Flat Panel Detector Alignment Pixels for Charge Image Positioning
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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 imaging quality and efficiency.
Innovation Solution
The flat panel detector incorporates a combination of photosensitive and alignment pixel units with fixed grayscales, where alignment pixel units with distinct grayscales are used to identify and maintain the position of charge images within a preset region, ensuring accurate alignment and positioning through a system of alignment marks and a position controller unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alignment pixel units with distinct grayscales are introduced to improve positioning accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detector array is segmented into two functional types of pixel units: photosensitive pixel units for capturing X-ray images 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), creating distinct grayscale markers that facilitate accurate positioning without requiring complex external positioning systems.
2Manufacturing precision
If multiple types of pixel units are used to achieve accurate alignment, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
Different regions of the detector array are assigned different functional qualities: photosensitive pixel units are configured to respond to X-ray photons, while alignment pixel units are configured with fixed grayscale values (normally black or normally white). This local differentiation enables accurate alignment marking without requiring complex post-manufacturing calibration, as the alignment functionality is built into the local structure of specific pixel units.
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 enables precise alignment and positioning of charge images, improving the accuracy and reliability of image synthesis, enhancing imaging quality and efficiency by ensuring all real-time charge images are located within the image acquisition region, facilitating the generation of ideal final images, including three-dimensional images.
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.