Radiation detector, and radiation detector manufacturing method
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Solution Overview
Problem
Existing radiation detectors face a trade-off between increasing the area of the radiation detection region and achieving high-resolution radiological images, as forming a scintillator panel with granular phosphor enhances detection area but reduces resolution, while using columnar crystals improves resolution but limits area expansion.
Innovation Solution
A radiation detector design featuring two scintillator panels with columnar crystals adjacent to a sensor panel, each attached by an adhesive layer, where the scintillator layers extend to overlap, allowing for increased detection area and resolution without exposing the adhesive, and incorporating flexible substrates for improved workability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a scintillator layer is formed of granular phosphor to increase the area of the scintillator panel, then the area of the radiation detection region is increased, but the resolution of the radiological image deteriorates
Solution Approach 1:
The scintillator panel is divided into multiple smaller scintillator panels (first scintillator panel, second scintillator panel, etc.) arranged in a matrix. Each small scintillator panel maintains columnar crystal structure for high resolution, while the collective arrangement achieves large detection area. The adhesive layers are also segmented to correspond with each small scintillator panel, enabling precise positioning and assembly.
2Measurement precision
If a scintillator layer is formed of columnar crystals to achieve high-resolution radiological image, then the resolution is improved, but the area of the scintillator panel is difficult to be increased
Solution Approach 1:
The large-area scintillator panel is segmented into multiple small scintillator panels, each maintaining the columnar crystal structure necessary for high resolution. By arranging these small panels in a matrix pattern and using separated adhesive layers for precise positioning, the system achieves both high resolution (from columnar crystals in each small panel) and large detection area (from the collective arrangement of multiple panels).
3Area of stationary object
If multiple scintillator panels are attached with adhesive layer to increase detection area, then the area is increased, but foreign matter may be caught between the light receiving surface and scintillator panel during attachment
Solution Approach 1:
The adhesive layer is segmented into multiple separate adhesive layers, each corresponding to a specific small scintillator panel. This segmentation allows each adhesive layer to be independently applied and controlled, reducing the risk of foreign matter contamination during the attachment process while still enabling the assembly of multiple large-area scintillator panels.
4Ease of manufacture
If adhesive layer is exposed outside during attachment of scintillator panels, then attachment can be performed, but the time for exposing the adhesive layer increases and foreign matter may be caught
Solution Approach 1:
The adhesive layer is segmented into multiple separate adhesive layers, each corresponding to a specific small scintillator panel. This segmentation enables parallel processing and reduces the overall exposure time, as each adhesive layer can be applied and positioned independently without requiring the entire assembly to be exposed simultaneously.
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 design achieves both an enlarged radiation detection region and enhanced image resolution while minimizing adhesive exposure time and foreign matter interference, with flexible substrates facilitating accurate attachment and protection of columnar crystals.
Implementation Method 1
a first scintillator panel and a second scintillator panel disposed on the light receiving surface in a state of being adjacent to each other
Data Source
AI summary
A radiation detector includes a sensor panel having a light receiving surface, a first scintillator panel and a second scintillator panel disposed on the light receiving surface in a state of being adjacent to each other along the light receiving surface, and an adhesive layer. The first scintillator panel has a first substrate and a first scintillator layer including a plurality of columnar crystals. The second scintillator panel has a second substrate and a second scintillator layer including a plurality of columnar crystals. The first scintillator layer reaches at least a first portion of the first substrate. The second scintillator layer reaches at least a second portion of the second substrate. The adhesive layer is separated for each of the first scintillator panel and the second scintillator panel.