Dual-Layer Scintillator Radiation Detector Design
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Solution Overview
Problem
Existing radiation detectors face challenges in achieving high-quality radiological images without increasing costs, particularly due to the limitations of thick scintillator layers which lead to image blurring and complex manufacturing processes.
Innovation Solution
A radiation detector design featuring a substrate with a first phosphor layer generating light and a second phosphor layer with different energy characteristics, where the second phosphor layer is laminated on the surface of the first phosphor layer not facing the substrate, allowing for improved light guidance and absorption, thereby enhancing image quality without the need for thick, costly columnar crystals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the scintillator layer is increased to increase the amount of radiation absorbed, then the radiation detection efficiency is improved, but the manufacturing cost increases and the image quality deteriorates due to blurring
Solution Approach 1:
The patent divides the scintillator layer into multiple distinct layers (first phosphor layer and second phosphor layer) with different functions. The first phosphor layer converts X-rays to visible light, while the second phosphor layer converts the visible light to ultraviolet light, allowing each layer to be optimized for its specific function rather than requiring a single thick layer
Solution Approach 2:
The patent introduces a new dimensional approach by adding a wavelength conversion layer (second phosphor layer) that converts light from one wavelength range to another. This allows the system to achieve enhanced radiation absorption without increasing the physical thickness of the scintillator layer, thereby maintaining image quality while improving detection efficiency
2Reliability
If the thickness of the scintillator layer is increased to increase the amount of radiation absorbed, then the radiation detection efficiency is improved, but the image quality deteriorates due to blurring
Solution Approach 1:
The patent segments the scintillator into multiple thin layers rather than using a single thick layer. This segmentation prevents light scattering and blurring that occurs in thick layers, while still achieving high radiation absorption through the cumulative effect of multiple optimized layers
Solution Approach 2:
The first phosphor layer acts as an intermediary that converts X-rays to visible light, which is then converted to ultraviolet light by the second phosphor layer. This intermediary conversion process allows for efficient radiation detection while maintaining sharp image quality by preventing direct light scattering in a thick layer
3Manufacturing precision
If the porosity in the initial portion of columnar crystals is increased to reduce fusion, then the image blurring is reduced, but the amount of emitted light is reduced
Solution Approach 1:
The patent addresses the light emission problem by introducing a second phosphor layer that converts visible light to ultraviolet light. This wavelength conversion adds a new dimension to the light output, compensating for the reduced visible light emission caused by increased porosity in the columnar crystals
Solution Approach 2:
The patent uses composite material structure with two different phosphor materials having different emission characteristics. The first phosphor layer emits visible light with reduced intensity due to porosity, while the second phosphor layer converts this to ultraviolet light, creating a composite light output that maintains image sharpness while compensating for light intensity loss
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 the resolution and quality of radiological images while reducing costs by utilizing a thinner first phosphor layer and effectively guiding light from the second phosphor layer, thus improving image sensitivity and reducing exposure.
Implementation Method 1
a first phosphor layer which is laminated on the other surface of the substrate, generates first light corresponding to a radiation emitted through the substrate
Implementation Method 2
a second phosphor layer which is laminated on a surface of the first phosphor layer not facing the substrate, generates second light corresponding to a radiation emitted through the first phosphor layer, and has different energy characteristics of absorbed radiations from the first phosphor layer
Implementation Method 3
a first photoelectric conversion element, which has one surface from which a radiation is emitted and the other surface from which light is emitted and which generates electric charges corresponding to the light
Data Source
AI summary
A radiation detector and a radiological image radiographing apparatus capable of improving the quality of an obtained radiological image without causing an additional cost are provided. A first scintillator configured to include columnar crystals generating first light corresponding to a radiation emitted through a TFT substrate is laminated on the other surface of the TFT substrate that has a first photoelectric conversion element, which has one surface from which a radiation is emitted and the other surface from which at least one of the first light and the second light is emitted and which generates electric charges corresponding to the light, and a first switching element. A second scintillator which generates second light corresponding to a radiation emitted through the first scintillator and has different energy characteristics of absorbed radiations from the first scintillator is laminated on a surface of the first scintillator not facing the TFT substrate.