Scintillation Event Position Determination in Radiation Particle Detector
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Solution Overview
Problem
Current PET scanners face challenges in accurately localizing scintillation events when information from multiple photosensors is missing, leading to deteriorated spatial resolution and event localization, especially due to dead time or inactivity of photosensors.
Innovation Solution
A method is introduced to determine the probability of each photosensor measuring photons exceeding a threshold, calculate the likelihood of scintillation events based on photon distribution and triggering probability, and identify the scintillator element location with the maximum likelihood, giving higher weight to photosensors with higher triggering probabilities to improve localization accuracy even when some photosensor information is missing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Anger logic is used to localize scintillation events, then spatial resolution is improved beyond single photosensor size, but localization accuracy deteriorates when multiple photosensors are missing information
Solution Approach 1:
The patent changes the parameter of photosensor weight in the localization calculation. Instead of uniform weighting in Anger logic, the invention introduces variable weights based on triggering probability, allowing the system to adapt to missing information from multiple photosensors while maintaining improved spatial resolution
Solution Approach 2:
The patent performs preliminary determination of triggering probabilities for all photosensors before conducting the localization calculation. This preliminary action allows the system to pre-assess which photosensors are likely to provide reliable information, enabling robust localization even when multiple photosensors are missing data
2Reliability
If maximum-likelihood methods are used to improve robustness against missing photosensor information, then performance improves when single photosensor information is missing, but localization deteriorates when multiple photosensors are missing information
Solution Approach 1:
The patent modifies the maximum-likelihood approach by introducing variable weighting parameters based on triggering probability. This parameter change allows the method to maintain robustness when single photosensor information is missing while preventing deterioration when multiple photosensors are missing information
Solution Approach 2:
The patent introduces dynamic weighting where the contribution of each photosensor to the likelihood calculation varies based on its triggering probability. This dynamic approach allows the system to adaptively adjust the influence of each photosensor, maintaining performance across different missing information scenarios
3Measurement precision
If small scintillator element locations are used to increase resolution, then spatial resolution is improved, but the system becomes more sensitive to missing photosensor information
Solution Approach 1:
The patent compensates for the increased sensitivity to missing information in high-resolution systems by changing the weighting parameter based on triggering probability. This allows small scintillator element locations to maintain both their high spatial resolution and robustness against missing photosensor information
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 method enhances the localization of scintillation events and improves spatial resolution by reducing the impact of missing photosensor data, providing more accurate image representation in nuclear imaging systems.
Implementation Method 1
multiple scintillator element locations which are configured to emit a burst of photons responsive to a radiation particle being absorbed at the scintillator element location
Implementation Method 2
a plurality of photosensors optically coupled to the scintillator element locations
Data Source
AI summary
A method for determining the position of a scintillation event in a radiation particle detector with multiple scintillator element locations which are configured to emit a burst of photons responsive to a radiation particle being absorbed at the scintillator element location and with a plurality of photosensors (5.1, 5.2, 5.3, 5.4) optically coupled to said scintillator element locations, comprising the steps of determining, for each of the photosensors (5.1, 5.2, 5.3, 5.4), a triggering probability indicative of the probability of said photosensor (5.1, 5.2, 5.3, 5.4) measuring a number of photons that exceeds a predetermined triggering threshold; measuring a photon distribution with the photosensors (5.1, 5.2, 5.3, 5.4) indicative of the number of photons incident on the individual photosensors (5.1, 5.2, 5.3, 5.4); calculating, for each of the scintillator element locations, a likelihood that a scintillation event with a predetermined energy value took place in said scintillator element location based on the measured photon distribution and the triggering probability of each of the photosensors (5.1, 5.2, 5.3, 5.4); and identifying the scintillator element location having the maximum likelihood.