阅读说明：本技术 一种延长x射线球管灯丝寿命的方法 (Method for prolonging service life of X-ray bulb tube filament ) 是由 蒋建兰 于 2020-08-11 设计创作，主要内容包括：本发明公开一种延长X射线球管灯丝寿命的方法,一种延长X射线球管灯丝寿命的方法,在同样的射线剂量条件下,保持曝光电压不变,降低管电流,延长曝光时间,所述管电流根据所要检测身体的不同部位降低42.9％-83.3％；或在满足射线剂量的范围内,升高曝光电压的同时降低管电流与曝光时间,即在曝光电压升高15％的同时,管电流与曝光时间的乘积降低50％。(The invention discloses a method for prolonging the service life of a filament of an X-ray bulb tube, which is characterized in that under the condition of the same ray dosage, the exposure voltage is kept unchanged, the tube current is reduced, the exposure time is prolonged, and the tube current is reduced by 42.9-83.3% according to different parts of a body to be detected; or in the range satisfying the radiation dose, the tube current and the exposure time are reduced while the exposure voltage is increased, namely, the product of the tube current and the exposure time is reduced by 50% while the exposure voltage is increased by 15%.)

1. A method for prolonging the service life of a filament of an X-ray bulb tube is characterized in that: under the same radiation dose condition, the exposure voltage is kept unchanged, the tube current is reduced, the exposure time is prolonged, and the tube current is reduced by 42.9-83.3% according to different parts of a body to be detected; or in the range satisfying the radiation dose, the tube current and the exposure time are reduced while the exposure voltage is increased, namely, the product of the tube current and the exposure time is reduced by 50% while the exposure voltage is increased by 15%.

2. The method of extending the life of an X-ray tube filament of claim 1, wherein: the ray dose is the product of the tube voltage, the tube current and the exposure time.

3. The method of extending the life of an X-ray tube filament of claim 1, wherein: the reduction amplitude of the tube current is determined according to the thicknesses of different parts of a human body, and the reduction amplitude of the tube current of the part with the thicker part of the human body is smaller than that of the part with the thinner part of the human body.

Technical Field

The invention relates to the technical field of medical equipment, in particular to a method for prolonging the service life of a filament of an X-ray bulb tube.

Background

X-rays are widely used in modern medical imaging equipment, such as tomographic CT, gastrointestinal machine, digital radiography DR machine, angiography machine, small C-arm machine, breast machine, dental machine, etc. The core component of these imaging devices is the X-ray emitting assembly, known as the X-ray tube. The X-ray bulb tube consists of an anode, a cathode, a glass shell, insulating oil and a metal shell. The cathode is used for emitting electrons, under a very high electric field, the electrons bombard the target surface of the anode at a high speed, most of the electrons are converted into heat and are conducted out through the anode, and a part of the electrons become X rays.

The core of the cathode is a filament made of tungsten wires, when current passes through the tungsten wires, the temperature of the filament rises, the larger the current is, the higher the temperature of the filament is, the more electrons are emitted, and the more X rays are emitted by the X-ray bulb tube. Generally, the higher the filament temperature, the faster the tungsten element of the filament volatilizes, and the faster the filament ages. If the filament current rises 5% above the rated value, the filament life is doubled.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a method for prolonging the service life of a filament of an X-ray bulb tube.

The technical scheme of the invention is as follows:

a method for prolonging the service life of a filament of an X-ray bulb tube is characterized in that under the condition of the same ray dose, the exposure voltage is kept unchanged, the tube current is reduced, the exposure time is prolonged, and the tube current is reduced by 42.9% -83.3% according to different parts of a body to be detected; or in the range satisfying the radiation dose, the tube current and the exposure time are reduced while the exposure voltage is increased, namely, the product of the tube current and the exposure time is reduced by 50% while the exposure voltage is increased by 15%.

The ray dose is the product of the tube voltage, the tube current and the exposure time.

The reduction amplitude of the tube current is determined according to the thicknesses of different parts of a human body, and the reduction amplitude of the tube current of the part with the thicker part of the human body is smaller than that of the part with the thinner part of the human body.

The invention has the beneficial effects that:

1. the tube current of the X-ray bulb tube exposure is reasonably adjusted to reduce the current of the filament, reduce the temperature of the filament, prolong the service life of the filament of the bulb tube and prolong the service life of the bulb tube.

Detailed Description

The present invention is further described below.

According to the method for prolonging the service life of the filament of the X-ray bulb tube, under the condition of the same ray dose, the exposure voltage is kept unchanged, the tube current is reduced, the exposure time is prolonged, and the tube current is reduced by 42.9% -83.3% according to different parts of a body to be detected; or in the range satisfying the radiation dose, the tube current and the exposure time are reduced while the exposure voltage is increased, namely, the product of the tube current and the exposure time is reduced by 50% while the exposure voltage is increased by 15%.

The ray dose is the product of the tube voltage, the tube current and the exposure time.

The reduction amplitude of the tube current is determined according to the thicknesses of different parts of a human body, and the reduction amplitude of the tube current of the part with the thicker part of the human body is smaller than that of the part with the thinner part of the human body.

The basis for reducing the tube current is to change according to the thickness of the human body, because the thickness of the human body is different, the dosage required to be exposed is different, the dosage required for the thicker parts of the human body, such as the trunk part of the human body, namely the parts of the skull, the cervical vertebra, the chest, the waist, the abdomen, the pelvic cavity and the like, is high, the corresponding exposure milliampere second, namely the product of the tube current and the exposure time is high, therefore, the tube current cannot be reduced too much, if the tube current is reduced too much, the exposure time millisecond is too long, and the human body movement or breathing artifact is easy to appear; the tube current at these thick portions is usually reduced from 800 mA to 300-400 mA at the time of original falling load, the tube current at the thickest lumbar portion is reduced to 400 mA, and the tube current at the skull is reduced to 300 mA.

The dosage required by thinner parts of the human body, such as the four limbs of the human body, namely thighs, calves, arms, palms and the like, is low, the corresponding current of the exposure tube is low, and the tube current can be reduced more. The tube current of the thin parts can be reduced to 100-300 milliamperes from 600 milliamperes when the load is dropped, for example, the thigh part is reduced to 300 milliamperes, and the palm part is reduced to 100 milliamperes.

Taking a 65 kw bulb or a high voltage generator of a digital radiography DR machine as an example, with a constant radiation dose, the reasonable tube currents that can be selected for different parts of the body in relation to a drop load are tabulated in table 1 below.

From the data in table 1, it can be seen that the tube current can be reduced by 42.9% at the minimum and 83.3% at the maximum under different radiation doses.

The following experiments verify that the service life of the X-ray bulb tube can be prolonged by reducing the tube current, and the experiment method 1 comprises the following steps: different constant currents are loaded to the bulb tube filament all the time, so that the filament is always in a high-temperature state until the filament is aged and disconnected. The large focus filament of the X-ray bulb tube is respectively loaded and tested by 6 amperes and 5 amperes current; the small focal filament of the X-ray tube was tested with a current load of 6.5 amps and 5.5 amps, respectively, and the experimental data are shown in table 2.

As can be seen from table 2, the large focus filament current is reduced by about 16.7%, and the life of the filament is extended by about 71.6 times; the small focus filament current is reduced by about 15.4%, and the life of the filament is extended by about 31 times. The current of the filament is reduced, namely the tube current is reduced, so that the service life of the filament can be greatly prolonged, namely the service life of the X-ray bulb tube is prolonged.

Experimental method 2: under the condition of the same exposure voltage, respectively exposing by using tube currents of 1 milliampere and 5 milliampere until the filament is aged and disconnected, and as a result, the service life of the X-ray bulb tube exposed by using the tube current of 1 milliampere to 5 milliampere is 21 times longer; the experimental data are shown in table 3.

The data in table 2 show that the tube current for exposure is reduced, the current of the filament is reduced, and the service life of the filament, that is, the service life of the X-ray tube, can be greatly prolonged.

In summary, the tube current of the exposure of the X-ray tube is reasonably reduced, so that the current of the filament is reduced, the temperature of the filament is reduced, the service life of the filament of the tube can be prolonged, and the service life of the tube is prolonged. When can avoid adopting the load exposure mode that falls, correspond different exposure voltage and always adopt the biggest pipe current to expect to accomplish the exposure in the shortest time, lead the problem of bulb filament that the filament temperature is in maximum temperature, easy loss always.