Partial Gating PET Imaging Motion Artifact Reduction
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Solution Overview
Problem
Conventional PET imaging techniques face challenges in producing clear images of moving and stationary body regions due to motion artifacts, which are exacerbated by full gating that reduces the signal-to-noise ratio of the entire image.
Innovation Solution
Implementing partial gating by identifying and excluding coincidences associated with moving regions during PET data acquisition, while scaling the remaining coincidences to maintain image quality of stationary regions, and utilizing Time-of-Flight PET data to refine the process and improve signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full gating is applied to eliminate motion artifacts in PET imaging, then image clarity of moving regions is improved, but signal-to-noise ratio of the entire image deteriorates
Solution Approach 1:
The patent segments the image volume into moving regions and stationary regions based on motion detection. Gating is applied selectively only to moving regions while stationary regions use all detected coincidences, thus avoiding the signal-to-noise ratio degradation that would result from applying gating to the entire volume.
Solution Approach 2:
The patent applies different image reconstruction strategies to different regions of the volume based on their motion characteristics. Moving regions receive gated data for improved clarity, while stationary regions use all available data for optimal signal-to-noise ratio,实现ing local optimization of image quality.
2Measurement precision
If gating is applied to reduce motion artifacts, then image quality of moving portions is improved, but signal-to-noise ratio of stationary portions deteriorates without benefit
Solution Approach 1:
The patent divides the imaged volume into moving and stationary portions through motion detection and analysis. This segmentation enables differential processing where gating is applied only where needed (moving portions) while stationary portions retain all coincidence data for reconstruction.
Solution Approach 2:
Instead of applying gating to the entire volume (excessive action), the patent applies gating only to the extent necessary - specifically to moving regions that exhibit periodic motion. This partial action approach maintains signal-to-noise ratio in stationary regions while still improving image quality in moving regions.
3Measurement precision
If coincidences are excluded based on motion periods, then motion artifacts are reduced, but the number of coincidences for reconstruction decreases
Solution Approach 1:
The patent segments the coincidence data based on spatial location and motion characteristics. Only coincidences from moving regions during motion periods are excluded, while coincidences from stationary regions and moving regions during quiescent periods are retained, thus preserving the quantity of usable coincidence data.
Solution Approach 2:
The patent changes the gating parameter application from a global setting (apply to all coincidences) to a local setting (apply only to specific coincidences from moving regions). This parameter change optimizes the balance between motion artifact reduction and preservation of sufficient coincidence data for reconstruction.
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 results in visually superior PET images that maintain the quality of both moving and stationary regions, improving the overall image clarity and signal-to-noise ratio compared to full or no gating techniques.
Implementation Method 1
Radioactive decay of the tracer generates positrons which eventually encounter electrons and are annihilated thereby. The annihilation produces two photons
Implementation Method 2
utilizing Time-of-Flight PET data to refine the process and improve signal-to-noise ratio
Data Source
AI summary
Systems and methods to partially-gate PET data include acquisition of first data describing a plurality of coincidences detected during a scan of an object, each of the plurality of coincidences associated with a coincidence time and a line of response, determination of lines of response which pass through a region of the object, determination of time periods of motion of the region, modification of the first data to remove coincidences which are associated with the determined lines of response and which are associated with coincidence time during the determined time periods of motion of the region, reconstruction of an image of the object based on the modified first data, and display of the image.