PET Detector Energy Windows for Scattering Event Screening
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Solution Overview
Problem
Existing PET systems struggle to differentiate between scattering coincidence events occurring in the scanning object and those occurring in the detector, leading to reduced sensitivity due to the inability of current energy window determination methods.
Innovation Solution
A method involving the division of a PET detector into first and second regions based on absorption depth curves, with tailored energy windows in each region to screen and retain scattering events, utilizing detector parameters and iterative calculations to optimize energy window settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single energy window is used to screen scattering events, then the system structure is simple, but the sensitivity of the PET system is reduced because it cannot distinguish between scattering events in the scanning object and the detector
Solution Approach 1:
The detector is divided into a first region and a second region along the depth direction based on the absorption depth curve. The first region corresponds to a first energy window for screening scattering events in the scanning object, while the second region corresponds to a second energy window for retaining scattering events in the detector. This segmentation allows differentiation of scattering event sources without requiring a completely new system architecture.
Solution Approach 2:
Different energy window settings are applied to different regions of the detector based on their specific functions. The first region uses a first energy window optimized for screening object scattering, while the second region uses a second energy window optimized for retaining detector scattering. This local optimization improves overall sensitivity while maintaining manageable system complexity.
2Measurement precision
If scattering events in the detector are screened out, then the signal-to-noise ratio is improved, but the sensitivity is reduced due to loss of valid coincidence events
Solution Approach 1:
The detector is divided into a first region and a second region along the depth direction based on the absorption depth curve. The first region corresponds to a first energy window for screening scattering events in the scanning object, while the second region corresponds to a second energy window for retaining scattering events in the detector. This segmentation allows differentiation of scattering event sources without requiring a completely new system architecture.
Solution Approach 2:
Different energy window settings are applied to different regions of the detector based on their specific functions. The first region uses a first energy window optimized for screening object scattering, while the second region uses a second energy window optimized for retaining detector scattering. This local optimization improves overall sensitivity while maintaining manageable system complexity.
3Reliability
If the energy window is widened to retain more scattering events in the detector, then the sensitivity is improved, but the signal-to-noise ratio deteriorates due to inclusion of more noise events
Solution Approach 1:
The detector is divided into a first region and a second region along the depth direction based on the absorption depth curve. The first region corresponds to a first energy window for screening scattering events in the scanning object, while the second region corresponds to a second energy window for retaining scattering events in the detector. This segmentation allows differentiation of scattering event sources without requiring a completely new system architecture.
Solution Approach 2:
Different energy window settings are applied to different regions of the detector based on their specific functions. The first region uses a first energy window optimized for screening object scattering, while the second region uses a second energy window optimized for retaining detector scattering. This local optimization improves overall sensitivity while maintaining manageable system complexity.
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
Improves the sensitivity of PET systems by accurately distinguishing between scattering events in the scanning target and detector, enhancing the signal-to-noise ratio without increasing costs.
Implementation Method 1
obtaining an absorption depth curve of photons of a detector of the PET system
Implementation Method 2
a material type of a scintillation crystal in the detector
Data Source
AI summary
The embodiments of the present disclosure provide a method and device for screening scattering events, a PET system, an electronic device, and a storage medium. The method includes obtaining an absorption depth curve of photons of a detector of the PET system, dividing the detector into a first region and a second region along a depth direction of the detector based on the absorption depth curve; determining a first energy window in the first region to screen scattering events occurred in the scanning target; and determining a plurality of second energy windows in the second region to retain scattering events occurred in the detector. The detector includes a plurality of detector layers, the depth direction of the detector is a direction of the plurality of detector layers away from a scanning target, and the plurality of second energy windows are sequentially widened in the depth direction.