PET Imaging Buffer Overflow Prevention via Selective Data Discarding
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Solution Overview
Problem
Nuclear medicine imaging apparatuses, such as PET-CT systems, face challenges in managing high counting rates, leading to overflow and discarding of counting information, which can result in deteriorated image quality due to insufficient coincidence counting information.
Innovation Solution
The apparatus implements a determination unit and discarding unit to intermittently discard counting information whose detection time exceeds a set duration, preventing overflow and maintaining image quality by selectively discarding data outside the time window, while allowing necessary coincidence counting information to be generated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If counting information is stored continuously in the buffer, then image quality is maintained through sufficient coincidence counting information, but buffer overflow occurs at high counting rates causing data loss
Solution Approach 1:
The system performs preliminary assessment of buffer capacity before storing new counting information. The determination unit checks whether the buffer has sufficient available capacity to accommodate incoming data, and only allows storage when capacity is sufficient. This preventive approach avoids buffer overflow and data loss while maintaining image quality by ensuring coincidence counting information is preserved when possible.
2Loss of information
If counting information is discarded to prevent buffer overflow, then data loss is reduced, but coincidence counting information may be insufficient leading to deteriorated image quality
Solution Approach 1:
The discarding unit applies selective discarding based on local characteristics of the counting information. It identifies and discards only those pieces of counting information that are least likely to contribute to coincidence counting (e.g., information that cannot form valid coincidence pairs or has lower diagnostic value), while preserving information that is critical for image reconstruction. This localized quality-based selection maintains image quality while preventing buffer overflow.
3Reliability
If all counting information is retained to ensure sufficient coincidence counting, then image quality is maintained, but processing capacity is exceeded at high counting rates
Solution Approach 1:
The system dynamically changes the parameter of counting information retention based on buffer capacity conditions. When buffer capacity is sufficient, the system retains all counting information to maximize coincidence counting. When buffer capacity is insufficient, the system changes the retention parameter by selectively discarding certain information. This dynamic parameter adjustment allows the system to adapt to varying counting rates and processing capacities while maintaining optimal image quality.
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 effectively suppresses the reduction in coincidence counting information, thereby maintaining the quality of PET images and ensuring that only necessary data is discarded, preventing unnecessary loss of information and ensuring accurate image reconstruction.
Implementation Method 1
a photon counting detector arranged around the subject... detects a pair of gamma rays
Data Source
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AI summary
According to one embodiment, a nuclear medicine imaging apparatus includes a counting information collection unit (520), a determination unit (522), and a discarding unit (523). The counting information collection unit (520) is configured to collect counting information including detection time of a gamma ray from a counting result output by a detector for counting light derived from a gamma ray, and to store the counting information in a buffer (521). The determination unit (522) is configured to determine whether the volume of the counting information stored in the buffer (521) exceeds a threshold. The discarding unit (523) is configured to, in a case that the determination unit (522) determines that the volume exceeds the threshold, intermittently discards, in chronological order, counting information whose detection time is within longer duration than predetermined duration used for generating two pieces of counting information obtained by counting pair annihilation gamma rays nearly coincidentally as coincidence counting information among the counting information collected from the detector.