PET System Count Loss Correction via Virtual Crystal Copying
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Positron Emission Computed Tomography (PET) systems experience count loss during continuous incremental scanning due to the relative movement between detectors and patients, leading to inaccurate image reconstruction from reduced photon counts.
Innovation Solution
A method is introduced to correct count loss by constructing a virtual PET system with virtual crystals corresponding to real crystals, determining count loss correction factors for virtual Lines of Response (LORs) based on real LORs, and applying these factors to correct true coincidence counting rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous incremental scanning mode is used to improve scanning efficiency and reduce scanning time, then productivity is improved, but count loss occurs leading to degraded measurement precision
Solution Approach 1:
The patent creates a virtual PET system with virtual crystals that copies the structure and response characteristics of the real PET system. By simulating the scanning process in the virtual system and calculating count loss correction factors, the method compensates for count loss in the real system without interrupting the continuous scanning process, thus maintaining both high productivity and measurement precision
Solution Approach 2:
The patent changes the operational parameters of the PET system by introducing count loss correction factors that are calculated based on single-photon counting rates. These correction factors are applied to adjust the measured coincidence counting rates, effectively compensating for the count loss that occurs during continuous incremental scanning and restoring measurement precision
2Ease of operation
If continuous incremental scanning is performed to maintain patient comfort and reduce motion artifacts, then ease of operation is improved, but count loss increases leading to degraded image quality
Solution Approach 1:
By creating a virtual copy of the PET system and scanning process, the method can calculate count loss correction factors without affecting the actual continuous scanning of the patient. This allows the patient to remain comfortable during continuous scanning while the virtual system compensates for the resulting count loss
Solution Approach 2:
The virtual PET system acts as an intermediary that mediates between the real scanning process and the image reconstruction process. It calculates correction factors that bridge the gap between the continuous scanning data (which has count loss) and the accurate image reconstruction requirements
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 ensures accurate image reconstruction by compensating for count loss in PET systems during continuous incremental scanning, maintaining image quality by accounting for photon counts across varying scanning positions.
Implementation Method 1
For Positron Emission Computed Tomography (PET), γ-photons emitted from a human body are detected
Implementation Method 2
γ-photons emitted from a human body are detected
Data Source
AI summary
Methods, devices and systems for correcting a count loss in a Position Emission Computed Tomography (PET) system are provided. In one aspect, a method includes: constructing a virtual system including a plurality of virtual crystals, determining, for each of virtual Lines of Response (LORs) in the virtual system, a plurality of real LORs corresponding to the virtual LOR in the PET system, each of the real LORs corresponding to a scanning state of the PET system with a continuous incremental scanning mode, determining a count loss correction factor of the corresponding real LOR in each of the scanning states, determining a count loss correction factor of the virtual LOR according to the determined count loss correction factors of the plurality of real LORs corresponding to the virtual LOR, and performing count loss correction for the virtual LOR according to the determined count loss correction factor of the virtual LOR.