Digital X-Ray Detector EMI Artifact Removal
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Solution Overview
Problem
Digital x-ray imaging systems are susceptible to electromagnetic interference (EMI) that causes artifacts in images, degrading image quality and making it difficult to detect small or detailed features, especially in medical contexts, and existing shielding methods also reduce x-ray radiation quality.
Innovation Solution
A digital x-ray detector with a pixel array where scan lines are separated into first and second lines coupled to even and odd pixels respectively, allowing for the measurement and removal of EMI signals by activating and deactivating these lines during image acquisition to isolate and eliminate EMI artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding is used to attenuate electromagnetic radiation, then EMI artifacts are reduced, but x-ray radiation is also attenuated and image quality degrades
Solution Approach 1:
The scan lines are divided into two separate groups: first scan lines coupled to even pixels and second scan lines coupled to odd pixels. This segmentation allows independent control and measurement of EMI signals from different pixel groups, enabling selective EMI removal without affecting the entire image uniformly.
Solution Approach 2:
The EMI signal is extracted from the image data by measuring it separately using the divided scan line configuration. The EMI signal measured from pixels activated with one scan line group is used to remove EMI artifacts from pixels activated with the other scan line group, effectively separating the harmful EMI component from the useful image information.
2Manufacturing precision
If digital x-ray detectors are used to improve image quality and processing speed, then diagnostic capability is enhanced, but susceptibility to EMI increases causing artifacts
Solution Approach 1:
The pixel array is divided into even and odd pixel groups with separate scan line control. This allows the digital detector to maintain its high image quality and processing speed advantages while adding EMI resistance through the segmented readout approach.
Solution Approach 2:
The system uses feedback by measuring EMI signals from one pixel group and using that information to remove EMI artifacts from the other pixel group. This feedback mechanism allows the digital detector to actively compensate for EMI effects rather than merely being passive victims of interference.
3Object-affected harmful factors
If scan lines are separated into first and second lines for even and odd pixels, then EMI signals can be measured and removed, but device complexity increases
Solution Approach 1:
The scan line configuration is segmented into two independent sets (first scan lines for even pixels, second scan lines for odd pixels). While this increases structural complexity, it enables the measurement and removal of EMI signals that would otherwise be impossible to separate from the image data.
Solution Approach 2:
The separated scan line configuration serves multiple functions: it enables EMI measurement, facilitates EMI removal, and maintains full image acquisition capability. The same hardware structure supports both normal imaging and EMI correction operations without requiring additional dedicated components.
Data Source
AI summary
A system and method for eliminating image artifacts caused by electromagnetic interference (EMI) on a digital x-ray detector. The system and method includes a digital x-ray detector panel having an array of pixels in rows and columns, with a plurality of data lines coupled to the columns of pixels and a plurality of scan lines coupled to the rows of pixels. The system and method uses certain photodiodes in a row of the pixel array for measuring EMI with corresponding scan line and FETs deactivated and eliminating the EMI and image artifacts with the remaining photodiodes in the row with corresponding scan line and FETs activated.