X-Ray Detector EMI Detection Using Offset Signal Variation
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Solution Overview
Problem
Existing X-ray detectors are prone to electromagnetic interference fields, leading to image artifacts in image data, which current methods fail to detect and correct effectively.
Innovation Solution
A method and device for detecting electromagnetic interference fields by determining a variation in detector signal values, comparing them to a threshold value, and informing the user to avoid incorrect measurements and image artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic screening measures are taken (maintaining distances from electrical equipment), then image quality is improved, but device complexity and operational convenience deteriorate
Solution Approach 1:
The system performs preliminary detection of electromagnetic interference fields before X-ray imaging by measuring offset signals from pixels not exposed to X-rays. The variation in these offset signals is compared against threshold values to predict potential interference effects, allowing preventive actions to be taken before actual imaging occurs
Solution Approach 2:
The system continuously monitors detector signals during operation, calculates variations in offset signals, and provides feedback when interference is detected. This feedback mechanism allows real-time adjustment of imaging parameters or repetition of imaging only when necessary, optimizing both image quality and operational efficiency
2Measurement precision
If offset signal subtraction is performed for each pixel, then static interference is compensated, but dynamic interference effects cannot be factored out
Solution Approach 1:
The system transitions from static offset subtraction to dynamic interference detection by continuously monitoring the variation in offset signals over time. The method calculates the variation of offset signals during X-ray exposure and compares it against threshold values to detect dynamic electromagnetic interference effects that change during operation
Solution Approach 2:
The system performs preliminary detection of electromagnetic interference by measuring offset signal variations before and during X-ray exposure. Threshold values are determined through detector type-specific tests to predict when interference effects will occur, enabling proactive compensation rather than reactive correction
3Reliability
If X-ray imaging is repeated to ensure image quality, then image reliability is improved, but radiation exposure increases
Solution Approach 1:
The system performs preliminary detection of electromagnetic interference conditions before X-ray imaging by analyzing offset signal variations. By predicting potential interference effects in advance, the system可以避免 unnecessary repeated imaging, thereby reducing radiation exposure while maintaining image reliability
Solution Approach 2:
The system provides feedback on detected interference conditions to determine whether image repetition is necessary. This feedback mechanism ensures that repeated imaging occurs only when actual interference is detected, optimizing the balance between image reliability and radiation dose
Data Source
AI summary
A method is described for detection of electromagnetic interference fields during the operation of an X-ray detector. In the method, a value is determined that represents a variation of successive detector signal values of a pixel of the X-ray detector not exposed to X-rays. The value is compared with a predetermined threshold value and it is determined that an interference by electromagnetic interference fields has occurred in the event that the determined value exceeds the predetermined threshold value. An interference detection facility and an X-ray detector are also described.