Adaptive EMI Cancellation in Digital X-Ray Detectors
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Solution Overview
Problem
Digital X-ray detectors are susceptible to electromagnetic interference (EMI) from external sources, which degrades image quality by causing artifacts such as streaks, blurring, and distortion, and existing shielding methods like using metals can absorb x-rays, degrading clinical information.
Innovation Solution
A system that determines the frequency of external noise signals and adjusts the line time of the digital X-ray detector using a processor and software to minimize the influence of EMI, by either direct measurement with an EMI detector or indirect measurement through sampling images at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal shielding materials are placed in front of the X-ray detector to block EMI, then electromagnetic interference is reduced, but the incoming X-ray is absorbed and clinical information is degraded
Solution Approach 1:
The patent replaces the mechanical/physical shielding approach (metal barriers) with an electronic signal processing approach. The system captures the EMI signal through the detector, identifies its frequency characteristics, and generates anti-phase cancellation signals that are added to the detected image data, thereby eliminating the need for physical shielding materials that would block X-rays.
Solution Approach 2:
The patent converts the harmful EMI signal into a useful cancellation signal. By detecting the EMI that passes through the detector, analyzing its frequency spectrum, and generating anti-phase signals, the system transforms the harmful interference into a benefit by using it as the basis for creating cancellation signals that eliminate the artifact.
2Object-affected harmful factors
If thin metal shielding is used to reduce EMI, then some electromagnetic interference is blocked, but the shielding effectiveness is degraded
Solution Approach 1:
The patent replaces inadequate mechanical shielding with a reliable electronic cancellation system that works by detecting EMI frequencies and generating anti-phase signals, providing consistent and reliable EMI removal without the limitations of thin metal shielding.
3Stability of the object's composition
If the line time of the X-ray detector is fixed, then the detector operates stably, but it cannot adapt to different noise frequencies
Solution Approach 1:
The patent introduces dynamic adaptability to the detector system by allowing the line time to be adjusted based on detected noise frequencies. The system analyzes the frequency spectrum of captured signals, identifies EMI frequencies, and modifies the line time accordingly to optimize cancellation effectiveness, transforming a static system into a dynamically adaptive one.
Solution Approach 2:
The patent changes the operational parameter (line time) of the detector based on the detected noise characteristics. By analyzing the frequency spectrum and identifying EMI frequencies, the system adjusts the line time parameter to align with the noise period, enabling effective cancellation while maintaining stable operation.
4Object-affected harmful factors
If the line time is adjusted to cancel EMI, then noise cancellation is improved, but the system complexity increases
Solution Approach 1:
The patent implements a feedback control system where the detector continuously monitors incoming signals for EMI frequency characteristics, and the line time is adjusted based on this feedback. The system captures signals, analyzes their frequency content, identifies noise patterns, and modifies operational parameters accordingly, creating a closed-loop control mechanism that automatically adapts to changing EMI conditions.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment by automatically detecting EMI frequencies from the captured signals and modifying its own line time parameter without external intervention. The detector serves itself by identifying its own interference problems and implementing the necessary corrections autonomously.
Data Source
AI summary
Systems, methods and apparatus are provided through which in some embodiments the line time of an X-Ray detector is dynamically selected so as to nullify an aliased interference signal. The frequency of a noise signal generated by a source external to the digital X-ray detector is determined and, based on the determined frequency, the line time of the digital X-ray is adjusted so as to compensate for the interfering noise. The frequency of the noise can be directly determined from an electromagnetic interference (EMI) sensor or derived through analysis of the power spectrum of the noise signal.