Radiological Image Conversion Panel Porosity Gradient
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Solution Overview
Problem
The radiological image conversion panel described in Patent Literature 3 has a spherical crystal layer with higher porosity, which limits its ability to achieve both improved adhesion with the support and enhanced sensitivity through light reflection, as the domain layer with aggregated spherical crystals mitigates stress but has relatively low porosity, and the columnar section's low porosity restricts light reflection efficiency.
Innovation Solution
A radiological image conversion panel with a phosphor comprising a columnar section and a non-columnar section, where the non-columnar section has a higher porosity at the columnar section side than at the support side, formed by varying the deposition rate of crystals during vapor deposition, allowing for improved adhesion and sensitivity through optimized porosity and light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a spherical crystal layer with high porosity is formed at the support side, then light reflection efficiency is improved, but adhesion with the support deteriorates
Solution Approach 1:
The non-columnar section is divided into multiple layers with different porosity levels. The first layer (closer to support) has lower porosity for adhesion, while the second layer (closer to columnar section) has higher porosity for light reflection, resolving the contradiction between adhesion and light reflection efficiency
Solution Approach 2:
Different porosity levels are assigned to different regions of the non-columnar section. The region closer to the support has lower porosity for strong adhesion, while the region closer to the columnar section has higher porosity for enhanced light reflection, allowing each region to optimize its local function
2Stability of the object's composition
If a domain layer with aggregated spherical crystals is formed, then stress mitigation is improved, but porosity decreases limiting light reflection
Solution Approach 1:
The non-columnar section is segmented into layers with different porosity levels. The first layer provides stress mitigation through aggregated crystals, while the second layer maintains higher porosity for light reflection, allowing both functions to coexist in different regions
Solution Approach 2:
The solution moves from a single-layer structure to a multi-layer structure, adding the dimension of vertical stratification. This allows stress mitigation and light reflection to be optimized at different heights within the non-columnar section
3Strength
If the contact area between non-columnar section and support is increased, then adhesion is improved, but light reflection efficiency deteriorates
Solution Approach 1:
The non-columnar section is divided into layers where the first layer has larger contact area with the support for adhesion, while the second layer has optimized porosity for light reflection, separating the two functions vertically
Solution Approach 2:
The first layer of the non-columnar section has properties optimized for adhesion (lower porosity, larger contact area), while the second layer has properties optimized for light reflection (higher porosity), allowing each layer to perform its specific function effectively
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 enhances both the adhesion of the phosphor with the support and the sensitivity of the radiological image detection apparatus by optimizing the porosity of the non-columnar section, leading to improved image sharpness and reduced exposure dose.
Implementation Method 1
a phosphor which is formed on the support and contains a fluorescent material that emits fluorescence by radiation exposure
Implementation Method 2
the columnar crystals are obtained through columnar growth of crystals of a fluorescent material... has a light guide effect of guiding the fluorescence emitted therefrom in the growth direction of the crystals
Implementation Method 3
formed by depositing crystals of the fluorescent material on the support by a vapor deposition method
Data Source
AI summary
A radiological image conversion panel 2 provided with a support 11 and a phosphor 18 which is formed on the support and contains a fluorescent material that emits fluorescence by radiation exposure. The phosphor includes a columnar section 34 formed by a group of columnar crystals which are obtained through columnar growth of crystals of the fluorescent material, and a non-columnar section 36. The columnar section and the non-columnar section are integrally formed to overlap in a crystal growth direction of the columnar crystals, and a porosity at the columnar section side of the non-columnar section is higher than a porosity at the support side of the non-columnar section.