Scintillator Array Reflective Layer Layout for Dimensional Precision
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Solution Overview
Problem
The accuracy of dimension in scintillator arrays used in X-ray detectors affects the alignment with photodiodes, impacting the resolution and image quality of X-ray CT devices, particularly as the size of scintillator segments decreases.
Innovation Solution
A scintillator array with integrated first and second reflective layers, where the second reflective layer has a deformation of 20 µm or less at its corners, is used to enhance alignment accuracy and reduce dimensional variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scintillator segments are downsized to increase the number of channels, then the resolution of X-ray CT device is enhanced, but the accuracy of dimension of the scintillator array deteriorates
Solution Approach 1:
The scintillator array is divided into multiple scintillator segments corresponding to individual detection elements. Each segment is processed separately through cutting or grooving from a sintered body, allowing independent dimensional control while maintaining overall array precision. This segmentation enables downsizing of individual segments to increase channel density while managing cumulative dimensional accuracy through systematic processing.
Solution Approach 2:
A reflective layer is formed between scintillator segments before final assembly and bonding to photodiodes. This preliminary reflective layer formation establishes a reference surface that maintains dimensional accuracy throughout the manufacturing process. The reflective layer is formed at a stage when segments are still relatively stable, preventing subsequent dimensional drift that would affect alignment with photodiodes.
2Area of stationary object
If the area of the scintillator array is increased to increase the detection area, then the detection capability is improved, but the accuracy of dimension becomes more difficult to maintain
Solution Approach 1:
Large-area scintillator arrays are constructed by combining multiple scintillator segments processed from a single sintered body. The systematic cutting and grooving process ensures that each segment maintains precise dimensions even as the total array area increases. This modular approach allows scaling of detection area while preserving dimensional accuracy through controlled segmentation.
Solution Approach 2:
The reflective layer is formed as a preliminary step before final assembly, establishing a stable reference surface across the entire array. This early formation of the reflective layer structure prevents subsequent dimensional variations during assembly and bonding operations, maintaining accuracy even in large-area configurations.
3Stability of the object's composition
If reflective layer is formed to integrate scintillator segments, then the structural integrity is improved, but the deformation at corners increases
Solution Approach 1:
The reflective layer is formed with different characteristics at different locations. At corner regions where deformation occurs, the reflective layer is designed with specific properties (such as adjusted thickness or material composition) to compensate for corner deformation while maintaining integration. This local differentiation allows the reflective layer to serve both as a structural integrator and as a dimensional compensation mechanism.
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 design improves the resolution and image accuracy of X-ray detectors by minimizing deformation and maintaining dimensional precision, enhancing diagnostic capabilities and non-destructive inspection accuracy.
Implementation Method 1
X-rays incident upon the scintillator segments are converted into visible light
Implementation Method 2
a first reflective layer interposed between adjacent scintillator segments so as to be integrated with the scintillator segments, and a second reflective layer located alongside the surfaces of the scintillator segments on which X-rays are incident
Data Source
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AI summary
A decrease and variations in dimensional accuracy due to deformation is suppressed. The scintillator array according to an embodiment includes a plurality of scintillator segments each including a sintered body of a rare earth oxysulfide phosphor, a first reflective layer interposed between adjacent scintillator segments so as to integrate the scintillator segments, and a second reflective layer located on a surface side of the scintillator segments on which X-rays are incident. The amount of deformation of the corners of the second reflective layer is 20 µm or smaller.