Open Reflective Insert for Scintillator Crystal Assembly
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Solution Overview
Problem
Current PET scanner technologies face challenges in achieving optimal spatial resolution due to limitations in crystal size, light sharing, and complex assembly processes, which hinder the detection of small lesions and tumor identification.
Innovation Solution
The introduction of a scintillator crystal assembly with an open reflective insert, featuring a crystal array and a photosensor, where the open reflective insert is positioned between adjacent rows of crystals to control light sharing and simplify assembly, using varying post widths and configurations to enhance light transmission and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If smaller crystal size is used to improve spatial resolution, then spatial resolution is improved, but light sharing control becomes more difficult and assembly complexity increases
Solution Approach 1:
The reflective insert is divided into multiple segments corresponding to individual crystals or crystal groups. Each segment can be independently positioned and adjusted, allowing precise control of light sharing between adjacent crystals while maintaining modular assembly that reduces overall complexity
Solution Approach 2:
The reflective insert acts as an intermediary element positioned between adjacent crystals to control light sharing. This mediator component enables precise optical isolation between crystals without requiring direct modification of the crystals themselves, simplifying the overall assembly process
2Measurement precision
If smaller crystal size is used to improve spatial resolution, then spatial resolution is improved, but light output from crystals decreases
Solution Approach 1:
The reflective insert provides localized optical enhancement at each crystal boundary. By placing reflective material specifically at the interfaces between crystals, light that would otherwise be lost at boundaries is redirected back into the crystals, compensating for the reduced light output of smaller crystals while maintaining their spatial resolution advantages
3Measurement precision
If complex light sharing control is implemented to improve crystal separation, then spatial resolution is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The reflective insert serves multiple functions simultaneously: it controls light sharing between crystals, provides mechanical positioning references, and simplifies assembly procedures. This multi-functional component achieves crystal separation without requiring multiple separate complex systems, reducing manufacturing cost
Solution Approach 2:
The reflective insert is designed to self-align with crystal arrays through geometric features that automatically position the reflective segments in correct orientations. This self-aligning capability eliminates the need for complex alignment procedures and specialized assembly tools, reducing both manufacturing cost and assembly complexity
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 light control and separation between crystals, leading to enhanced spatial resolution and timing resolution, while simplifying the assembly process and reducing costs by minimizing the number of parts and complexity.
Implementation Method 1
The open reflective insert includes at least one reflective portion and at least one opening
Implementation Method 2
The scintillator crystals receive the annihilation photons and generate photons in response to the annihilation photons
Implementation Method 3
a photosensor configured to convert the light energy from the photons to electrical energy used to reconstruct an image
Data Source
AI summary
A scintillator crystal assembly includes a crystal array and an open reflective insert. The crystal array is configured to receive rays emitted by an object to be imaged and to emit light energy responsive to the received rays. The crystal array comprising plural crystals arranged in rows. Each crystal includes a reception surface configured to receive the rays emitted by the object to be imaged, an emission surface configured to emit the light energy responsive to the received rays, and plural sides extending from the emission surface that are aligned with sides of adjacent crystals in the crystal array. The open reflective insert is disposed between adjacent rows of the crystal array, and includes at least one reflective portion and at least one opening. The at least one reflective portion defines an area and the at least one opening is positioned within the area.