will be satisfied within default period) before actually resetting. This preliminary action allows the system to proactively position the integration period correctly, preventing artifacts while maintaining the ability to satisfy trigger conditions with high precision
Solution Approach 2:
The system uses feedback from monitoring the trigger signal and evaluating the readout condition to dynamically control when to reset the integration period. This feedback mechanism ensures that the integration period is always properly synchronized with upcoming trigger events, preventing artifacts while maintaining precision
3Stability of the object's composition
If X-ray detectors are operated at predefined detector cycle with periodic readout, then constant integration period length is provided, but difficulties occur when trigger time is unfavorable
Solution Approach 1:
The system combines the stability of periodic detector cycles with dynamic adaptability to irregular trigger timing. By dynamically deciding when to reset based on readout condition evaluation (predicting whether trigger will occur within default period), the system maintains constant integration period length while adapting to varying trigger patterns, thus achieving both stability and versatility
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 enables precise X-ray pulse timing and fixed integration duration, avoiding artifacts and allowing for cost-optimized selection of flat panel detectors, while maintaining optimized image quality for trigger-signal-dependent acquisitions.
Implementation Method 1
X-ray detectors suitable for taking digital X-rays are used. With X-ray detectors suitable for taking digital X-rays, the X-ray radiation directly or indirectly generates electrical charges that are collected during an integration period in an integration element
Data Source
AI summary
An X-ray device has an X-ray detector allocated to an X-ray tube assembly and configured as a flat panel detector, in which charges, accumulated over an integration period, of individual detector pixels are read out in a readout period following on from the integration period. In order to acquire the X-ray images, a trigger signal is captured, and if a trigger condition evaluating the trigger signal is satisfied, the acquisition of one of the X-ray images takes place using an integration period with a predetermined default length that is the same for all X-ray images. During the acquisition of the time series, in addition to the trigger condition, a readout condition that describes the anticipated imminence of the satisfaction of the trigger condition within a default period that is greater than or equal to the predetermined default length and evaluates the trigger signal is also monitored.