Dynamic Integration Interval for Radiation Detection
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Solution Overview
Problem
Current radiation imaging apparatuses face challenges in accurately detecting radiation irradiation across varying intensities and durations, leading to potential artifacts or missed detections due to long integration times for weak radiation or short integration times for strong radiation.
Innovation Solution
A radiation imaging apparatus with a pixel array, detection circuit, and control unit that dynamically adjusts feedback impedance to enhance detection sensitivity during irradiation, using techniques like Correlated Double Sampling and frame correction to process bias current signals and determine the start and end of radiation exposure accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long integration interval is used for detecting radiation irradiation, then detection reliability for weak radiation is improved, but the time required for detection increases causing artifacts in images
Solution Approach 1:
The patent applies dynamics by making the integration interval variable rather than fixed. The control unit dynamically adjusts the integration interval length based on the detected radiation intensity: using longer intervals for weak radiation to ensure reliable detection, and shorter intervals for strong radiation to prevent detection delays that cause artifacts. This dynamic adaptation resolves the contradiction between detection reliability and detection time.
2Loss of time
If a short integration interval is used for detecting radiation irradiation, then detection time is reduced preventing image artifacts, but detection reliability fails for weak radiation
Solution Approach 1:
The system dynamically adjusts the integration interval based on real-time radiation intensity measurements. When weak radiation is detected, the system extends the integration interval to accumulate sufficient signal for reliable detection. When strong radiation is detected, the system shortens the interval to enable rapid detection and prevent artifacts, thus resolving the contradiction between detection time and reliability.
3Productivity
If the radiation generator uses high output for short irradiation time, then image quality is improved by preventing motion blur, but detection accuracy decreases due to insufficient signal accumulation
Solution Approach 1:
The control unit dynamically adjusts the integration interval to match the irradiation conditions. For short, high-output radiation exposure, the system uses a shorter integration interval that is sufficient to detect the strong signal while maintaining fast imaging capability. This dynamic adjustment ensures both high imaging speed and accurate radiation detection under varying exposure conditions.
4Measurement precision
If the radiation generator uses low output for long irradiation time, then detection signal is strengthened, but image quality deteriorates due to motion blur
Solution Approach 1:
The system dynamically adapts the integration interval to the actual radiation output and exposure time. For long-duration low-output radiation, the control unit extends the integration interval to accumulate sufficient signal for accurate detection while maintaining synchronization with the extended exposure time. This allows the system to achieve both high detection accuracy and proper imaging timing without motion blur.
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
Enables precise detection of radiation irradiation regardless of intensity or duration, reducing noise and artifacts, and ensuring reliable image capture across different radiation conditions.
Implementation Method 1
a radiation detection element configured to detect radiation irradiation and generate an electrical signal in response to the radiation
Data Source
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AI summary
A radiation imaging apparatus includes a pixel array in which a plurality of pixels which detects radiation are arrayed to form a plurality of rows and a plurality of columns, a detection circuit which detects information having correlation to a radiation dose to the pixel array and output a detection signal corresponding to the information, and a control unit which detects radiation irradiation to the pixel array based on a plurality of integrated values obtained by integrating one of the detection signal and a result of processing applied to the detection signal in a plurality of integral intervals and control the pixel array in accordance with the detection.