Flat Panel Detector Phosphor Void Gradient
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Solution Overview
Problem
Existing flat panel detectors for radiographic imaging face challenges in achieving high emission efficiency and image quality while maintaining structural integrity against shocks, as increasing scintillator layer thickness or void fraction to enhance sharpness can lead to image defects and fragility.
Innovation Solution
A flat panel detector design featuring a scintillator panel with a phosphor layer having a varying void fraction between the base and edge portions, coupled with a protective layer, which enhances impact resistance and luminance while maintaining sharpness, using cesium iodide activated with thallium and a support made of carbon, aluminum, or glass, and a resin layer for improved durability and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the scintillator layer thickness is increased to enhance sharpness, then image sharpness is improved, but the structure becomes more fragile and prone to shock damage
Solution Approach 1:
The patent applies local quality by varying the void fraction differentially across the phosphor layer - the base portion has a different void fraction than the edge portion. This allows optimization of both sharpness (through controlled light scattering in the base) and mechanical strength (through reinforced edge structures), resolving the contradiction between image quality and structural integrity.
Solution Approach 2:
The patent changes the void fraction parameter spatially within the phosphor layer, creating a gradient from the base portion to the edge portion. This parameter variation enables the layer to simultaneously achieve high sharpness through optimized light guidance while maintaining sufficient mechanical strength through controlled porosity distribution.
2Manufacturing precision
If the void fraction is increased to enhance sharpness, then image sharpness is improved, but emission efficiency decreases
Solution Approach 1:
The patent applies local quality by varying the void fraction differentially across the phosphor layer - the base portion has a different void fraction than the edge portion. This allows optimization of both sharpness (through controlled light scattering in the base) and mechanical strength (through reinforced edge structures), resolving the contradiction between image quality and structural integrity.
Solution Approach 2:
The patent changes the void fraction parameter spatially within the phosphor layer, creating a gradient from the base portion to the edge portion. This parameter variation enables the layer to simultaneously achieve high sharpness through optimized light guidance while maintaining sufficient mechanical strength through controlled porosity distribution.
3Use of energy by moving object
If the phosphor layer thickness is increased to enhance emission efficiency, then emission efficiency is improved, but light scattering increases and sharpness deteriorates
Solution Approach 1:
The patent applies local quality by varying the void fraction differentially across the phosphor layer - the base portion has a different void fraction than the edge portion. This allows optimization of both sharpness (through controlled light scattering in the base) and mechanical strength (through reinforced edge structures), resolving the contradiction between image quality and structural integrity.
Solution Approach 2:
The patent introduces a spatial dimension variation in the void fraction distribution within the phosphor layer. Instead of uniform void fraction, the structure transitions from base to edge portions, enabling simultaneous optimization of light extraction efficiency and image sharpness through multi-dimensional control of material properties.
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 provides a flat panel detector with enhanced physical resistance to shocks, improved sharpness, and emission efficiency, ensuring robustness and high-quality imaging without image defects, even under impact conditions.
Implementation Method 1
To convert radiation to visible light is employed a scintillator panel made of an X-ray phosphor which is emissive for radiation
Implementation Method 2
cesium iodide (CsI) exhibits enhanced conversion efficiency of X-rays to visible light and can easily form a phosphor of a columnar crystal structure through vapor deposition, whereby scattering of emitted light within a crystal is inhibited through a light guide effect
Implementation Method 3
a mixture of CsI and thallium iodide (TlI) at an appropriate ratio is deposited on a support in the form of a thallium activated cesium iodide (CsI:Tl) through vapor deposition
Data Source
AI summary
A flat panel radiation detector is disclosed, comprising a scintillator panel provided on a support with a phosphor layer comprising columnar crystals and a protective layer sequentially in this order, and the scintillator panel being coupled with a planar light receiving element having plural picture elements which are arranged two-dimensionally, in which the difference between to average void fraction of an edge portion of the phosphor layer and the average void fraction of a base portion is not less than 5% and not more than 25%, and the void fraction decreases from the base portion to the edge portion. There is provided a flat panel radiation detector with a phosphor layer which exhibits enhanced physical resistance to shock and is superior in sharpness and emission efficiency.