Scintillator Panel Non-Columnar Base Layer Adhesion
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Solution Overview
Problem
In radiological image detection apparatuses, the adhesion of phosphors to the support is compromised due to thermal expansion differences, leading to potential peeling and reduced sensitivity, especially when X-rays are irradiated from the photodetector side, and the use of columnar crystals alone may not provide adequate reflection and adhesion.
Innovation Solution
A scintillator panel with a phosphor structure that includes both columnar and non-columnar sections, where the non-columnar section has a lower porosity than the columnar section and is positioned opposite to the photodetector, enhancing adhesion and reflection by interposing a phosphor layer with high coverage between the columnar crystals and the support, formed using a vapor deposition method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the thickness of the crystal phase of the scintillator is increased to improve sensitivity, then sensitivity is improved, but light may be attenuated or dispersed when passing through the scintillator, causing blurring of the image
Solution Approach 1:
The phosphor layer is segmented into columnar crystal sections that act as independent light-guiding channels. Each columnar crystal directs light from its corresponding X-ray absorption region to the photodetector, preventing light dispersion while maintaining sufficient thickness for sensitivity.
Solution Approach 2:
A resin layer is introduced as an intermediary substance between the columnar crystal phosphor and the photodetector. This resin layer fills the gaps between crystals and provides optical coupling, ensuring efficient light transmission while maintaining the structural integrity needed for image sharpness.
2Manufacturing precision
If columnar crystals are used to guide light and improve image sharpness, then image sharpness is improved, but adhesion between the phosphor and support deteriorates due to thermal expansion differences
Solution Approach 1:
The phosphor structure is designed with different local qualities: columnar crystals in the upper portion for light guiding and image sharpness, and a non-columnar, more adherent structure in the lower portion for bonding to the support. This local differentiation resolves the adhesion problem while maintaining image quality.
Solution Approach 2:
The phosphor layer is constructed as a composite structure combining columnar crystals (for light guidance) with a non-columnar base layer (for adhesion). This composite approach allows each layer to perform its specific function optimally without compromising the other.
3Adaptability or versatility
If a control unit is provided at the scintillator side to control photodetector driving, then functionality is improved, but thermal influence on the scintillator increases, causing flexing and peeling
Solution Approach 1:
A resin layer is introduced as a thermal buffer between the control unit and the scintillator phosphor. This intermediary layer reduces direct thermal coupling, protecting the phosphor from thermal expansion-induced flexing and peeling while allowing the control unit to maintain its functionality.
4Reliability
If the coverage rate of the support by phosphor is increased to enhance adhesion, then adhesion is improved, but light reflection capability is reduced
Solution Approach 1:
The phosphor coverage is segmented: the non-columnar base layer provides full coverage for adhesion, while the columnar crystal structure in the upper layer creates light-reflecting interfaces. This segmentation allows both adhesion and light reflection to coexist without compromising either function.
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 improves the adhesion of the phosphor to the support, maintains image sharpness, and enhances the luminescence efficiency, preventing peeling and damage from thermal and mechanical stresses, while allowing for high sensitivity and definition in radiological imaging.
Implementation Method 1
a phosphor that is formed on a support and emits fluorescence by the irradiation of radiation
Implementation Method 2
an aggregate of columnar crystals that guide light emitted from a phosphor
Implementation Method 3
formed using a vapor deposition method
Data Source
AI summary
The X-ray image detection apparatus 1 includes: a scintillator panel 10 including a phosphor 200 that is formed on a support 101 and emits fluorescence by irradiation of radiation; and a photodetector 40 that detects the fluorescence emitted by the phosphor as an electric signal, wherein the phosphor 200 includes a columnar section 20 formed by growing crystals of a fluorescent material in a columnar shape, and a non-columnar section 25 provided between the columnar section 20 and the support 101 and has a porosity lower than that of the columnar section 20, and the scintillator panel 10 is disposed at the rear side of the photodetector 40 in a radiation travelling direction, and in the phosphor 200, the non-columnar section 25 is disposed at a side opposite to the photodetector side.