PET Detector Module Arrangement for Uniform Time Resolution
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Solution Overview
Problem
The randomness of detector module arrangement in PET apparatus leads to nonuniform time resolution in the Field of View (FOV), complicating image reconstitution and reducing image quality.
Innovation Solution
A method of arranging detector modules in a PET apparatus based on their performance characteristics, pairing modules with opposing ranks to minimize time resolution differences, and optimizing their positions to achieve uniform time resolution across the FOV, while considering Line-of-Responses and coupling high-time-resolution modules with low-time-resolution reading electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If detector modules are randomly arranged in the PET apparatus, then the arrangement is simple and easy to implement, but the time resolution becomes nonuniform across the Field of View
Solution Approach 1:
The patent applies local quality by assigning different positions to detector modules based on their individual time resolution characteristics. Modules with better time resolution are strategically placed in positions where they can most effectively contribute to uniform FOV performance, while modules with poorer resolution are positioned accordingly. This creates a non-uniform arrangement that compensates for individual module variations, achieving overall uniformity in the Field of View.
Solution Approach 2:
The patent changes the arrangement parameter from random to optimized positioning based on measured time resolution parameters. By measuring and comparing the time resolution parameters of individual detector modules, the system determines optimal positions for each module, transforming the arrangement from a simple random configuration to a parameter-based optimized configuration that achieves uniform FOV performance.
2Manufacturing precision
If detector modules are arranged to remove nonuniformity in time resolution, then the uniformity of performance improves, but the image reconstitution becomes more complicated
Solution Approach 1:
The patent applies preliminary action by performing time resolution measurements and position optimization during the setup and calibration phase, before actual imaging begins. The detector modules are measured, ranked, and positioned in their optimal locations in advance. This preliminary arrangement optimization eliminates the need for complex real-time corrections during image reconstitution, as the uniformity is already built into the physical arrangement.
3Manufacturing precision
If detector modules are arranged based on performance characteristics, then the uniformity of time resolution improves, but the arrangement determination becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the detector module set into groups or pairs based on their time resolution characteristics. Modules are measured individually, ranked according to performance, and then systematically arranged in positions that balance the overall FOV uniformity. This segmented approach to arrangement determination breaks down the complex optimization problem into manageable steps of measurement, ranking, and positional assignment.
Data Source
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AI summary
Improvement of uniformity in performance of the PET apparatus is provided. A method of determining arrangement, in a gamma ray detector, of a plurality of detector modules configured to convert light generating in response to an incident gamma ray generating due to a pair annihilation event into an electric signal. Performance information of each of the plurality of detector modules is obtained. Relative positions of the plurality of detector modules in the gamma ray detector are determined based on the obtained performance information.