Segmented Light Guide Multiplexing for TOF PET Depth Encoding
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Solution Overview
Problem
Existing PET systems face challenges in achieving high spatial resolution due to increased data size and computational inefficiency, particularly with depth-encoding and time-of-flight readouts, which exacerbate the need for efficient signal multiplexing while maintaining depth-of-interaction and time resolution.
Innovation Solution
A particle detection system utilizing a segmented light guide with prismatoid segments for deterministic light sharing, allowing multiplexing of optical sensors and anodes/cathodes for energy and timestamp readouts, respectively, coupled with a processor to determine primary interaction and depth-of-interaction using machine learning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If n-to-1 scintillator modules-to-readout pixel coupling is used to improve spatial resolution, then spatial resolution is improved, but data size increases exponentially
Solution Approach 1:
The light guide is segmented into multiple sections, each coupled to a subset of optical sensors. This segmentation allows the system to process light signals from multiple scintillator modules through shared optical sensors, reducing the total number of readout channels needed while maintaining spatial resolution capabilities.
Solution Approach 2:
Each optical sensor is designed to receive light signals from multiple scintillator modules simultaneously through the segmented light guide structure. This multi-functionality allows a single optical sensor to serve multiple detection purposes, reducing the overall number of sensors and connections required in the system.
2Measurement precision
If depth-encoding is implemented to mitigate parallax error, then spatial resolution uniformity is improved, but the number of LORs increases exponentially
Solution Approach 1:
The light guide is divided into multiple depth-encoded segments along the axial direction. Each segment corresponds to a specific depth range, allowing the system to determine depth of interaction by identifying which segment detects the light signal. This segmentation provides depth encoding capability without requiring exponential increase in LORs.
Solution Approach 2:
Depth encoding is achieved by adding the axial dimension to the light guide structure, creating segmented sections along the depth direction. This dimensional approach allows depth information to be extracted from the spatial distribution of light signals across segments, avoiding the need for exponential LOR multiplication.
3Device complexity
If multiplexing of optical sensors is used to reduce data size, then computational complexity is reduced, but timing resolution may be impacted
Solution Approach 1:
The light guide is segmented into multiple sections that are coupled to different subsets of optical sensors. This segmentation ensures that timing-critical signals are routed to dedicated sensors with minimal multiplexing, while less time-sensitive energy information can be multiplexed. The segmented structure allows differential handling of timing and energy channels.
Solution Approach 2:
Different regions of the light guide are optimized for different functions: segments coupled to timing-sensitive optical sensors are designed for fast signal transmission, while other segments can be optimized for energy measurement with more aggressive multiplexing. This local optimization maintains timing resolution where needed while reducing computational complexity elsewhere.
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 system achieves improved energy and depth-of-interaction resolution with retained high timing resolution and reduced computational complexity, enabling efficient data processing and accurate event detection.
Implementation Method 1
Each prismatoid segment may be configured to redirect particles between scintillator modules in contact with the respective prismatoid segment
Implementation Method 2
The scintillator array may comprise a second plurality of scintillator modules
Data Source
AI summary
A multiplexing scheme for both energy and timing information is provided for a particle detection system having an optical sensor array with multiple optical sensors. Each optical sensor is associated with multiple scintillator modules. The system has a segmented prismatoid light guide comprising multiple prismatoid segments. Each segment is associated with multiple optical sensors, where the optical sensors are adjacent. One end each scintillator module is in contact with its associated optical sensor and the other is in contact with its associated segment. Multiple optical sensors may be connected to an energy readout channel, respectively, such that optical sensors associated with the same segments are not connected to the same energy readout channel. Each energy readout channel has at least two timestamps associated therewith.