Radiographic Image Conversion Panel with Spaced Columnar Crystals
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Solution Overview
Problem
Conventional radiographic image conversion panels are insufficient in terms of strength when subjected to pressure in the film thickness direction, despite achieving high brightness and sharpness.
Innovation Solution
The panels are configured with a scintillator layer composed of columnar crystals having independent root portions that are spaced apart, enhancing durability and resistance to pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the scintillator layer is made thicker to improve luminous efficiency and brightness, then the signal-to-noise ratio is enhanced, but the light scattering increases and image sharpness deteriorates
Solution Approach 1:
The scintillator layer is segmented into multiple independent columnar crystals rather than a continuous solid layer. This segmentation allows light to be emitted from multiple discrete columns, reducing lateral light scattering while maintaining total light output. The columnar structure creates independent light emission paths that preserve image sharpness even at increased thickness.
Solution Approach 2:
The columnar crystals are arranged with specific spatial characteristics where each column has optimized local properties. The columnar shape provides directional light emission along the crystal axis, while the spacing between columns creates local void regions that reduce light scattering. This local structural optimization allows simultaneous achievement of high brightness and sharpness.
2Use of energy by moving object
If the scintillator layer thickness is increased to improve luminous efficiency, then more X-rays are converted to visible light, but the structural strength in the film thickness direction becomes insufficient
Solution Approach 1:
The scintillator layer is divided into multiple independent columnar crystals rather than a continuous solid structure. This segmentation creates discrete load-bearing elements distributed throughout the layer, which collectively provide superior mechanical strength compared to a solid layer of equivalent thickness. The columnar structure acts as multiple reinforcement pillars that resist compression and bending forces.
Solution Approach 2:
The scintillator layer forms a composite structure consisting of columnar crystal phases distributed within a matrix material. This composite architecture combines the high X-ray conversion efficiency of the crystal phases with the mechanical strength provided by the distributed columnar structure, achieving both luminous efficiency and structural integrity.
3Manufacturing precision
If columnar crystals are used to improve light emission efficiency and sharpness, then brightness and image quality are enhanced, but the structural strength under pressure is reduced
Solution Approach 1:
The columnar crystal structure segments the scintillator layer into multiple independent load-bearing columns. When pressure is applied, this segmentation distributes the mechanical stress across numerous discrete elements rather than concentrating it in a continuous structure. The columnar geometry provides inherent compression resistance along the vertical axis while maintaining the sharpness benefits of the columnar light emission pattern.
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 configuration ensures high levels of brightness, sharpness, and durability, effectively addressing the strength limitations of conventional panels under pressure.
Implementation Method 1
a phosphor layer which includes columnar crystals containing a phosphor base material and an activator... when illuminated with X-rays, convert the radiations into visible light that is emitted
Data Source
AI summary
An object of the invention is to provide radiographic image conversion panels which realize high levels of brightness and sharpness when used as scintillator panels and which also ensure sufficient strength resisting pressure applied in the film thickness direction. A radiographic image conversion panel of the invention includes a support and a scintillator layer disposed on the support. The scintillator layer includes a plurality of columnar crystals containing a phosphor. The plurality of columnar crystals have root portions, and the root portions are spaced apart from one another.