PET Scanning Time Determination via CT-Based Attenuation Correction
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Solution Overview
Problem
In Positron Emission Tomography (PET) scanning, different body regions have varying ratios of attenuation and scattering of rays, leading to imbalanced image qualities when the same scanning time is used for each bed position, resulting in inferior merged images due to differing tissue structures and activity concentrations.
Innovation Solution
A method to determine PET scanning time proportions for each bed based on noise estimation from CT images, calculating residual true coincidence count ratios and adjusting scanning times to equilibrate imaging effects across beds, using attenuation and scattering correction factors to ensure consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If identical scanning time is utilized for each bed position, then the scanning process is simple and fast, but imbalanced image qualities of different regions are caused
Solution Approach 1:
The patent applies local quality by determining different scanning times for different bed positions based on their specific attenuation and scattering characteristics. Each bed position receives a customized scanning time parameter calculated from its residual true coincidence count ratio, ensuring that regions with higher attenuation/scattering receive longer scanning times while maintaining overall scanning efficiency.
2Manufacturing precision
If scanning time is adjusted for each bed position to equilibrate image quality, then uniform image quality across regions is achieved, but the calculation and determination process becomes complex
Solution Approach 1:
The patent applies preliminary action by pre-calculating attenuation correction factors and scattering correction factors for each bed position before the actual PET scanning. These correction factors are used to determine residual true coincidence count ratios in advance, allowing the scanning system to automatically allocate optimal scanning times without complex real-time calculations during the scan.
3Manufacturing precision
If longer scanning time is used for regions with high attenuation and scattering, then image quality in those regions improves, but total scanning time increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting scanning time parameters for different bed positions based on calculated residual true coincidence count ratios. Instead of using a fixed or uniformly increased scanning time, the system optimizes each bed's scanning time parameter individually, ensuring sufficient exposure for high attenuation regions while minimizing total scanning time through efficient parameter allocation.
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 uniform image quality across different body regions by adjusting scanning times according to residual true coincidence count ratios, improving the natural transition of PET scan images and reducing total scanning time while maintaining high image quality.
Implementation Method 1
measuring a space distribution and a time characteristic of rays emitted from the living organism
Implementation Method 2
ratios of attenuation and scattering of rays for scanning bed positions may likely be different
Implementation Method 3
ratios of attenuation and scattering of rays for scanning bed positions may likely be different
Data Source
AI summary
A method and apparatus for determining PET scanning time are provided. According to an example of the method, a CT image is divided into multiple single-bed CT images according to bed information of bed positions for a PET scan, wherein the CT image is obtained by performing a CT scan on a subject of the PET scan, and a one-to-one corresponding relation exists between the multiple single-bed CT images and all of the beds. A residual true coincidence count ratio is estimated for each of the beds based on corresponding single-bed CT image of the bed, and then a scanning time proportion for each of the beds may be determined based on each of the residual true coincidence count ratios for the beds.