X-ray Tube Current Sensing Circuit for Radiography
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Solution Overview
Problem
Existing radiography devices face challenges in accurately measuring the anode current and maintaining stable voltage/current values, leading to image artifacts and the need for frequent recalibration.
Innovation Solution
An electromagnetic wave generation device with a current-sensing circuit that measures the current flowing between the anode and cathode, and adjusts the gate power value accordingly to automatically compensate for current variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high voltage is used in X-ray systems, then imaging capability is improved, but measurement precision of tube voltage deteriorates due to errors and image artifacts
Solution Approach 1:
The patent introduces an intermediary measurement device that couples to the X-ray tube through magnetic coupling between a primary coil on the tube and a secondary coil on the measurement device. This intermediary coupling allows voltage measurement without direct electrical contact, eliminating the errors and image artifacts that occur with direct high-voltage measurement methods.
2Measurement precision
If periodic recalibration is performed to maintain stability, then measurement precision is improved, but loss of time increases due to service personnel intervention
Solution Approach 1:
The measurement device enables self-service operation by allowing users to perform kVp/mA measurements and verification without requiring service personnel. The device is designed to be easily coupled to the X-ray tube and provides automatic measurements, eliminating the need for periodic manual recalibration by technicians.
3Ease of operation
If beam measurement is performed without service personnel, then ease of operation is improved, but measurement precision deteriorates due to inability to perform measurements during patient use
Solution Approach 1:
The measurement device enables continuous verification of X-ray tube performance by allowing measurements to be performed at any time, including during routine operation between patient examinations. The magnetic coupling design allows the measurement device to be quickly attached and detached, enabling ongoing monitoring without interrupting patient care workflows.
4Measurement precision
If expensive commercial instruments are used, then measurement precision is improved, but device complexity increases and ease of operation deteriorates
Solution Approach 1:
The measurement device is segmented into separate functional components: a primary coil that couples to the X-ray tube, a secondary coil on the measurement device, and signal processing electronics. This segmentation allows the complex measurement function to be distributed across simple, modular components that are easier to manufacture and operate than a single integrated expensive instrument.
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 accurate and automatic compensation of anode current, improving image quality and reducing the need for frequent recalibration, while also minimizing leakage current and ensuring stable operation.
Implementation Method 1
a current-sensing circuit connected to the tube and sensing a current flowing through the cathode. The current-sensing circuit may include at least one resistance associated with the sensing of at least one of an anode current and a gate current.
Implementation Method 2
An electromagnetic wave generation device includes a tube including an anode, a cathode and at least one gate... capable of steadily obtaining an optimal image by verifying the operation of the device based on the predicted value and the measured value of the current flowing between anode and the cathode
Data Source
AI summary
Provided is an electromagnetic wave generation device including a tube including an anode, a cathode and at least one gate, a first power supply circuit in which one side of an output terminal is connected to the anode, a second power supply circuit in which one side of an output terminal is connected to the gate, and a current-sensing circuit connected to the tube and sensing a current flowing through the cathode, in which the current-sensing circuit includes at least one resistance associated with the sensing of at least one of an anode current and a gate current.