Flat Panel Detector Pixel Layout for Dynamic X-Ray Image Alignment
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Solution Overview
Problem
Existing flat panel detectors face challenges in accurately positioning real-time charge images generated during dynamic X-ray exposure, leading to unsatisfactory image synthesis due to varying positions and grayscales, which affects the quality and accuracy of the final image.
Innovation Solution
The flat panel detector incorporates a combination of photosensitive and alignment pixel units with distinct fixed grayscales, where photosensitive units adjust grayscale based on incident light and alignment units maintain a fixed grayscale, allowing for precise alignment and positioning of charge images within a preset region using alignment marks and a coordinate acquisition unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment pixel units with different fixed grayscales are introduced, then image positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The pixel array is segmented into two functional types: photosensitive pixel units for image capture and alignment pixel units for positioning. The alignment pixel units are further segmented into first alignment pixel units (normally black) and second alignment pixel units (normally white), each with distinct fixed grayscales. This segmentation enables independent optimization of imaging and positioning functions without mutual interference.
Solution Approach 2:
Different regions of the pixel array are assigned different functional qualities. Photosensitive pixel units possess light-sensitive properties for dynamic image capture, while alignment pixel units have fixed grayscale properties for stable positioning references. The first and second alignment pixel units exhibit locally distinct grayscale characteristics (black vs white), providing differentiated positioning markers in different spatial locations.
2Manufacturing precision
If multiple alignment pixel units with different fixed grayscales are used, then charge image positioning accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The alignment pixel units are pre-configured with fixed grayscale values during the manufacturing process, establishing stable positioning references before actual imaging operations. The first alignment pixel units are preliminarily set to normally black state, while second alignment pixel units are set to normally white state, creating predetermined positioning markers that simplify subsequent image processing and positioning tasks.
3Reliability
If alignment pixel units with fixed grayscale are incorporated, then image synthesis quality is improved, but the detector structure becomes more complex
Solution Approach 1:
Alignment pixel units serve as intermediary elements between the imaging system and the positioning requirements. These units with fixed grayscales act as stable reference markers that mediate the positioning process, enabling accurate charge image localization without requiring complex real-time processing. The first (black) and second (white) alignment pixel units provide complementary reference points for robust positioning.
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 solution ensures that real-time charge images are consistently positioned within the image acquisition region, enhancing the accuracy and reliability of image synthesis, particularly in dynamic X-ray exposure scenarios, and improves the quality of the final image by maintaining alignment and grayscale consistency.
Implementation Method 1
Each of the plurality of photosensitive pixel units comprises a photoelectric sensor, and the photoelectric sensor is configured to convert an incident light into an electrical signal
Data Source
AI summary
A flat panel detector and an imaging system are provided. The flat panel detector includes a plurality of pixel units which include photosensitive pixel units and alignment pixel units. Each photosensitive pixel unit includes a photoelectric sensor configured to convert an incident light into an electrical signal so that a photosensitive pixel unit in which the photoelectric sensor is located has a grayscale that changes according to a real-time change of the incident light. Each alignment pixel unit is configured to have a fixed grayscale, and the fixed grayscale does not change according to the real-time change of the incident light. The alignment pixel units includes first alignment pixel units and second alignment pixel units. Each first alignment pixel unit has a first fixed grayscale, each second alignment pixel unit has a second fixed grayscale different from the first fixed grayscale.