Radiation Image Capturing System Self-Detection and Line Defect Correction
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Solution Overview
Problem
Conventional radiation image capturing systems face challenges in self-detecting irradiation without an interface with the radiation generator, leading to potential line defects in the images due to noise interference and delayed detection sensitivity, which can result in diagnostic errors.
Innovation Solution
A radiation image capturing system equipped with a detecting section of scanning and signal lines, a scanning drive unit, switch units, a reading circuit, and a control device that alternately reads leak data and resets radiation detection elements to detect irradiation start and correct line defects in the image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radiation image capturing apparatus self-detects irradiation without an interface with the radiation generator, then the apparatus can operate independently and portably, but line defects occur due to noise interference and delayed detection sensitivity
Solution Approach 1:
The system performs preliminary actions by continuously monitoring the cumulative charge amount before irradiation occurs. The control device detects irradiation start timing by comparing the cumulative charge amount against a threshold value, enabling the system to prepare for and respond to irradiation events without requiring an interface with the radiation generator, thus maintaining independent operation while ensuring reliable detection
Solution Approach 2:
The system implements feedback by continuously measuring the cumulative charge amount in the radiation detection elements and using this information to detect irradiation start timing. The control device adjusts its detection based on the feedback from charge accumulation levels, allowing the system to accurately identify irradiation events and prevent line defects while maintaining portable independent operation
2Productivity
If the scanning drive unit sequentially applies on-voltage to scanning lines for reading image data, then the system can read out data from all detection elements, but line defects occur in the read data due to noise interference
Solution Approach 1:
The control device uses feedback from the cumulative charge amount to determine irradiation start timing. By detecting when the cumulative charge exceeds a threshold, the system can identify which scanning lines were active during irradiation and selectively correct or exclude data from those lines, thereby maintaining complete data reading while improving image data accuracy by eliminating noise-induced line defects
Solution Approach 2:
The system applies local quality by treating different scanning lines differently based on their charge accumulation characteristics. Lines that show significant charge accumulation indicative of irradiation are identified and handled separately through correction or exclusion, while other lines are processed normally, thus preserving overall data completeness while improving local data accuracy
3Measurement precision
If the control device detects irradiation start by monitoring cumulative charge amount, then the system can accurately identify irradiation timing, but the detection sensitivity is delayed compared to interface-based systems
Solution Approach 1:
The system performs preliminary monitoring of cumulative charge amounts continuously before irradiation occurs. By maintaining readiness to detect charge accumulation and having the control device continuously compare against threshold values, the system minimizes detection delay while maintaining accurate irradiation timing identification, bridging the gap between precision and response time
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 self-detection of irradiation and correction of line defects, ensuring accurate and clear radiation images without interface dependency, improving diagnostic reliability.
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 in response to the energy of the electromagnetic wave having been converted and applied
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
In a radiation image capturing system, prior to radiation image capturing operation, the radiation image capturing apparatus repeats on an alternate basis, a step of reading leak data and a step of resetting each of the radiation detection elements, wherein the step of reading leak data is performed by turning off all switch units, allowing a reading circuit to perform cyclic reading operations under this condition and converting electric charge leaking out of radiation detection elements through the switch units into the leak data, thereby detecting a start of irradiation based on the leak data having been read out. The image processing apparatus analyzes a profile of image data along the extension of signal lines of the radiation image capturing apparatus, and identifies a range of the image data where a defect has occurred, whereby the image data in the identified range is corrected.