PET Scanner TOF Assessment via Back Projection Image Comparison
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for assessing the Time of Flight (TOF) performance of PET scanners are time-consuming and costly, requiring extensive image reconstruction and correction processes.
Innovation Solution
A system and method that uses a back projection algorithm to generate images with and without TOF information, comparing these images to assess TOF performance by determining pixel ratios and symmetry, thereby reducing the need for correction operations and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image reconstruction and correction operations (normalized correction, attenuation correction, system dead time correction) are performed to assess TOF performance, then measurement precision is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent extracts the essential comparison between images with and without TOF information, removing the need for multiple correction operations. By directly comparing the reconstructed images, the method isolates the TOF performance assessment from unnecessary correction steps, significantly reducing assessment time while maintaining measurement precision
Solution Approach 2:
The patent performs preliminary image reconstruction with and without TOF information before assessment. By preparing these reference images in advance through back projection algorithms, the method eliminates the need for time-consuming correction operations during the actual TOF performance assessment, achieving both speed and accuracy
2Measurement precision
If multiple correction operations are performed during image reconstruction, then measurement precision is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent extracts the core TOF assessment function from the complex reconstruction and correction pipeline. By directly comparing images with and without TOF information using back projection, the method removes unnecessary correction operations, simplifying the overall process while preserving measurement precision
Solution Approach 2:
Instead of performing reconstruction first and then applying multiple corrections, the patent inverts the approach by directly comparing images with and without TOF information at the reconstruction stage. This inversion eliminates the need for subsequent correction operations, reducing device complexity while maintaining assessment accuracy
3Measurement precision
If multiple correction operations are performed during image reconstruction, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The patent extracts the essential TOF assessment comparison from the complex correction process. By directly comparing images with and without TOF information, the method removes time-consuming correction operations, significantly improving assessment productivity while maintaining measurement precision through the back projection algorithm
Solution Approach 2:
The patent performs preliminary reconstruction of images with and without TOF information using back projection algorithms. This preliminary action prepares the necessary comparison data in advance, eliminating the need for multiple correction operations and thereby improving overall assessment productivity without sacrificing measurement precision
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 allows for a more efficient and cost-effective assessment of TOF performance by directly comparing images reconstructed with and without TOF information, indicating better symmetry and thus better TOF performance.
Implementation Method 1
obtain raw data relating to radiation originating from an object from a positron emission tomography (PET) scan by a PET scanner
Implementation Method 2
radiation originating from an object from a positron emission tomography (PET) scan
Data Source
AI summary
A method for assessing the time of flight (TOF) performance of a positron emission tomography (PET) scanner is provided. The method may include obtaining raw data relating to radiation originating from an object from a PET scan by a PET scanner, the raw data including TOF information. The method may also include generating, based on a back projection algorithm, a first back projection image by reconstructing the raw data including the TOF information. The method may further include generating, based on the back projection algorithm, a second back projection image by reconstructing the raw data excluding the TOF information. The method may further include comparing the first back projection image with the second back projection image. The method may also include assessing, based on the comparison, the TOF performance of the PET scanner.