Dynamic Focal Spot Resizing for X-ray Tube Overheating
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Solution Overview
Problem
X-ray generating devices face overheating issues due to increased electron impingement, leading to potential premature deterioration or catastrophic failure of the anode element, especially when trying to balance focal spot size for image resolution and radiation output.
Innovation Solution
A method for load-dependent resizing of the focal spot in X-ray generating devices, which automatically adjusts based on temperature and load conditions to prevent overheating, allowing for dynamic changes in focal spot size and shape to maintain safe operating temperatures and prevent device failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electron flux is increased to increase X-ray output, then the radiation output is improved, but the focal spot temperature increases leading to overheating and potential failure
Solution Approach 1:
The patent implements dynamic focal spot resizing where the focal spot size is automatically adjusted based on real-time temperature monitoring and load conditions. The system transitions from a static focal spot size to a dynamically adaptable size that expands when temperature thresholds are approached, thereby resolving the contradiction between maintaining high power output and preventing overheating
Solution Approach 2:
The system changes the physical parameter of focal spot size in response to temperature and load conditions. By modifying this critical parameter dynamically, the system can operate at high power levels when conditions permit while automatically reducing power density when temperature becomes excessive, thus resolving the power-temperature contradiction
2Measurement precision
If the focal spot size is reduced to improve spatial resolution, then the image quality is improved, but the focal spot temperature increases due to concentrated heat load
Solution Approach 1:
The system dynamically adjusts focal spot size based on operating conditions rather than using a fixed small size. This allows the system to achieve high spatial resolution when temperature conditions permit while automatically enlarging the focal spot when temperature thresholds are approached, thus resolving the contradiction between resolution and temperature control
Solution Approach 2:
The patent implements a feedback mechanism where temperature sensors monitor focal spot temperature and this information is used to control focal spot size adjustments. The feedback loop ensures that spatial resolution is optimized when temperatures are safe while preventing overheating by enlarging the focal spot when necessary
3Temperature
If the focal spot size is enlarged to distribute heat load, then the temperature is reduced, but the spatial resolution deteriorates
Solution Approach 1:
Rather than using a permanently large focal spot, the system dynamically adjusts size based on thermal conditions. This allows the system to maintain small focal spot sizes for high resolution when temperatures are acceptable, while temporarily enlarging only when heat dissipation becomes critical, thus resolving the temperature-resolution trade-off
4Power
If the electron current is increased to increase X-ray output, then the radiation output is improved, but the reliability decreases due to increased risk of overheating and failure
Solution Approach 1:
The system uses temperature feedback to control electron current and focal spot size, preventing operation in unsafe thermal conditions. This feedback mechanism maintains high power output when temperatures are safe while automatically reducing current when temperature thresholds are approached, thus preserving reliability without unnecessarily limiting power output
Solution Approach 2:
The system dynamically adjusts operating parameters including electron current and focal spot size based on real-time temperature conditions. This dynamic adaptation allows the system to operate at high power levels when conditions permit while automatically reducing power density when reliability becomes compromised by excessive heat
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 approach enables the X-ray generating device to operate within safe temperature boundaries, preventing premature failure while maintaining image quality and patient safety, even when operating conditions exceed manufacturer specifications, by dynamically resizing the focal spot to manage heat and radiation output effectively.
Implementation Method 1
Regularly, electrons are accelerated between a cathode element and an anode element within an evacuated housing of an X-ray generating device for producing X-rays
Implementation Method 2
The electrons impinge on a part of the anode element called the focal spot, thus creating electromagnetic radiation
Implementation Method 3
By employing a rotating anode, the target, i.e. the area of impingement of the electrons or the focal spot, may be considered to be a stationary area on the surface of the rotating anode disk where moving elements of the target pass a stationary electron beam
Data Source
AI summary
In an X-ray generating device (2) a temperature of a focal spot (21) may be determined. Furthermore a load condition is determined, which may also take into account a planned operation procedure of the X-ray generating device (2). The focal spot of the X-ray generating device is then automatically resizable based at least in part on the load condition.