X-ray Detection Circuit Noise Verification
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Solution Overview
Problem
Existing radiation image detecting devices are prone to wrong detection of X-ray irradiation start due to noise from external factors like vibration, leading to unnecessary operations and potential medical errors, as they rely on detecting bias current fluctuations which are sensitive to noise.
Innovation Solution
A radiation image detecting device with a first judgment unit that detects the start of X-ray irradiation based on electric signal variation and a second judgment unit that verifies this detection by analyzing signal fluctuation over time, using threshold values and differentiation circuits to distinguish between actual irradiation and noise-induced signals, ensuring accurate operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the device detects the start of X-ray irradiation by monitoring bias current fluctuations, then the device can operate without electrical connection to the X-ray generation device, but the detection becomes highly sensitive to noise from vibration and external factors
Solution Approach 1:
The detection process is divided into two independent stages: a first judgment unit that performs initial detection of irradiation start based on bias current fluctuations, and a second judgment unit that performs verification by analyzing signal characteristics. This segmentation allows the system to maintain operational independence while improving detection reliability through multi-stage validation.
Solution Approach 2:
The second judgment unit provides feedback verification of the first judgment unit's detection results. By analyzing the temporal characteristics and magnitude of signal changes, the verification unit confirms whether the detected fluctuation truly represents irradiation start or is merely noise, thereby improving overall detection accuracy.
2Productivity
If the device uses a single threshold comparison method for detecting irradiation start, then the detection process is simple and fast, but wrong detections occur due to noise-induced signal fluctuations
Solution Approach 1:
The detection system is divided into two functional units: the first judgment unit performs rapid initial detection using threshold comparison to maintain fast response, while the second judgment unit performs more rigorous verification by analyzing signal characteristics over time. This segmentation preserves detection speed at the initial stage while improving accuracy through subsequent verification.
Solution Approach 2:
The first judgment unit performs preliminary detection to quickly identify potential irradiation start events, allowing the system to respond rapidly to actual irradiation while filtering out noise through the subsequent verification process in the second judgment unit.
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 effectively prevents wrong detections caused by noise, ensuring that the device only initiates charge accumulation when actual X-ray irradiation has started, thereby reducing power waste and minimizing the risk of medical errors.
Implementation Method 1
each pixel includes a photodiode for accumulating signal charge in accordance with the amount of light incident thereon
Data Source
AI summary
When all TFTs are turned on, an electric signal is compared with a first threshold value. If the electric signal is equal to or more than the first threshold value, a first judgment unit judges that X-ray irradiation has been started. A second judgment unit compares second and third threshold values with a first-order differentiation value of an electric signal that is outputted in a state of turning off all the TFTs. If the first-order differentiation value is within or out of a range defined by the second and third threshold values throughout a verification period, the second judgment unit verifies that the judgment of the first judgment unit is correct. When the judgment of the first judgment unit is verified to be correct, the TFTs are kept turned off, and an FPD continuously carries out charge accumulation operation for capturing an X-ray image.