Cathode Cup Pocket Design for X-ray Focal Spot Control
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Solution Overview
Problem
Conventional X-ray tube cathode cup designs require time-consuming and inconsistent tab adjustments to control focal spot length, leading to performance variations and image distortions, which are exacerbated by increasing demands for higher resolution images.
Innovation Solution
A dual pocket cathode cup design with tailored pocket lengths for each filament, combined with a computer-simulated modeling approach to predict and adjust focal spot dimensions, eliminating the need for tabs and minimizing focal spot distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tabs are used to adjust focal spot length, then focal spot dimensions can be modified, but the adjustment process becomes time-consuming and inconsistent
Solution Approach 1:
The cathode cup is designed with pre-formed pockets of specific lengths during manufacturing, eliminating the need for post-production tab adjustments. The pocket lengths are predetermined and tailored to match filament lengths, allowing focal spot length to be set in advance during cathode cup fabrication rather than requiring time-consuming trial-and-error adjustments afterward.
Solution Approach 2:
The invention removes the tabs entirely from the cathode cup design, replacing them with a pocket structure that inherently defines the focal spot length. By extracting the adjustable tabs and incorporating the adjustment function directly into the pocket geometry, the system eliminates the problematic adjustment process while maintaining focal spot control capability.
2Manufacturing precision
If tabs are used to adjust focal spot length, then focal spot dimensions can be modified, but performance variations occur between units
Solution Approach 1:
The cathode cup is designed with pre-formed pockets of specific lengths during manufacturing, eliminating the need for post-production tab adjustments. The pocket lengths are predetermined and tailored to match filament lengths, allowing focal spot length to be set in advance during cathode cup fabrication rather than requiring time-consuming trial-and-error adjustments afterward.
Solution Approach 2:
The pocket structure automatically defines the focal spot length based on its predetermined geometry, eliminating the need for external tab components and manual adjustment procedures. The cathode cup design itself provides the focal spot length control function through its engineered pocket dimensions, ensuring consistent performance without relying on technician skill or iterative adjustment.
3Ease of manufacture
If conventional cathode cup designs are used, then production is simpler, but focal spot distortion increases
Solution Approach 1:
The cathode cup is designed with pre-formed pockets of specific lengths during manufacturing, eliminating the need for post-production tab adjustments. The pocket lengths are predetermined and tailored to match filament lengths, allowing focal spot length to be set in advance during cathode cup fabrication rather than requiring time-consuming trial-and-error adjustments afterward.
Solution Approach 2:
The invention changes the geometric parameters of the cathode cup by introducing pockets with specific length dimensions tailored to filament lengths. This parameter change in the pocket structure enables precise control of electron beam shaping and focal spot dimensions, reducing focal spot distortion while maintaining manufacturability through standardized pocket formation processes.
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 solution enables consistent focal spot adjustments and improved image quality by allowing precise control of focal spot dimensions during production, reducing distortion and enhancing the resolution of X-ray images.
Implementation Method 1
The cathode contains one or more filaments that, when subject to high voltage, release electrons via thermionic emission in the form of an electron beam
Implementation Method 2
The filaments are typically inset in channels of a cup structure that is part of the cathode, i.e., a cathode cup, that serves to focus the electron beam towards the anode
Implementation Method 3
A portion of the electron beam impacting the anode is refracted off as an X-ray beam
Data Source
AI summary
A cathode cup is provided. The cathode cup includes one or more pockets; and one or more filaments associated with the one or more pockets. A same number of pockets as filaments are present. Each pocket is associated with exactly one filament and is configured to have a length that is tailored to a length of the filament. The cathode cup can be used in an X-ray system having an anode and a cathode. A method of electron beam shaping is provided. The method includes the following steps. A computer-simulated model of a cathode cup is created. The model is used to predict focal spot dimensions. The predicted focal spot dimensions are compared to desired focal spot dimensions. The steps of creating, using and comparing are repeated until the predicted focal spot dimensions match the desired focal spot dimensions. A cathode cup is created based on the computer-simulated model.