Radiation Imaging Controller Row Synchronization Shading
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Solution Overview
Problem
In radiation imaging systems using FPDs, fluoroscopic imaging can suffer from shading due to varying signal accumulation times across rows during line exposure sequential readout, leading to suboptimal image quality when imaging is interrupted.
Innovation Solution
A radiation imaging system with a controller that manages radiation irradiation and image data generation row-by-row, ensuring consistent radiation exposure times by stopping irradiation after completing the accumulating and readout operations of the last row, and displaying the last image data generated before termination to prevent shading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous radiation irradiation is performed during fluoroscopic imaging with line exposure sequential readout, then imaging speed and productivity are improved, but signal accumulation time varies across rows causing shading and deteriorating image quality
Solution Approach 1:
The system performs preliminary actions by completing the accumulating operation for all rows before initiating the readout operation. This ensures that signal accumulation time is equalized across all rows, preventing shading while maintaining continuous irradiation for high imaging speed
Solution Approach 2:
The imaging process is segmented into distinct phases: an accumulating operation phase where all rows accumulate signals simultaneously during continuous irradiation, followed by a readout operation phase where signals are read out row by row. This segmentation allows equal accumulation time across rows while maintaining continuous irradiation
2Object-affected harmful factors
If radiation irradiation is stopped immediately when termination is instructed, then radiation safety is improved, but the last image may be incomplete or shaded due to ongoing row-by-row readout
Solution Approach 1:
When termination is instructed, the system performs a preliminary action by completing the accumulating operation for all rows before stopping irradiation. This ensures all rows have equal accumulation time and produces a complete, non-shaded last image while still minimizing unnecessary radiation exposure
Solution Approach 2:
The system uses feedback from the termination instruction to dynamically adjust the irradiation timing. It monitors the completion status of the accumulating operation and coordinates the irradiation stop timing to ensure all rows have completed accumulation, preventing shading while minimizing radiation exposure
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 improves image quality by maintaining consistent radiation exposure times across rows, reducing shading and enhancing the clarity of images displayed during interrupted fluoroscopic imaging.
Implementation Method 1
a scintillator 205 and a photoelectric conversion element 206
Implementation Method 2
a scintillator 205 and a photoelectric conversion element 206
Data Source
AI summary
A radiation imaging system comprising a radiation imaging apparatus in which pixels are arranged, a radiation source, a display unit, and a controller is provided. The controller causes, during radiation irradiation, the radiation imaging apparatus to repeat a generation operation of generating one image data by causing the pixels to perform an accumulating operation and a readout operation. When it is instructed to terminate the radiation irradiation, the controller causes the radiation source to stop the radiation irradiation in accordance with completion of the accumulating operation and the readout operation of the last row in the generation operation during which it was instructed to terminate the radiation irradiation, and causes the display unit to display an image based on last image data generated by the generation operation during which it was instructed to terminate the radiation irradiation.