Direct-Conversion X-Ray Detector Cone-Angle Electric Field Control
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Solution Overview
Problem
Direct-conversion X-ray detectors experience deterioration in space resolution due to cone angle, leading to degraded image quality, particularly from oblique X-ray incidence.
Innovation Solution
The X-ray detector employs a configuration with plural high voltage electrodes and read electrodes aligned in the cone angle direction, where the potential control device adjusts voltages to create an electric field direction based on the cone angle, ensuring that electric charges from obliquely incident X-rays are read by the same electrode, reducing scatter and improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional direct-conversion X-ray detector is used, then the detector can detect X-rays, but space resolution deteriorates in the cone angle direction due to oblique X-ray incidence
Solution Approach 1:
The patent applies local quality by making the electric field direction position-dependent through multiple high voltage electrodes arranged in the cone angle direction. Each electrode region creates a localized electric field that matches the local X-ray incidence angle, ensuring that electric charges from oblique X-rays are directed to the correct read electrode. This resolves the space resolution deterioration by ensuring that X-rays incident on the same position are read by the same electrode, reducing scatter-related image degradation.
2Measurement precision
If multiple high voltage electrodes are arranged in the cone angle direction, then space resolution is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the high voltage electrode structure into multiple discrete high voltage electrodes arranged in the cone angle direction. Each electrode is associated with a specific read electrode, creating segmented detection regions. This segmentation enables the system to distinguish between X-rays incident from different cone angle directions, improving space resolution while maintaining manageable complexity through modular electrode design.
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 configuration enhances space resolution in the cone angle direction, allowing for accurate reconstruction of CT image data and improved image quality by ensuring that X-rays incident on the same position are read by the same electrode, thereby reducing scatter-related image degradation.
Implementation Method 1
a semiconductor device (122) converting the incident X-ray into an electric charge
Implementation Method 2
a potential control device (120) forming an electric field in a direction based on a cone angle between the plural read electrodes (123a to 123e) and the plural high voltage electrodes (121a to 121e)
Implementation Method 3
electric charges converted from the incident X-ray move in a direction along an inclination of the direction of the electric field
Data Source
AI summary
A direct-conversion X-ray detector according to an embodiment includes a plurality of anode electrodes, at least one cathode electrode, and electric-field forming circuitry. The anode electrodes are aligned in a cone angle direction of an incident X-ray. The cathode electrode is positioned on an incident side of an X-ray relative to the anode electrodes, and that opposes the anode electrodes. The electric-field forming circuitry configured to form an electric field in a direction based on a cone angle of the X-ray, between the anode electrodes and the cathode electrode.