X-ray detector pixel voltage offset for inclined angle resolution
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Solution Overview
Problem
Inclined-angle X-ray detection using lower atomic number detector materials leads to spatial image resolution loss due to charge being wrongly allocated across multiple detector electrodes, resulting in degraded lateral image resolution.
Innovation Solution
An X-ray detector device with a cathode and anode surface segmented into pixels, where voltage offsets between adjacent pixels converge charge transport parallel to the coupling direction, aligning it with the axis of symmetry of the X-ray radiation beam, thereby reducing charge allocation errors and improving spatial image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inclined-angle detection is used with lower atomic number detector materials, then detective quantum efficiency is improved, but spatial image resolution deteriorates due to charge being shared over multiple electrodes
Solution Approach 1:
The cathode surface is segmented into multiple cathode pixels, and the anode surface is segmented into multiple anode pixels. This segmentation allows for independent voltage control of each pixel, enabling the implementation of voltage offsets to guide charge transport to the correct anode pixel, thereby resolving the charge sharing problem while maintaining inclined-angle detection benefits
Solution Approach 2:
Voltage offsets are applied between adjacent cathode pixels and anode pixels. By dynamically adjusting the voltage parameters, the electric field direction is modified to converge charge transport parallel to the coupling direction, ensuring accurate charge allocation to the correct anode pixel even during inclined-angle detection
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 effectively restores spatial image resolution by ensuring charge transport is directed parallel to the coupling direction, minimizing smearing across pixels and reducing lateral image resolution loss in inclined-angle X-ray detection.
Implementation Method 1
The cathode surface and the anode surface are displaced by a separation layer allowing charge transport between the cathode surface and the anode surface in response to X-ray radiation incident during operation on the cathode surface
Implementation Method 2
At least one of the cathode pixels is configured to be at a voltage offset relative to an adjacent cathode pixel and at least one of the anode pixels is configured to be at a voltage offset relative to an adjacent anode pixel. The voltage offset is configured to converge the charge transport in a direction parallel to the coupling direction
Data Source
AI summary
The invention relates to an X-ray detector device (10) for detection of X-ray radiation at an inclined angle relative to the X-ray radiation, an X-ray imaging system (1), an X-ray imaging method, and a computer program element for controlling such an X-ray imaging system for performing such method and a computer readable medium having stored such computer program element. The X-ray detector device (10) comprises a cathode surface (11) and an anode surface (12). The cathode surface (11) and the anode surface (12) are displaced by a separation layer (13) allowing charge transport (T) between the cathode surface (11) and the anode surface (12) in response to X-ray radiation incident during operation on the cathode surface (11). The anode surface (12) is segmented into anode pixels (121) and the cathode surface (11) is segmented into cathode pixels (111). At least one of the cathode pixels (111) is assigned to at least one of the anode pixels (121) in a coupling direction (C) inclined relative to the cathode surface (11). At least one of the cathode pixels (111) is configured to be at a voltage offset ΔU relative to an adjacent cathode pixel and at least one of the anode pixels (121) is configured to be at a voltage offset ΔU relative to an adjacent anode pixel (121). The voltage offset ΔU is configured to converge the charge transport (T) in a direction parallel to the coupling direction (C).