CN-115413101-B - Method and system for controlling output intensity of X-ray source

CN115413101BCN 115413101 BCN115413101 BCN 115413101BCN-115413101-B

Abstract

According to the method and the system for controlling the output intensity of the X-ray source, disclosed by the invention, the working voltage, the filament current and the working temperature are utilized to predict the output intensity of the X-ray source, and the target working voltage and the target filament current corresponding to the output intensity target value are determined based on the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source, so that the temperature drift problem caused by temperature rise when the X-ray source works for a long time is considered in the determining process of the target working voltage and the target filament current, and the stability of the output intensity of the X-ray source is improved.

Inventors

HUANG QIAN
JIANG CHENG
LI YE
ZHAO PENG
XU WEI

Assignees

北京山水云图科技有限公司

Dates

Publication Date: 20260505
Application Date: 20220816

Claims (5)

1. A method for controlling the output intensity of an X-ray source, comprising: The method comprises the steps of obtaining the actual output intensity and the working parameters of an X-ray source, wherein the working parameters comprise working voltage, filament current, working temperature, ray tube shape parameters, air humidity and equipment transmission loss, the working temperature is actually target temperature, the corresponding relation exists between the target temperature and the tube body temperature, the tube body temperature is adopted in the practical application of the working temperature, the ray tube shape is represented by the inclination angle of a target surface and the shape parameters of the ray tube with the external dimensions, and the equipment transmission loss is determined by the power consumption, heat dissipation and material temperature rise characteristics of the X-ray source; Inputting the working voltage, the filament current, the working temperature, the shape parameter of the ray tube, the air humidity and the equipment transmission loss into a preset output intensity prediction model to obtain an output intensity prediction value, wherein the preset output intensity prediction model is obtained by training according to sample data, and the preset output intensity prediction model is an RBF neural network model; Inputting the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source into a preset controller model, and determining a target working voltage and a target filament current corresponding to the output intensity target value, wherein the preset controller model is a PID controller model; Controlling the X-ray source to work by utilizing the target working voltage and the target lamp wire current; The training process of the RBF neural network model is as follows: Acquiring a plurality of sample data, wherein each sample data comprises a historical actual output intensity, a historical operating voltage, a historical filament current, a historical operating temperature, a ray tube shape parameter, a historical air humidity and equipment transmission loss; inputting a historical working voltage, a historical filament current, a historical working temperature, a ray tube shape parameter, a historical air humidity and equipment transmission loss into an initial RBF neural network model for training according to each sample data to obtain a historical output intensity predicted value corresponding to each sample data until the difference between the historical actual output intensity in each sample data and the corresponding historical output intensity predicted value is smaller than a preset threshold value, and determining the trained initial RBF neural network model as the RBF neural network model; Inputting the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source into a preset controller model, and determining a target working voltage and a target filament current corresponding to the output intensity target value, wherein the method comprises the following steps of: Inputting the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source into a preset controller model, and determining an initial target working voltage and an initial target filament current corresponding to the output intensity target value; Calculating a first difference between the operating voltage set point and the initial target operating voltage and a second difference between the filament current set point and the initial target filament current; when the first difference value is smaller than a first difference value threshold and the second difference value is smaller than a second difference value threshold, the working voltage set value is used as the target working voltage, and the filament current set value is used as the target filament current; And when the first difference value is greater than or equal to a first difference value threshold value and/or the second difference value is greater than or equal to a second difference value threshold value, the initial target working voltage is used as the target working voltage, and the initial target filament current is used as the target filament current.
2. The method of claim 1, wherein controlling the X-ray source operation using the target operating voltage and the target filament current comprises: the target operating voltage and the target filament current are generated in a PWM control mode to control the operation of the X-ray source.
3. The method of claim 1, further comprising inputting the operating voltage, the filament current, and the operating temperature to the RBF neural network model to update the RBF neural network model.
4. An output intensity control system of an X-ray source, characterized by comprising a signal acquisition device and an adjustment control device, wherein the signal acquisition device is used for acquiring the actual output intensity of the X-ray source and sending the actual output intensity to the adjustment control device, the adjustment control device is also connected with the X-ray source so as to acquire the working parameters of the X-ray source, and the adjustment control device is used for executing the output intensity control method according to any one of claims 1 to 3.
5. The system of claim 4, further comprising a monitoring device, wherein the monitoring device is respectively connected with the signal acquisition device and the X-ray source, and the monitoring device is used for sending out alarm information when the abnormal working state of the signal acquisition device and/or the abnormal working state of the X-ray source is monitored.

Description

Method and system for controlling output intensity of X-ray source Technical Field The present invention relates generally to the field of X-rays. More particularly, the present invention relates to a method and system for controlling the output intensity of an X-ray source. Background Since X-rays are found by German physicist in 1985, along with the development of society economy and technology, the application of X-rays is more and more extensive, for example, the X-rays shadow exists in the fields of medicine, PCB detection and the like, which brings great influence to the scientific development and daily life of people. Meanwhile, in order to accommodate various use requirements of X-rays, X-ray sources generating X-rays are also being continuously developed and improved. In more specific applications, various X-ray sources are required to generate X-rays with corresponding output intensities according to the actual application scenario. According to the output intensity of the X-ray, the working voltage and the characteristic that the filament current is changed in a specific way, at present, a common control mode of the output intensity of the X-ray source is to control the output intensity of the X-ray source to be stable by controlling the working voltage and the filament current of the X-ray source to be stable near a set value. The inventors have found in the practice of the present invention that even if the operating voltage and filament current of the X-ray source are stable, the actual output intensity may fluctuate. However, in some specific application scenarios, the stability of the output intensity of the X-ray source is necessary, but the existing X-ray source can only obtain a stable output intensity for a certain time or condition, so that the X-ray source is difficult to meet the long-term working requirement. Disclosure of Invention To solve one or more of the above-mentioned technical problems, embodiments of the present invention propose to use the operating temperature of the X-ray source for the output intensity control of the X-ray source. To this end, the present invention provides solutions in various aspects as follows. In a first aspect, an embodiment of the present invention provides a method for controlling output intensity of an X-ray source, including obtaining an actual output intensity of the X-ray source and an operating parameter, where the operating parameter includes an operating voltage, a filament current, and an operating temperature; determining an output intensity prediction value according to the working voltage, the filament current, the working temperature and a preset output intensity prediction model, wherein the preset output intensity prediction model is obtained by training according to sample data; inputting the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source into a preset controller model, and determining a target working voltage and a target filament current corresponding to the output intensity target value; And controlling the X-ray source to work by utilizing the target working voltage and the target lamp wire current. In a specific implementation manner of the first aspect, the working parameters further comprise a ray tube shape parameter, air humidity and equipment transmission loss, and determining the output intensity predicted value according to the working voltage, the filament current, the working temperature and a preset output intensity predicted model comprises the steps of inputting the working voltage, the filament current, the working temperature, the ray tube shape parameter, the air humidity and the equipment transmission loss into the preset output intensity predicted model to obtain the output intensity predicted value. In a specific implementation manner of the first aspect, determining a target operating voltage and a target filament current corresponding to the output intensity target value according to the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source includes determining an initial target operating voltage and an initial target filament current corresponding to the output intensity target value according to the actual output intensity, the output intensity predicted value and the output intensity target value of the X-ray source, calculating a first difference between an operating voltage set value and the initial target operating voltage, and a second difference between a filament current set value and the initial target filament current, taking the operating voltage set value as the target operating voltage when the first difference is smaller than a first difference threshold and the second difference is smaller than a second difference threshold, taking the initial target operating voltage as the target operating voltage when the first difference is larger than or equal to a f