Radiation Image Detector Irradiation Start Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radiation image capturing apparatuses face challenges in accurately detecting the start of irradiation due to periodic fluctuations in leak data and image data, leading to incorrect detection and inefficient battery usage.
Innovation Solution
A radiation image capturing apparatus with a control device that repeatedly reads leak data or image data prior to the radiation image capturing operation, applying on-voltage to scanning lines and using threshold values to detect the start of irradiation, and subtracting a previously obtained fluctuation pattern from the read data to minimize incorrect detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the radiation image capturing apparatus uses a threshold value to detect the start of irradiation, then the detection speed is improved, but incorrect detection occurs due to periodic fluctuations in leak data
Solution Approach 1:
The control device performs preliminary actions by repeatedly reading leak data or image data before the radiation image capturing operation starts, and obtains a fluctuation pattern of the read data. This preliminary fluctuation pattern is then subtracted from subsequently read data to eliminate periodic fluctuations, allowing the threshold-based detection to work accurately without false positives.
Solution Approach 2:
The system uses feedback by continuously monitoring leak data or image data and comparing it against the previously obtained fluctuation pattern. The control device subtracts the fluctuation pattern from the read data and determines whether the resulting value exceeds the threshold, creating a feedback mechanism that adapts to periodic variations and improves detection reliability.
2Measurement precision
If the control device repeatedly reads leak data or image data prior to radiation image capturing operation, then detection accuracy is improved, but battery power consumption increases
Solution Approach 1:
The control device performs repeated readings of leak data or image data only partially - specifically during the period before radiation image capturing operation begins. Once the irradiation start is detected through the fluctuation pattern subtraction method, the repeated readings are stopped. This partial application of the measurement action achieves sufficient detection accuracy while limiting unnecessary energy consumption.
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 avoids incorrect detection of irradiation start, reduces battery power consumption, and enhances image capturing efficiency by accurately determining when irradiation has begun.
Implementation Method 1
a so-called indirect radiation image capturing apparatus that uses a scintillator etc. to convert the applied radiation into electromagnetic waves having other wavelengths such as visible light, then generates an electric charge through a photoelectric conversion element such as a photodiode
Implementation Method 2
a so-called indirect radiation image capturing apparatus that uses a scintillator etc. to convert the applied radiation into electromagnetic waves having other wavelengths such as visible light
Data Source
AI summary
A control device of a radiation image capturing apparatus performs repeated reading of leak data prior to radiation image capturing operation and, when a threshold value has been exceeded by the leak data having been read out, said control device detects the start of irradiation. If there are periodic fluctuations in the leak data read out prior to radiation image capturing operation even though irradiation has not started, said control device determines whether or not a threshold value has been exceeded by a value obtained by subtracting a previously obtained fluctuation pattern of the leak data from the read-out leak data during a time period including at least a time period when the leak data fluctuates.