Radiation Imaging Pixel Crosstalk Correction
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Solution Overview
Problem
Existing radiation imaging apparatuses face challenges in accurately correcting signals due to crosstalk caused by parasitic capacitances, which affects the reliability of radiation detection, especially when the number and sensitivity of detection and correction pixels differ, and variations in radiation intensity distribution across the imaging plane.
Innovation Solution
The apparatus employs a configuration with first and second detection pixels having different sensitivities, connected to respective signal lines, and a reading circuit that samples signals in both conductive and non-conductive states to generate corrected information using a signal processing circuit, which accounts for crosstalk and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction pixels with different sensitivity are used to detect crosstalk, then crosstalk detection capability is improved, but the number of pixels and device complexity increase
Solution Approach 1:
The imaging region is divided into multiple pixel areas, with each pixel area containing both detection pixels and correction pixels. This segmentation allows crosstalk to be measured and corrected locally for each region, improving correction accuracy while distributing the pixel count across multiple functional units rather than requiring a single large array of correction pixels
Solution Approach 2:
Different pixel areas have different numbers of detection pixels and correction pixels arranged according to local radiation intensity distribution characteristics. Regions with higher radiation intensity allocate more correction pixels to handle stronger crosstalk signals, while regions with lower intensity use fewer pixels, optimizing the balance between correction accuracy and overall device complexity
2Adaptability or versatility
If the number of detection pixels and correction pixels varies across pixel areas, then adaptation to radiation intensity distribution is improved, but manufacturing precision requirements increase
Solution Approach 1:
Each pixel area is designed with an asymmetric configuration where the ratio of detection pixels to correction pixels varies according to the expected radiation intensity distribution. This asymmetric design allows the system to adapt to different imaging conditions (e.g., chest imaging vs. extremity imaging) while maintaining a regular overall array structure that simplifies manufacturing
Solution Approach 2:
The optimal number and arrangement of detection and correction pixels in each pixel area are predetermined based on expected radiation intensity distributions for different imaging types. This preliminary configuration allows the system to be manufactured with fixed patterns that automatically adapt to different imaging scenarios without requiring complex real-time adjustments or high-precision variable positioning
3Measurement precision
If crosstalk correction is performed using signals from detection and correction pixels, then signal accuracy is improved, but processing complexity increases
Solution Approach 1:
Crosstalk signals are measured and stored in advance during a calibration phase before actual imaging. The information processing circuit uses these pre-measured crosstalk characteristics to correct detection pixel signals during imaging, avoiding the need for complex real-time crosstalk calculation and reducing processing complexity while maintaining high signal accuracy
Solution Approach 2:
The system creates a digital model or copy of the crosstalk characteristics based on measurements from correction pixels, then uses this copied crosstalk profile to correct signals from detection pixels. This copying approach simplifies the correction process by replacing complex physical crosstalk analysis with straightforward digital signal processing using the stored crosstalk model
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 the accuracy of radiation detection by effectively correcting for crosstalk and temperature-induced changes, enhancing the reliability of radiation imaging by ensuring accurate signal processing and reducing false positives.
Implementation Method 1
a first detection pixel including a first switch element and a second detection pixel including a second switch element and having sensitivity to detection of a radial ray which is different from sensitivity of the first detection pixel
Implementation Method 2
non-negligible parasitic capacitances between electrodes of the pixels for obtaining a radiation image and the detection signal line. Crosstalk may be generated through the parasitic capacitances due to variation of potentials of the electrodes of the pixels for obtaining a radiation image generated by irradiation with a radial ray
Data Source
AI summary
A radiation imaging apparatus includes a first detection pixel including a first switch element, a second detection pixel including a second switch element and having sensitivity which is different from that of the first detection pixel, a first signal line, a second signal line, a reading circuit which performs a first operation of reading first and second signals which appear in the first and second signal lines in a state in which the first and second switch elements are in a non-conductive state while the radiation imaging apparatus is irradiated with a radial ray and a second operation of reading third and fourth signals which appear in the first and second signal lines when the first and second switch elements are brought into a conductive state, and an information processing circuit which performs a process of generating information based on the first to fourth signals.