CT X-ray Tube Focus Size Control via Resolution Mode
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Solution Overview
Problem
In X-ray computed tomography apparatuses, the existing method of switching focus size based on the set tube current value does not consider the channel pitch, leading to suboptimal focus size for designated resolution modes, particularly in high resolution or super high resolution modes.
Innovation Solution
An X-ray computed tomography apparatus that includes an X-ray tube, detector, acquisition circuitry, high voltage generator, and processing circuitry, which determines the focus size based on the resolution mode, application dose condition, and X-ray exposure time using time-tube current and width-tube current tables to ensure optimal focus size for target CT imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the focus size is switched based on the set tube current value, then the tube current control is simplified, but the imaging resolution deteriorates because the channel pitch is not taken into consideration
Solution Approach 1:
The patent changes the control parameters from solely tube current-based focus size selection to a dual-parameter system considering both tube current value and channel pitch. The processing circuitry determines optimal focus size by referencing tables that map tube current values to appropriate focus sizes specific to each resolution mode, thereby resolving the contradiction between simplified control and imaging resolution.
2Measurement precision
If a small focus size is used for high resolution mode, then the imaging resolution is improved, but the X-ray exposure time must be increased to maintain sufficient signal, which reduces productivity
Solution Approach 1:
The patent implements dynamic focus size selection that adapts to the specific imaging conditions. The processing circuitry dynamically determines the optimal focus size by considering both the resolution mode requirements and the tube current settings, allowing the system to optimize the balance between resolution and exposure time for each specific imaging scenario rather than using a fixed focus size.
3Measurement precision
If the reading channel pitch is reduced for super high resolution mode, then the measurement precision is improved, but the optimal focus size cannot be achieved with existing tube current-based switching, worsening the imaging quality
Solution Approach 1:
The patent introduces resolution mode as an additional parameter in the focus size determination process. The processing circuitry references resolution mode-specific tables that map tube current values to optimal focus sizes, enabling precise focus size optimization tailored to each resolution mode's channel pitch characteristics.
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
Enables optimal focus size determination for various resolution modes, improving imaging quality by considering the channel pitch and exposure time, thereby enhancing the resolution and throughput of CT imaging.
Implementation Method 1
an X-ray tube 13 that generates X-rays
Implementation Method 2
an X-ray detector 15 that detects the X-rays
Data Source
AI summary
According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube, an X-ray detector, acquisition circuitry, a high voltage generator, and processing circuitry. The acquisition circuitry acquires electrical signals from a plurality of X-ray detection elements, and bundles the electrical signals in bundle units in accordance with a resolution mode of the X-ray detector. The processing circuitry determines a resolution mode, an application dose condition, and an X-ray exposure time for target CT imaging. The processing circuitry determines the focus size for the target CT imaging based on the determined resolution mode, application dose condition, and X-ray exposure time.