Scintillator Pixel DOI Detection via Alternating Optical Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing PET systems face limitations in spatial resolution due to two-dimensional measurement of gamma interactions, leading to parallax errors, and current methods for depth-of-interaction (DOI) information collection are costly and complex.
Innovation Solution
A system comprising a block of scintillator pixels with alternating optical coupling and separation patterns, coupled with sensors, generates DOI information by varying light distribution based on interaction height, enabling three-dimensional imaging without additional equipment or high costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional two-dimensional measurement is used for gamma interactions, then the device complexity is low, but the spatial resolution deteriorates due to parallax errors
Solution Approach 1:
The patent applies dimensionality change by transitioning from two-dimensional measurement to three-dimensional measurement of gamma interactions. The alternating optical coupling and separation patterns encode depth information (Z-axis) into the light distribution pattern, enabling DOI detection without adding complex mechanical structures. This resolves the contradiction by improving spatial resolution through dimensional enhancement while maintaining relatively simple device architecture.
Solution Approach 2:
The patent implements local quality by creating spatially varying optical coupling characteristics within the scintillator block. Different regions (alternating patterns) have different coupling strengths, which locally modulate light distribution based on interaction depth. This local variation in optical properties enables DOI encoding throughout the volume, improving measurement precision without requiring complex global system changes.
2Measurement precision
If phoswich detectors with stacked scintillators are used to reduce parallax errors, then the spatial resolution improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies segmentation by dividing the scintillator block into regions with alternating optical coupling and separation patterns. This segmentation creates distinct optical zones that encode depth information, achieving DOI capability similar to stacked scintillator approaches but within a single monolithic block, thereby simplifying manufacturing compared to assembling multiple scintillator layers.
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical coupling parameter (refractive index, coupling strength) in an alternating pattern throughout the scintillator block. This parameter modulation encodes depth information in the light distribution, achieving the same functional effect as multiple scintillator layers but with simpler manufacturing since it involves modifying optical properties rather than assembling multiple components.
3Use of energy by moving object
If alternating optical coupling and separation patterns are implemented, then the light collection efficiency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by implementing alternating regions of optical coupling and separation within the scintillator block. These local variations in optical properties create the DOI encoding pattern while maintaining overall manufacturing feasibility. The local quality approach allows standard manufacturing techniques to be used with moderate precision requirements, as the pattern can be achieved through conventional optical coupling methods applied in alternating zones.
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 approach enhances light collection efficiency and spatial resolution, reducing parallax errors and simplifying the manufacturing process, while allowing the use of the fastest scintillator material without additional layering, thus improving image quality and reducing system costs.
Implementation Method 1
a block of scintillator pixels with alternating optical coupling and separation patterns, coupled with sensors, generates DOI information by varying light distribution based on interaction height
Implementation Method 2
A first medium distributed in an alternating pattern of coupling and separation between each of the scintillator pixels in a first portion or second portion of the block
Data Source
AI summary
A system and method is provided for determining depth of interaction (DOI) information. The system and method includes a detector configured to generate DOI information as a result of radiation emitted from a radiation source. The system and method further includes a plurality of scintillator pixels forming a block, wherein the plurality of scintillator pixels have a first portion and a second portion. A first medium distributed in an alternating pattern of coupling and separation between each of the scintillator pixels in a first portion or second portion of the block is also provided. A plurality of sensors for detecting scintillation events across the plurality of scintillators based on the alternating pattern of coupling and separation between each of the scintillator pixels, wherein DOI information is provided by a position profile of the block, and an image processor for generating a 3 dimensional image from the DOI information are also included.