PET Scanner Attenuation Map Generation via Crystal Decay
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Solution Overview
Problem
Current PET imaging systems without CT scanners or external radiative sources face challenges in generating accurate attenuation maps, leading to artifacts and inaccurate quantification in reconstructed images, and pose risks due to radiation exposure.
Innovation Solution
A method and system for generating attenuation maps using background events from PET scanner crystal units, eliminating the need for CT scanners or external sources by detecting and analyzing particles from radioactive decay within the scanner, thereby reducing equipment costs and radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CT scanners or external radiative sources are used to generate attenuation maps, then the accuracy of attenuation maps is improved, but the equipment cost and radiation exposure increase
Solution Approach 1:
The PET scanner's own crystal units, which naturally undergo radioactive decay, are utilized as the radiation source for generating attenuation maps. This eliminates the need for external radiative sources or CT scanners, thereby reducing equipment costs and radiation exposure while maintaining attenuation map accuracy through self-service functionality.
Solution Approach 2:
The background events caused by radioactive decay of crystal materials, which were previously considered harmful noise interfering with PET imaging, are converted into a beneficial resource for generating attenuation maps. By detecting and analyzing these background events, the system transforms a harmful factor into a useful function that eliminates the need for additional radiation exposure from CT scanners or external sources.
2Object-affected harmful factors
If background events from radioactive decay are used for attenuation map generation, then equipment cost and radiation exposure are reduced, but the accuracy and reliability of attenuation maps may deteriorate
Solution Approach 1:
The method extracts and separates background events caused by radioactive decay from the main PET imaging data. By identifying and isolating these specific background events, the system can utilize them for attenuation map generation without allowing them to interfere with the primary imaging function, thereby maintaining both accuracy and reducing radiation exposure.
Solution Approach 2:
The patent introduces an intermediary processing step that analyzes background events and converts them into attenuation map data through specific algorithms and calculations. This intermediary process ensures that the raw background events are properly transformed into accurate attenuation information, bridging the gap between the simple background detection and the required precision for medical imaging.
3Measurement precision
If additional scans with CT scanners are performed, then attenuation map quality is improved, but the scanning time and productivity are reduced
Solution Approach 1:
The patent merges the attenuation map generation function with the PET scanning process itself. By utilizing background events collected during the PET scan, the system combines two previously separate functions (PET imaging and attenuation map acquisition) into a single integrated process, thereby improving productivity without sacrificing attenuation map quality.
Solution Approach 2:
The background events are collected and analyzed during the PET scan acquisition phase, performing the attenuation map generation in advance before the actual PET image reconstruction. This preliminary action eliminates the need for separate post-processing scans, thereby improving scanning efficiency and overall productivity.
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 the generation of accurate attenuation maps without additional scans, improving PET image quality and reducing radiation exposure, while simplifying the scanning process and lowering equipment costs.
Implementation Method 1
the first particle and the second particle may be different types of particles produced by a radioactive decay of a crystal material of the PET scanner
Implementation Method 2
A positron generated by the decay of the radioactive tracer may travel within the subject and interact with an electron in the subject. The positron and the electron may annihilate, thus producing a pair of gamma photons with opposite propagation directions.
Data Source
AI summary
A method for attenuation map generation may include obtaining first PET data relating to first background events occur during a first PET scan, which is performed by a PET scanner with no subject within a detection tunnel of the PET scanner; obtaining second PET data relating to second background events occur during a second PET scan, which is performed by the PET scanner with a subject within the detection tunnel; generating, based on the first PET data and the second PET data, a target attenuation map of the subject, wherein the first background events and the second background events may occur when a first particle and a second particle are detected by crystal units of the PET scanner within a background coincident window, and the first particle and the second particle may be different types of particles produced by a radioactive decay of a crystal material of the PET scanner.