X-ray Detector Dummy Pixel Noise Removal
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Solution Overview
Problem
Existing x-ray detectors face challenges in effectively removing noise from x-ray images, leading to degraded image quality due to non-uniformity and line noise, which affects the accuracy of internal subject state observation.
Innovation Solution
The x-ray detector incorporates photosensitive pixels for generating effective images and dummy pixels in a non-active area, with switching devices in the dummy pixels maintaining a turned-off state to block electric signals, allowing simultaneous irradiation and signal acquisition without time differences, enabling real-time noise removal from the effective image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dummy pixels are added to remove line noise, then image quality is improved, but device complexity increases
Solution Approach 1:
The detector is segmented into active area pixels and dummy pixels in non-active area, allowing independent noise measurement and correction without adding complex external equipment
Solution Approach 2:
Dummy pixels serve as an intermediary element that measures line noise characteristics, enabling noise correction through signal processing rather than physical filtering
2Measurement precision
If separate noise correction units are used, then noise removal effectiveness is improved, but device complexity and space requirements increase
Solution Approach 1:
The noise correction functionality is merged into the detector structure itself by incorporating dummy pixels within the same detector array, eliminating the need for separate external noise correction units
Solution Approach 2:
The dummy pixels perform multiple functions: they measure line noise, enable real-time noise correction, and work integrated with the active pixels to provide both imaging and noise characterization capabilities
3Measurement precision
If time-differentiated signal acquisition is used for noise correction, then noise removal accuracy is improved, but measurement time increases
Solution Approach 1:
The dummy pixels continuously measure line noise characteristics in real-time during the imaging process, eliminating the need for separate pre-characterization measurements and time-differentiated acquisition sequences
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 approach improves image quality by effectively removing line noise and enhancing the accuracy of internal subject state observation, reducing the need for separate noise correction units and time-differentiated signal acquisition.
Implementation Method 1
a first photodiode generating an electric signal corresponding to an x-ray
Data Source
AI summary
An x-ray detector includes a plurality of photosensitive pixels each including a first photodiode generating an electric signal corresponding to an x-ray, and a first switching device turned on by a gate signal and outputting the electric signal from the photodiode through a data line, and a plurality of dummy pixels each including a second photodiode generating an electric signal corresponding to an x-ray, and a second switching device maintaining a turned-off state regardless of a gate signal and blocking the electric signal from being output from the second photodiode to the data line.