PET Detector Cooling with Parallel Units for Timing Accuracy
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Solution Overview
Problem
Conventional cooling systems in PET imaging systems are inadequate for achieving the low temperatures needed to improve the noise performance of photodetector arrays, leading to temperature variations and limited timing accuracy in gamma quant detection.
Innovation Solution
A PET imaging system with parallel cooling units for individual detector modules, using a cooling fluid to thermally couple to photodetector arrays, minimizing temperature variations and enhancing timing resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional cooling systems are used to cool photodetector arrays, then some cooling effect is achieved, but temperature variations and gradients occur leading to limited timing accuracy
Solution Approach 1:
The cooling system is divided into multiple independent cooling units, each dedicated to a specific detector module. This segmentation allows each unit to independently control the temperature of its associated photodetector array, eliminating temperature variations between different regions and improving timing accuracy across the entire PET imaging system.
Solution Approach 2:
Each cooling unit is specifically designed to cool a particular detector module with localized cooling channels and heat transfer surfaces. This local quality approach ensures that each photodetector array receives optimized cooling tailored to its specific thermal characteristics and operational requirements, maintaining uniform temperature distribution and improving timing resolution.
2Measurement precision
If cooling temperature is reduced to improve noise performance, then timing resolution improves, but condensation risks increase
Solution Approach 1:
The cooling units use cooling fluid as an intermediary medium to transfer heat away from the photodetector arrays. By controlling the cooling fluid temperature and flow rate, the system can maintain photodetector arrays at optimal low temperatures for noise reduction while preventing the cooling surfaces from becoming cold enough to cause condensation of moisture in the surrounding environment.
Solution Approach 2:
The cooling system incorporates temperature sensors and control mechanisms that continuously monitor the temperature of photodetector arrays and adjust cooling parameters accordingly. This feedback control ensures that the cooling temperature is maintained at the optimal level for timing resolution while automatically preventing excessive cooling that would lead to condensation, thus protecting the system from moisture-related damage.
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 timing resolution and uniform temperature distribution across photodetector arrays, enhancing PET imaging performance by reducing temperature gradients and condensation risks.
Implementation Method 1
The heat transfer region of each cooling unit is thermally coupled to the photodetector array of the corresponding detector module for cooling the photodetector array
Data Source
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AI summary
A positron emission tomography, PET, imaging system (100) includes a plurality ofdetector modules (1301..i). Each detector module (1301..i) includes a cooling unit (130c1..i) with a heattransfer region (170). The heat transfer region (170) of each cooling unit (130c1..i) is thermallycoupled to a photodetector array (130b1..i) of the corresponding detector module for cooling thephotodetector array. The cooling units are configured to be fluidically coupled in parallel to at leastone cooling fluid source.