Radiation Imaging Sensor Array Central Region Signal Extraction
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Solution Overview
Problem
Radiation imaging apparatuses face nonuniform sensitivity due to variations in light distribution across sensors, despite having uniform scintillator layer luminance efficiency, leading to suboptimal image quality.
Innovation Solution
A radiation imaging apparatus with a sensor panel featuring a central region and a peripheral region, where the scintillator layer is uniformly deposited over both areas by direct vapor deposition or coating, and only signals from the central region are used for signal processing to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scintillator layer is formed with uniform luminance efficiency, then the light generation uniformity is improved, but the light distribution to sensors becomes nonuniform due to geometric factors
Solution Approach 1:
The patent applies local quality by differentiating the treatment of peripheral and central sensor regions. The scintillator layer is formed with different thicknesses or compositions in peripheral versus central regions to compensate for geometric light loss, ensuring each region receives appropriate light intensity for uniform overall performance.
Solution Approach 2:
The patent implements preliminary anti-action by pre-compensating for the known geometric light loss in peripheral regions during the scintillator layer formation process. By adjusting the scintillator properties in advance for peripheral areas, the system counteracts the inevitable light distribution imbalance before signal processing occurs.
2Area of stationary object
If all sensor signals are used for image processing, then the image coverage is maximized, but the image quality deteriorates due to nonuniform sensor characteristics
Solution Approach 1:
The patent applies the extraction principle by selectively using only signals from the central sensor region while excluding peripheral region signals from the image processing. This extraction of high-quality central signals ensures uniform image characteristics, accepting that some peripheral area coverage is sacrificed for maintained image quality.
Solution Approach 2:
The patent segments the sensor array into central and peripheral regions with distinct functional treatment. The central region is used for primary image generation due to its uniform characteristics, while the peripheral region is either excluded or used for supplementary purposes, creating a segmented approach to optimize overall image quality.
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 radiation image quality by utilizing uniformly characterized sensors, reduces differences in sensor characteristics, and increases the effective central region for image generation, thereby enhancing the reliability and uniformity of the imaging process.
Implementation Method 1
a scintillator layer which converts radiation into light
Implementation Method 2
a sensor array having a plurality of sensors which perform photoelectric conversion
Implementation Method 3
the scintillator layer is disposed over the peripheral region and the central region by direct vapor deposition or direct coating
Data Source
AI summary
A radiation imaging apparatus, comprising a sensor panel including a sensor array on which a plurality of sensors arranged in an array form and a scintillator layer provided on the sensor array, and a unit configured to perform signal processing based on a signal from the sensor array, wherein the sensor array includes a peripheral region and a central region located inside the peripheral region, the scintillator layer is disposed over the peripheral region and the central region so as to have uniform luminance efficiency with respect to the sensor array, and the unit performs the signal processing by using only signals from sensors disposed in the central region, of signals from the plurality of sensors, output from the sensor panel.