Deposition Substrate Reflective Layer for Scintillator Sharpness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional scintillator panels face issues with sharpness deterioration due to light scattering at interfaces and irregularities in substrates, leading to suboptimal X-ray image quality and productivity challenges in manufacturing.
Innovation Solution
A deposition substrate with a reflective layer containing light-scattering particles and a binder resin with a specific glass transition temperature, allowing for excellent cuttability and preventing separation of the reflective layer during cutting, while enhancing the sharpness and sensitivity of radiographic images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the phosphor layer is increased to improve luminous efficiency, then the signal-to-noise ratio is enhanced, but light scattering increases and image sharpness deteriorates
Solution Approach 1:
A light-guiding layer is introduced as an intermediary between the phosphor layer and the substrate. This layer has a refractive index higher than both the phosphor layer and the substrate, creating a gradient that guides light vertically and reduces lateral scattering, thereby maintaining image sharpness while allowing increased phosphor thickness for improved luminous efficiency
Solution Approach 2:
The refractive index parameter is optimized by selecting materials with specific refractive index values. The light-guiding layer uses materials with refractive indices between 1.4 and 1.7, which is higher than the phosphor layer (1.3-1.4) and substrate (1.2-1.4), creating the necessary gradient for effective light guidance and reduced scattering
2Reliability
If a reflective layer is added to increase optical output, then luminous efficiency improves, but light scattering at the interface deteriorates image sharpness
Solution Approach 1:
The light-guiding layer serves as a mediator between the phosphor layer and the reflective layer, preventing direct interface contact that causes light scattering. By positioning the reflective layer beneath the light-guiding layer, the system maintains optical output enhancement while eliminating interface-related sharpness deterioration
Solution Approach 2:
Instead of adding the reflective layer directly at the phosphor-substrate interface (2D plane), the solution introduces a third dimension by inserting the light-guiding layer in between, creating a layered structure that separates the phosphor layer from the reflective layer and eliminates interface scattering problems
3Manufacturing precision
If irregularities in the substrate are reduced to improve image sharpness, then manufacturing complexity increases, but productivity decreases
Solution Approach 1:
The light-guiding layer acts as a buffer that compensates for substrate irregularities. Even when the substrate has manufacturing variations, the light-guiding layer provides a smooth optical path, maintaining image sharpness without requiring ultra-precise substrate manufacturing, thus preserving productivity
Solution Approach 2:
The light-guiding layer is designed beforehand to compensate for potential substrate irregularities. By incorporating this layer with appropriate thickness and refractive index properties, the system pre-cushions against manufacturing variations, ensuring consistent image quality without increasing substrate manufacturing complexity
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 solution enables scintillator panels to produce radiographic images with improved sharpness and sensitivity by aligning crystal heights and ensuring uniform contact with planar light-receiving elements, addressing the limitations of conventional substrates.
Implementation Method 1
a binder resin with a specific glass transition temperature (Tg), allowing for excellent cuttability and preventing separation of the reflective layer during cutting
Implementation Method 2
the reflective layer includes light-scattering particles and a binder resin
Implementation Method 3
a scintillator layer made of an X-ray phosphor that, when illuminated with X-rays, convert the radiations into visible light that is emitted
Implementation Method 4
convert the radiations into visible light that is emitted
Implementation Method 5
deposition substrates and scintillator panels used in the formation of radiographic images
Data Source
AI summary
An object of the invention is to provide a scintillator panel which exhibits excellent cuttability and can be cut without the occurrence of problems such as the separation of a scintillator layer and which can give radiographic images such as X-ray images with excellent sensitivity and sharpness. The scintillator panel of the invention includes a reflective layer and a scintillator layer formed by deposition on a support, and the reflective layer includes light-scattering particles and a specific binder resin and has a specific thickness.