Pixelated Semiconductor Detector Grid Electrode Signal Correction
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Solution Overview
Problem
Pixilated semiconductor detectors, such as those made from cadmium zinc telluride (CZT), face challenges in distinguishing direct gamma rays and x-rays from scattered ones due to a low energy tail in the energy spectrum, caused by varying response in semiconductor material regions and incomplete charge integration, leading to ballistic deficit and poor spatial resolution.
Innovation Solution
A detector assembly with a pixelated semiconductor substrate, including a grid electrode circumscribing the central region of each pixel anode, measures signals between the anode and cathode, and between the grid electrode and cathode, combining these signals to correct for ballistic deficit and incomplete charge collection, thereby improving energy spectrum accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the semiconductor material response varies in different regions, then charge integration becomes incomplete causing ballistic deficit, but adding correction mechanisms increases device complexity
Solution Approach 1:
The detector incorporates feedback mechanisms where the measured signal from each pixel is used to adjust and correct the charge integration process. By monitoring the actual charge collection in each region and applying corrective algorithms, the system compensates for regional response variations and ballistic deficit without requiring complex hardware modifications to the detector structure.
Solution Approach 2:
The detector system performs self-correction by using its own measured data to identify and compensate for charge collection deficiencies. The readout electronics automatically adjust integration parameters based on detected signal characteristics, enabling the system to maintain complete charge collection without external intervention or complex additional correction mechanisms.
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 solution enhances the energy spectrum by reducing the low energy tail, improving the detector's ability to distinguish direct and scattered radiation, and optimizing spatial resolution, leading to more accurate imaging.
Implementation Method 1
detecting ionizing radiation using a detector assembly having a pixelated semiconductor substrate
Implementation Method 2
measuring a first signal between the at least one pixel anode and the cathode wherein the anode is electrically biased with respect to the cathode
Implementation Method 3
measuring a second signal between the grid electrode and the cathode wherein the grid electrode is electrically biased with respect to the cathode
Implementation Method 4
measuring a first signal between the at least one pixel anode and the cathode wherein the anode is electrically biased with respect to the cathode
Data Source
AI summary
A method of detecting ionizing radiation is provided. The method includes detecting ionizing radiation using a detector assembly having a pixelated semiconductor substrate, each pixel including a central region and a region of variable response, each pixel further including at least one anode, the detector assembly including a grid electrode coupled to a first surface of the semiconductor substrate such that the grid electrode circumscribes the central region of at least one pixel anode, the detector assembly further including a cathode coupled to a second surface of the semiconductor substrate, the method comprising, measuring a first signal between the at least one pixel anode and the cathode wherein the anode is electrically biased with respect to the cathode, measuring a second signal between the grid electrode and the cathode wherein the grid electrode is electrically biased with respect to the cathode, combining the magnitude of the first signal and the magnitude of the second signal to obtain a total signal from the semiconductor substrate, and outputting the total signal.