Segmented PET Detector Module for Light Collection and Timing Resolution
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Solution Overview
Problem
Current PET scanner designs face challenges in achieving optimal light collection and processing efficiency due to trade-offs between detector module size, optical isolation, and counting capacity, leading to limitations in spatial and timing resolution, as well as manufacturing and maintenance complexities.
Innovation Solution
A segmented detector module design with optically isolated sub-arrays and shared photosensors, where each sub-array is covered by a group of photosensors and connected through trigger zones to minimize light contamination and allow independent calibration and replacement, enhancing light collection and processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large array of photosensors is used to cover the entire crystal array, then light collection efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The crystal array is divided into multiple sub-arrays, with each sub-array covered by a dedicated group of photosensors. This segmentation allows the system to achieve high light collection efficiency for each sub-array while managing overall device complexity through modular design and independent processing channels.
2Ease of manufacture
If the detector module is designed as a single integrated unit, then manufacturing is simplified, but the ability to perform independent calibration and replacement of faulty components is reduced
Solution Approach 1:
The detector module is segmented into multiple independent sub-arrays, where each sub-array can be independently calibrated, tested, and replaced. This segmentation enables faulty components to be identified and replaced individually without requiring replacement of the entire detector module, while still allowing the module to function as an integrated unit during operation.
Solution Approach 2:
Each sub-array within the detector module is designed with uniform structural characteristics and can be independently calibrated. This local uniformity allows for simplified manufacturing of individual sub-arrays while enabling independent quality control and calibration of each segment, balancing manufacturing simplicity with repairability.
3Device complexity
If photosensors are shared between adjacent sub-arrays to reduce the total number of photosensors, then device complexity is reduced, but light contamination between sub-arrays increases
Solution Approach 1:
The system segments the crystal array into multiple sub-arrays, with each sub-array having its own dedicated photosensors. This segmentation prevents light contamination between sub-arrays by ensuring optical isolation, while the modular design allows for efficient use of photosensors within each sub-array group without requiring excessive redundancy.
4Device complexity
If the detector module processes signals from all sub-arrays simultaneously through a single channel, then device complexity is reduced, but processing speed and timing resolution deteriorate
Solution Approach 1:
The signal processing system is segmented into multiple independent processing channels, with each channel dedicated to processing signals from a specific sub-array. This segmentation enables parallel processing of signals from different sub-arrays, significantly improving processing speed and timing resolution compared to sequential processing through a single channel.
Solution Approach 2:
Multiple processing channels operate simultaneously and continuously to process signals from different sub-arrays without interruption. This continuous parallel processing maintains high processing speed and timing resolution by eliminating the sequential bottlenecks that would occur with single-channel processing.
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 design improves timing resolution, increases manufacturing efficiency, and reduces costs by allowing independent module testing and replacement, while maintaining high count rates and light collection efficiency.
Implementation Method 1
an array of scintillation crystal elements and a plurality of photosensors. The array of the scintillation crystal elements includes a plurality of substantially optically isolated sub-arrays
Implementation Method 2
The plurality of photosensors are arranged to cover the array of crystal elements and configured to receive light emitted from the array of crystal elements
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2
AI summary
A PET detector module (220) according to one embodiment includes an array (203) of scintillation crystal elements and a plurality of photosensors (201). The array (203) includes a plurality of substantially optically isolated sub-arrays (301, 302, 303). The photosensors (201) are arranged to cover the array (203) and configured to receive light emitted from the array (203). The sub-arrays (301, 302, 303) are optically isolated so that light emitted from an individual scintillation crystal located in a corresponding sub-array is concentrated so as to be primarily received only by those photosensors that cover the corresponding sub-array. At least one photosensor, which receives light emitted from crystals in a first sub-array, also receives light emitted from crystals in one and only one sub-array that is adjacent to the first sub-array.