After-Pulse Detector Timing Calibration for PET Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for measuring timing differences in PET imaging systems are time-consuming and costly due to the indirect nature of the iterative process used to account for electronic pathway disparities, which affects the accuracy of timing resolution and spatial resolution in PET imaging.
Innovation Solution
A system and method utilizing after-pulse detector devices connected to photosensors via electronic pathways to detect and calibrate timing differences, with processing devices determining relative delays and storing them for calibration, allowing for direct measurement of timing offsets between pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods using external radioactive sources and iterative processing are used to measure timing disparities, then measurement precision can be achieved, but measurement time and cost increase significantly
Solution Approach 1:
The photosensor generates after-pulses internally that are used to calibrate the electronic pathway timing disparities. This self-service approach eliminates the need for external radioactive sources and iterative processing, providing both fast and accurate timing calibration while reducing cost and complexity
Solution Approach 2:
After-pulses serve as an intermediary signal that bridges the photosensor output and the timing calibration process. These after-pulses travel through the same electronic pathways as the main signal, allowing direct measurement of timing disparities without requiring external calibration sources
2Measurement precision
If conventional iterative methods are used to process timing data, then accurate timing calibration can be achieved, but device complexity and processing cost increase
Solution Approach 1:
The system uses its own internally generated after-pulses for calibration purposes, eliminating the need for complex external calibration equipment and iterative processing algorithms. The after-pulses provide direct timing information that simplifies the calibration process
Solution Approach 2:
The method extracts timing calibration information directly from the after-pulse signals that are already present in the photosensor output. By extracting this information from the existing signal structure, the system avoids the need for separate calibration procedures and complex iterative 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 approach significantly accelerates the calibration process, improves timing accuracy, and enhances the spatial resolution of PET imaging by directly measuring relative timing offsets, reducing the reliance on external sources and iterative methods.
Implementation Method 1
a detector including a photosensor that outputs a signal
Implementation Method 2
a plurality of after-pulse detector devices independently connected to the photosensor via respective electronic pathways that detect an after-pulse in the output signal
Data Source
AI summary
A process and system including a detector having a photosensor therein that outputs a signal and a plurality of after-pulse detector devices independently connected to the photosensor via respective pathways. The after-pulse detector devices each detecting an after-pulse in the signal, where the after-pulse represents an after-event in the photosensor triggered from a previous photon generating event. The system further includes a processing device that receives an indication of the detection of the after-pulse from each of the plurality of after-pulse detector devices and determines a relative delay between the respective pathways based on timing the received indications, and includes a memory that stores the relative delay in association with an identification of the corresponding after-pulse detector devices.