Radiation Imaging Detection Elements Crosstalk Correction
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Solution Overview
Problem
Existing radiation imaging apparatuses face challenges in accurately measuring radiation detection due to crosstalk and temperature-induced changes in characteristics of thin film transistors and photoelectric conversion elements, which limit the correction of crosstalk and affect measurement accuracy.
Innovation Solution
A radiation imaging apparatus with a plurality of detection elements, including a first detection element and a second detection element connected to the same signal line, where the sensitivity of the first detection element is set to be different from the second detection element, and a signal processing circuit generates information based on signals from both elements to correct for crosstalk and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a signal line is used to read out signals from detection elements, then the radiation detection function is achieved, but crosstalk occurs between the signal line and adjacent pixels causing measurement inaccuracy
Solution Approach 1:
The patent introduces a correction element as an intermediary component that detects the crosstalk signal generated between the signal line and adjacent pixels. By measuring the crosstalk through this intermediary element and subtracting it from the detection element signal, the patent achieves accurate radiation measurement while maintaining the necessary signal line routing.
Solution Approach 2:
The patent extracts the crosstalk component from the total signal by using a correction element that only receives crosstalk interference without radiation exposure. This separated crosstalk signal is then removed from the detection element output, leaving only the accurate radiation measurement.
2Adaptability or versatility
If thin film transistors and photoelectric conversion elements are used in detection elements, then the radiation imaging function is achieved, but temperature changes cause characteristic variations including leakage current and dark current changes
Solution Approach 1:
The patent implements a feedback mechanism where correction elements continuously monitor temperature-induced characteristic variations and offset level changes. This feedback information is used to compensate for drift in detection element performance, maintaining reliable radiation imaging across varying temperature conditions.
Solution Approach 2:
The patent creates copies of the detection element structure as correction elements that replicate the temperature-dependent characteristics without receiving radiation exposure. These copies serve as reference models for compensating the actual detection element signals, maintaining reliability under temperature variations.
3Measurement precision
If correction elements are added to correct crosstalk and temperature effects, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the imaging device into distinct functional units: radiation detection elements for primary measurement and correction elements for interference compensation. This segmentation allows independent optimization of each function while maintaining overall system simplicity through modular architecture.
Solution Approach 2:
The patent designs correction elements that serve multiple functions: detecting crosstalk signals, monitoring temperature effects, and providing offset reference levels. This multi-functionality reduces the need for separate correction mechanisms, thereby limiting the increase in device complexity while achieving comprehensive signal correction.
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 effectively reduces the influence of crosstalk and temperature-related changes, enabling accurate measurement of radiation detection and improving the accuracy of radiation imaging by using the difference in signals from the detection and correction elements.
Implementation Method 1
a conversion element configured to convert radiation into an electric signal
Data Source
AI summary
An imaging region including a plurality of detection elements each including a conversion element configured to convert radiation into an electric signal, a first signal line, and a signal processing circuit configured to process a signal output via the first signal line, wherein the plurality of detection elements include a first detection element and a second detection element which are connected to the first signal line, a sensitivity of the first detection element to radiation is set to be different from a sensitivity of the second detection element to radiation, and the signal processing circuit generates information related to irradiation of radiation to the imaging region based on signals from the first detection element and the second detection element which are connected to the first signal line.