Radiation Imaging Panel Scintillator Resin Layer Optimization
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Solution Overview
Problem
The concentration and thickness of fine light reflecting particles in the phosphor protecting layer of radiation imaging panels need optimization to improve Modulation Transfer Function (MTF) without compromising moisture prevention, as low concentrations result in insufficient light reflection and high concentrations lead to light diffusion, while excessive thickness affects MTF and moisture prevention.
Innovation Solution
A radiation imaging panel with a scintillator plate featuring a resin layer containing metal oxide particles dispersed in a hot melt resin, which serves as both a light reflecting and moisture preventing layer, optimizing the concentration and thickness of these particles to enhance MTF while maintaining effective moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the concentration of fine light reflecting particles is increased to improve light reflection effect, then the light reflecting function is enhanced, but light diffusion increases and MTF improving effect becomes insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration of fine light reflecting particles within the range of 0.03 vol% to 0.3 vol%. This optimized concentration range ensures sufficient light reflection to improve MTF while preventing excessive light diffusion that would occur at higher concentrations. The specific parameter control resolves the contradiction between enhancing light reflection and maintaining image quality.
Solution Approach 2:
The patent employs local quality by dispersing fine light reflecting particles non-uniformly within the phosphor protecting layer, with higher concentration near the scintillator interface and lower concentration toward the outer surface. This localized distribution maximizes light reflection where most needed (at the scintillator boundary) while minimizing light diffusion in regions where it would degrade image quality.
2Reliability
If the thickness of the phosphor protecting layer is increased to improve moisture prevention, then the moisture preventing function is enhanced, but light diffusion increases and MTF improving effect becomes insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the phosphor protecting layer to be within 1 μm to 10 μm. This controlled thickness range provides sufficient moisture protection while limiting the path length for light propagation, thereby reducing light diffusion and maintaining MTF improvement. The precise thickness control resolves the contradiction between moisture prevention and light quality.
Solution Approach 2:
The patent uses composite materials by combining the phosphor protecting layer containing fine light reflecting particles with a separate moisture-proof coating layer. This composite structure allows the phosphor protecting layer to focus on light reflection with minimal thickness (1-10 μm) while the moisture-proof coating provides the necessary moisture barrier, thus avoiding light diffusion issues that would occur with a thicker single layer.
3Manufacturing precision
If the concentration of fine light reflecting particles is decreased to reduce light diffusion, then MTF is improved, but the light reflecting effect becomes insufficient
Solution Approach 1:
The patent employs local quality by concentrating fine light reflecting particles primarily at the interface between the scintillator and the phosphor protecting layer, with a gradient distribution extending into the protecting layer. This localized concentration ensures strong light reflection at the critical interface to improve MTF, while the decreasing concentration toward the surface minimizes light diffusion. The local quality approach resolves the contradiction between light reflection effectiveness and light diffusion control.
4Reliability
If a separate moisture-proof coating is added to protect the scintillator, then moisture prevention is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by integrating multiple functions into the phosphor protecting layer: light reflection (through dispersed fine light reflecting particles), mechanical protection, and partial moisture barrier. By combining these functions in a single layer rather than using separate layers for each function, the patent reduces device complexity while maintaining effective moisture prevention and light reflection performance.
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
The optimized concentration and thickness of metal oxide particles in the resin layer improve the Modulation Transfer Function (MTF) and Detective Quantum Efficiency (DQE) of the radiation imaging panel, ensuring efficient light reflection and moisture prevention.
Implementation Method 1
a reflection layer having a light reflecting function can be arranged over the side of the scintillator, which is opposite to the photoelectric conversion element, so that the photoelectric conversion element can efficiently detect the light converted from the radiation by the scintillator
Implementation Method 2
Since the alkali metal halide deteriorates due to moisture absorption, a protective layer having a moisture preventing function can be arranged over the scintillator
Implementation Method 3
an indirect conversion type FPD that converts a radiation having passed through an object into light by using a scintillator
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A radiation imaging panel (100) is provided. The radiation imaging panel (100) comprises a substrate (101) on which a plurality of pixels each including a photoelectric conversion element are arranged, a scintillator (108) arranged over the substrate (101), and a protective layer (110) arranged so as to cover the scintillator (108). The scintillator (108) includes a plurality of columnar crystals (102) containing an alkali metal halide. The protective layer (110) includes a resin layer (104) containing a resin (103) to which particles (106) of a metal oxide are added. A thickness of the resin layer (104) from an apex of each of the plurality of columnar crystals (102) to an upper surface of the resin layer (104) is not less than 10 µm and less than 30 µm, and a concentration of the particles (106) in the resin layer (104) is not less than 0.15 vol% and less than 7.5 vol%.