Patterned Scintillator Panel Using Thermoplastic Composite
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Solution Overview
Problem
Existing scintillator screens face challenges in achieving mechanical and environmental robustness while maintaining high image quality, as materials like columnar thallium-doped CsI are fragile and costly to produce, and previous approaches like fiber and microwell technologies have failed to replicate their performance due to issues with particle loading, air pockets, and refractive index mismatch.
Innovation Solution
A patterned scintillator panel is created using an extruded or injection-molded scintillator layer composed of thermoplastic polyolefin and scintillator material, where the layer is patterned to enhance mechanical and environmental stability, avoiding air voids and refractive index mismatches by forming columnar structures without cavity filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If columnar thallium-doped CsI screens are used to achieve high spatial resolution, then image quality is improved, but mechanical fragility and environmental instability worsen
Solution Approach 1:
The patent changes the material parameters from fragile CsI:Tl to robust thermoplastic polyolefin composite, while maintaining the columnar structure geometry. This parameter change allows the material to achieve mechanical robustness and environmental stability while preserving the optical properties needed for high spatial resolution through total internal reflection
Solution Approach 2:
The patent uses composite materials consisting of thermoplastic polyolefin combined with scintillator particles (such as Gd2O2S:Tb). This composite approach allows the material to benefit from both the mechanical robustness of the thermoplastic matrix and the scintillation properties of the embedded particles, resolving the contradiction between durability and image quality
2Reliability
If micrawell technology is used to create patterned structures, then mechanical robustness is improved, but air pockets are introduced causing refractive index mismatch
Solution Approach 1:
Instead of creating micrawells and filling them with scintillator material (which introduces air pockets), the patent inverts the approach by embedding scintillator particles within a continuous thermoplastic matrix that is then patterned. This inversion eliminates air pockets and refractive index mismatches while maintaining mechanical robustness through the continuous matrix structure
Solution Approach 2:
The patent applies local quality by creating patterned regions in the thermoplastic composite material where scintillator particles are concentrated in specific geometries (columns, pixels, or other patterns). This allows the material to have different properties in different regions - high scintillation efficiency in the patterned areas and mechanical robustness in the thermoplastic matrix - resolving the contradiction between structural integrity and optical precision
3Measurement precision
If fiber assembly approach is used to create columnar structures, then total internal reflection is achieved, but particle loading and fiber extrusion challenges worsen
Solution Approach 1:
The patent merges the scintillator particles with the thermoplastic matrix into a homogeneous composite material before extrusion. This combining approach eliminates the separate steps of particle loading into fibers and subsequent assembly, as the particles are uniformly distributed in the matrix during compounding. The resulting composite can be directly extruded into patterned structures, resolving the manufacturing challenges while maintaining the columnar geometry needed for total internal reflection
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 results in scintillator panels with improved mechanical and environmental robustness, increased optical transparency, and enhanced spatial resolution, with intrinsic modulation transfer function (MTF) values surpassing those of solvent-coated screens and approaching the performance of CsI-based panels.
Implementation Method 1
columnar thallium-doped CsI screens provide an excellent combination of high scintillation efficiency and high x-ray absorptivity
Implementation Method 2
it is the concept of total internal reflection that enables columnar CsI scintillator screens to minimize the divergence of the optical radiation generated upon x-ray irradiation
Data Source
AI summary
A patterned scintillator panel including an extruded scintillator layer comprising a thermoplastic polyolefin and a scintillator material, wherein the scintillator layer comprises a pattern. Also disclosed is a method of making a patterned scintillator panel including forming a scintillator layer by melt extrusion, the scintillator layer comprising thermoplastic particles comprising a thermoplastic polyolefin and a scintillator material; and patterning the scintillator layer. Further disclosed is a method of making a patterned scintillator panel including forming a scintillator layer by injection molding, the scintillator layer comprising thermoplastic particles comprising a thermoplastic polyolefin and a scintillator material; and patterning the scintillator layer.