Photon Counting Detector Charge Sharing Correction
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Solution Overview
Problem
Photon counting detector-based x-ray computed tomography (PCD-CT) systems face challenges with charge sharing, leading to inaccurate photon counts, degraded image quality, and increased noise due to the detection of x-rays by multiple anodes, which current correction methods either slow down the detection process or fail to effectively eliminate noise.
Innovation Solution
The implementation of a multi-energy inter-pixel coincidence counter (MEICC) system that uses energy-dependent coincidence counters to record and correct charge sharing events during data acquisition, providing exact counts for post-acquisition correction without interfering with the primary counting process, thus maintaining the speed and accuracy of PCDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If event-based real-time charge sharing correction is implemented, then charge sharing accuracy is improved, but detector speed decreases significantly
Solution Approach 1:
The patent implements preliminary action by recording coincidence events during data acquisition using energy-dependent coincidence counters (EDCC) before the actual counting process. This allows the system to capture charge sharing information in advance without interrupting the primary detection workflow, enabling post-acquisition correction that maintains both accuracy and speed.
Solution Approach 2:
The patent segments the correction process from the primary counting process by using separate coincidence counters dedicated to recording charge sharing events. This segmentation allows independent operation of correction functionality without bottlenecking the main detection pipeline, resolving the speed-accuracy tradeoff.
2Measurement precision
If event-based real-time charge sharing correction is implemented, then charge sharing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary component - the energy-dependent coincidence counter (EDCC) - that specifically targets and records coincidence events. This intermediary handles the complex task of charge sharing detection separately, allowing the primary counting circuitry to remain simple and efficient while accuracy is enhanced by the specialized coincidence counting mechanism.
3Speed
If reading-based post-acquisition charge sharing correction is implemented, then detector speed is maintained, but charge sharing correction effectiveness is reduced
Solution Approach 1:
The patent replaces complex real-time mechanical/electronic correction mechanisms with a streamlined system that uses energy-dependent coincidence counters to record events during acquisition, followed by simpler post-acquisition processing. This substitution maintains detector speed while achieving effective correction through the energy-dependent filtering capability that distinguishes true coincidence events from random overlaps.
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
The MEICC system significantly reduces the Cramer-Rao lower bound (CRLB) values, improving the signal-to-noise ratio and spectral information, especially for K-edge imaging, while maintaining the speed of PCDs, and effectively addressing charge sharing issues without the drawbacks of existing correction methods.
Implementation Method 1
receiving, by a plurality of anodes, a photon via one or more of the plurality of anodes
Data Source
AI summary
A method, a system, a device, and a computer program produce for photon detection is disclosed. The method includes receiving, by a plurality of anodes, a photon via one or more of the plurality of anodes; measuring respective voltages of the photon at each of the plurality of anodes; counting incidents in which the photon is detected by more than one of the plurality of anodes based on the measuring; and outputting information regarding a counted number of incidents in which the photon is detected by more than one of the plurality of anodes, wherein the information regarding the courted number of incidents in which the photon is detected by more than one of the plurality of anodes is used as part of a production of an image associated with the received photon.