Light Guide Assembly Alignment for Radiation Detectors
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Solution Overview
Problem
The challenge in manufacturing and assembling light guides for radiation detectors, such as those used in PET systems, lies in handling and mounting a large number of individual frustum-shaped light guides, which can lead to alignment issues and potential damage, compromising scintillation count rates and image quality.
Innovation Solution
A method involving the fabrication of a light guide assembly with an array of frustum-shaped light guides and an optical isolation frame, where the frame's slats match the gaps between the light guides and the periphery, bonded together to provide alignment and stability, potentially using injection over-molding, adhesive, mechanical interlocking, or ultrasonic welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If individual light guides are handled and mounted separately, then flexibility in assembly is improved, but alignment precision and risk of damage increase
Solution Approach 1:
Multiple individual light guides are merged into a single integrated light guide assembly with a common base plate. This combining approach maintains assembly flexibility while eliminating alignment issues between separate components, as the light guides are pre-aligned and fixed relative to each other on the shared base plate.
Solution Approach 2:
The light guides are pre-aligned and pre-mounted on the base plate during manufacturing, before final assembly with the detector system. This preliminary positioning ensures precise alignment is achieved during production rather than during field assembly, reducing the risk of misalignment while maintaining operational flexibility.
2Adaptability or versatility
If individual light guides are handled repeatedly during assembly, then adaptability in mounting is improved, but reliability and risk of damage worsen
Solution Approach 1:
The light guides are combined into a single integrated assembly that is mounted as one unit rather than handling multiple separate pieces. This reduces the number of handling operations from twelve individual mounts to a single assembly mount, thereby improving reliability and reducing damage risk while maintaining mounting adaptability through the modular base plate design.
3Ease of manufacture
If multiple individual light guides are assembled separately, then ease of manufacturing is improved, but device complexity and alignment difficulty increase
Solution Approach 1:
The light guide system is segmented into a modular base plate with integrated light guides that can be manufactured separately and then assembled as a complete unit. This segmentation allows the base plate with light guides to be manufactured using standardized processes, reducing overall device complexity while maintaining manufacturing simplicity through modular construction.
Data Source
AI summary
A method of fabricating a light guide assembly includes the steps of providing an array of generally frustum-shaped light guides made of a light-transmissive material, providing an optical isolation frame of interconnected slats made of an opaque material, wherein the slats are arranged and profiled to correspondingly match the gaps between the light guides and the outer gap around the periphery of the light guide array, and bonding the light guide array and the optical isolation frame to each other.