Modular PET Detector Arrays for Gamma-Ray Localization
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Solution Overview
Problem
Current positron emission tomography (PET) detectors face challenges in accurately localizing gamma rays due to limitations in detector design and light spreading, leading to inefficiencies in position sensing and energy resolution, particularly in thicker scintillator layers.
Innovation Solution
The design incorporates modular one-dimensional arrays of monolithic detector sub-modules with scintillator, light-spreading, and photodetector layers, featuring a two-dimensional array of photodetectors arranged in columns and rows, and common printed circuit boards for improved signal processing and position determination, allowing for precise localization of gamma rays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thicker scintillator layers are used to improve gamma-ray detection efficiency, then detection efficiency is improved, but position sensing accuracy deteriorates due to increased light spreading
Solution Approach 1:
The detector is divided into multiple independent photodetector elements arranged in a two-dimensional array, with each element independently measuring light intensity. This segmentation allows precise position determination by comparing signals from multiple discrete elements, counteracting the blurring effect of light spreading in thicker scintillators.
Solution Approach 2:
The patent implements position-dependent signal processing where each photodetector element's output is weighted and processed according to its specific location in the array. This local quality approach enables accurate position sensing by analyzing the spatial distribution of light across different detector elements, compensating for light spreading in thicker scintillator layers.
2Ease of manufacture
If conventional detector designs are used, then manufacturing is simpler, but position sensing accuracy and energy resolution deteriorate
Solution Approach 1:
The patent transitions from conventional one-dimensional or point detectors to a two-dimensional array of photodetector elements. This dimensional expansion enables simultaneous measurement of light intensity across multiple spatial positions, dramatically improving position sensing accuracy while maintaining compatibility with standard manufacturing techniques for arrayed photodetectors.
3Device complexity
If conventional signal processing is used, then device complexity is lower, but timing and energy resolution deteriorate
Solution Approach 1:
The patent uses multiple photodetector elements that create redundant copies of the light signal from different spatial positions. By comparing these copied signals across the array, the system can precisely determine position, time, and energy through signal correlation and ratio calculations, achieving high resolution without requiring complex single-element 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 configuration enhances the accuracy of gamma-ray localization, improves timing and energy resolution, and enables the use of thicker scintillator layers while reducing edge effects and manufacturing costs.
Implementation Method 1
Each monolithic detector sub-module comprises a scintillator layer
Implementation Method 2
a light-spreading layer mounted on the scintillator layer
Implementation Method 3
a photodetector layer mounted on the light-spreading layer, the photodetector layer comprising a two-dimensional array of photodetectors
Data Source
AI summary
A gamma-ray detector includes a plurality of modular one-dimensional arrays of monolithic detector sub-modules. Each monolithic detector sub-module includes a scintillator layer, a light-spreading layer, and a photodetector layer. The photodetector layer comprises a two-dimensional array of photodetectors that are arranged in columns and rows. A common printed circuit board is electrically coupled to the two-dimensional array of photodetectors of the plurality of modular one-dimensional arrays of monolithic detector sub-modules of a corresponding modular one-dimensional array. The two-dimensional array of photodetectors can be electrically coupled in a split-row configuration or in a checkerboard configuration. The two-dimensional array of photodetectors can also have a differential readout.