Non-Conductive X-Ray Tube Throat for Transient Response
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Solution Overview
Problem
Conventional x-ray tubes face challenges in achieving rapid transient response due to eddy current generation in the throat portion, which slows down the magnetic field development and affects electron beam deflection and focusing, especially during rapid kV modulation and dual-energy scanning.
Innovation Solution
The x-ray tube design incorporates a non-electrically conductive throat portion made of materials like ceramic, which prevents eddy current generation, allowing for faster magnetic field development and improved electron beam manipulation, while maintaining hermeticity and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional electrically conductive throat portion is used, then structural integrity and hermeticity are maintained, but eddy currents are generated that slow down magnetic field development and reduce transient response
Solution Approach 1:
The patent changes the electrical conductivity parameter of the throat portion from conductive to non-conductive by using ceramic materials. This parameter change eliminates eddy current generation while maintaining the structural and hermetic functions of the throat portion, thereby reducing energy losses and improving transient response speed.
Solution Approach 2:
The patent employs composite construction by combining ceramic non-conductive materials with metallic support structures. The ceramic portion prevents eddy currents while the metal provides structural integrity and hermetic sealing, achieving both improved transient response and maintained mechanical strength through material composition.
2Measurement precision
If electromagnetic e-beam control is implemented for rapid deflection and focusing, then image quality is enhanced, but eddy currents in the throat portion oppose magnetic field penetration and increase rise time
Solution Approach 1:
By changing the throat portion from electrically conductive to non-conductive material, the patent eliminates the opposing eddy currents that delayed magnetic field penetration. This allows the electromagnetic control system to achieve rapid magnetic field development and fast e-beam deflection and focusing, improving both image quality and reducing time delays.
3Productivity
If a non-electrically conductive throat portion is used, then eddy current losses are reduced and transient response is improved, but manufacturing complexity and material selection constraints increase
Solution Approach 1:
The patent uses composite construction combining ceramic non-conductive materials with metallic components. This approach enables the throat portion to achieve non-conductive properties for improved transient response while the metal portions provide structural support and hermetic sealing, balancing manufacturing feasibility with performance requirements.
Solution Approach 2:
The throat portion is segmented into different material zones: ceramic sections where eddy current prevention is critical and metal sections where structural strength and hermeticity are priorities. This segmentation allows optimized material selection in different regions, improving transient response efficiency while maintaining manufacturability through modular construction.
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 design enhances the transient response of the x-ray tube by reducing eddy current losses, enabling quicker electron beam deflection and focusing, thereby improving image quality and maintaining focal spot size consistency across different scanning modes.
Implementation Method 1
eddy currents are generated in the vacuum vessel wall that opposes the magnetic field penetration inside the x-ray tube
Implementation Method 2
a rapidly changing magnetic field may be used to rapidly change the focusing of the electron beam
Implementation Method 3
an electrical current is passed therethrough, thus causing the emitter to increase in temperature and emit electrons when in a vacuum
Implementation Method 4
magnetic deflection (i.e., spatial modulation), which utilizes a rapidly changing magnetic field to control the e-beam
Data Source
AI summary
An x-ray tube assembly includes a vacuum enclosure having a cathode portion, a target portion, and a throat portion comprising a non-electrically conductive tube. The throat portion has an upstream end coupled to the cathode portion and a downstream end coupled to the target portion. The x-ray tube assembly also includes a target positioned within the target portion of the vacuum enclosure, and a cathode positioned within the cathode portion of the vacuum enclosure. The cathode is configured to emit a stream of electrons through the throat portion toward the target.