X-ray Detector Charge Sharing Management Circuit
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Solution Overview
Problem
Semiconductor X-ray detectors face challenges in accurately measuring X-ray photon energy due to charge sharing, where multiple charge carriers generated by a single photon are collected by multiple pixels, leading to inaccurate energy determination and counting errors.
Innovation Solution
The system includes an X-ray absorption layer with a controller that determines when charge carriers from a single photon are shared between pixels, resetting the signals associated with these pixels to zero to prevent incorrect energy measurement, and uses a counter to register X-ray photons only when they are not shared, thereby ensuring accurate energy determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor X-ray detectors are used to directly convert X-ray into electric signals, then detection performance is improved, but charge sharing causes inaccurate energy measurement and counting errors
Solution Approach 1:
A charge sharing management circuit is introduced as an intermediary between the pixel electrodes and the signal processing electronics. This circuit detects when charge carriers from a single photon are collected by multiple pixels and manages the shared charge signals appropriately, preventing measurement errors while maintaining the high detection performance of semiconductor detectors
Solution Approach 2:
The system uses feedback mechanisms where the controller monitors the signals from multiple pixels, identifies charge sharing events based on correlated signals, and adjusts the counting and energy measurement processes accordingly. This feedback loop enables the system to distinguish between genuine multiple photon events and charge sharing artifacts
2Quantity of substance
If multiple pixels collect charge carriers from a single photon, then more signal is obtained, but energy determination becomes inaccurate
Solution Approach 1:
The system extracts and identifies charge sharing events by analyzing the temporal and spatial correlations of signals across multiple pixels. When charge sharing is detected, the system separates the management of these shared signals from the standard energy measurement process, using dedicated charge sharing management circuits to handle them differently and prevent contamination of the energy spectrum
3Device complexity
If charge sharing is not managed, then device complexity is reduced, but photon counting accuracy deteriorates
Solution Approach 1:
The charge sharing management circuit performs preliminary detection and management of charge sharing events before they affect the final photon counting and energy measurement results. By proactively identifying and managing shared charge signals, the system prevents counting errors without requiring complex post-processing or sacrificing system simplicity
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 enhances the accuracy of X-ray photon energy measurement and photon counting by preventing charge sharing errors, leading to improved performance in X-ray detection and imaging applications.
Implementation Method 1
When an X-ray photon is absorbed in the semiconductor layer, multiple charge carriers (e.g., electrons and holes) are generated
Data Source
AI summary
An apparatus suitable for detecting X-ray is disclosed. In one example, the apparatus comprises an X-ray absorption layer and a controller. The X-ray absorption layer comprises a first pixel and a second pixel. The controller is configured for determining whether all carriers generated in the X-ray absorption layer by an X-ray photon are collected by the first pixel and the second pixel, and determining the energy of the X-ray photon based on a sum of a first portion of the carriers that is collected by the first pixel and a second portion of the carriers that is collected by the second pixel.