Radiographic Imaging Device Noise-Adaptive Detection Control
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Solution Overview
Problem
Radiographic imaging devices with automatic radiation detection functions often experience false detection of radiation irradiation start due to noise from external sources, leading to inappropriate timing for transitioning to accumulation operations and affecting image quality, especially in noisy environments.
Innovation Solution
A radiographic imaging device that generates a variation indicator value for noise levels and adjusts the threshold value or amplification gain based on real-time noise data to reduce false detection, using noise data generation and amplification circuit control to minimize false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed threshold value is used for radiation detection, then the device structure is simple, but false detection occurs in noisy environments
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring noise levels and adapting the detection threshold accordingly. The control unit calculates noise levels from detector signals during non-irradiation periods and dynamically sets the threshold based on these measurements, allowing the system to adapt to changing environmental noise conditions rather than using a fixed threshold value.
Solution Approach 2:
The system employs feedback mechanisms where the detected noise level is fed back into the threshold setting process. The control unit continuously measures noise from the detector, processes this information, and uses it to adjust the threshold value for radiation detection, creating a closed-loop system that self-regulates based on actual environmental conditions.
2Measurement precision
If detection sensitivity is increased to detect low-level radiation, then radiation detection capability is improved, but false detection from noise increases
Solution Approach 1:
The patent changes the parameter of detection threshold dynamically based on noise level measurements. By adjusting the threshold parameter according to actual noise conditions rather than using a fixed value, the system maintains high sensitivity for detecting low-level radiation while adapting the threshold to prevent false detections from environmental noise variations.
3Reliability
If automatic noise compensation is implemented, then false detection is reduced, but processing time increases
Solution Approach 1:
The system performs preliminary noise level measurements during non-irradiation periods before actual radiation detection begins. By pre-measuring and establishing baseline noise levels and thresholds in advance, the system prepares the detection parameters ahead of time, reducing the processing burden during actual radiation events while maintaining accurate noise compensation.
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
The solution effectively reduces false detection of radiation irradiation start in noisy environments by dynamically adjusting detection sensitivity, ensuring accurate timing for accumulation operations and improving image capture quality.
Implementation Method 1
a sensor portion that generates an output signal according to an irradiated amount of irradiated radiation
Data Source
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AI summary
A radiographic imaging device including: a sensor portion that generates an output signal according to an irradiated amount of irradiated radiation; a detection means that based on the output signal detects a radiation irradiation start of radiation irradiated from a radiation source during capture of a radiographic image; a noise data generation means that, based on an output signal from the sensor portion in a non-irradiation state of radiation from the radiation source, generates noise data relating to noise incorporated in the output signal; a control means that controls detection sensitivity to radiation irradiation start in the detection means according to a degree of variation in noise level expressed by the noise data; and an imaging means that captures the radiographic image after radiation irradiation start has been detected by the detection means.